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Mote ELECTRONICS INC.
SERVICE MANUAL
BTL-301
MODELS sn-20:
VHF FM TRANSCEIVER
7707 RECORDS STREET PRINTED IN U.S.A. PRICE $5.00
INDIANAPOLIS, INDIANA 46226 3-79 SM-10-451
BTL-301 AND BTL-304 SERVICE MANUAL
CONTENTS
SECTION 1 GENERAL INFORMATION
Description
Specifications
Equipment Supplied
Equipment not Supplied
Installation
Operation
Crystal Specifications
Crystal Installation
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SECTION 2 CIRCUIT DESCRIPTIONS
1 Receiver Board
-2 Transmitter Board
3 Crystal Switching
-4 LED Display Board
5 Receiver Block Diagram
-6 Transmitter Block Diagram
SECTION 3 ALIGNMENT AND TUNING PROCEDURES
Equipment Required - Receiver Alignment
Quadrature Detector Alignment
IF Alignment
RF (Receiver) Alignment
Noise Balance Adjustment
Equipment Required - Transmitter Alignment
Transmitter Tuning Procedure
Crystal Netting Procedure
Deviation and Mike Gain Adjustment
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SECTION 4 DIAGRAMS, VOLTAGE DATA AND SCHEMATICS
1 Receiver Board Parts Placement Diagram
2 Receiver Board Bottom View
3 LED Display Boards Parts Placement Diagram
4 LED Display Boards Bottom View
-5 Transmitter Board Parts Placement Diagram
6 Transmitter Board Bottom View
7 Transmitter Board Tune-Up Test Points
8 Voltage Data and Semiconductor Location Diagram
9 Crystal Location and Adjustment Diagram
-10 Schematic with Voltages (BTL-30l)
-ll Schematic with Voltages (BTL-304)
BTL-301 & BTL-304
SECTION 5 PARTS LIST
5-1 Receiver Board
5-2 Transmitter Board
0-3 LED Display Board (BTL-30l)
5-4
9-9
LED Display Board (BT L-304)
Chassis Assembly
SECTION 6 SERVICE MANUAL ADDENDUM
Text revisions
Component revisions to Transmitter Board 500-996
Transmitter Block Diagram
Transmitter Board Parts Placement Diagram
Transmitter Board Parts Overlay Diagram
-6 Power Regulator Board Parts Placement Diagram
7 Power Regulator Board Parts Overlay Diagram
8 Power Regulator Board Parts List
9 Schematic with Voltages (BTL-301)
10 Schematic with Voltages (BTL-304)
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SECTION 7 SERVICE MANUAL ADDENDUM ©
7-1 Text Revisions
7-2 Component Revision to Transmitter Board 500-996
7-3 Transmitter Board Parts Placement Diagram
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7-4 Transmitter Board Parts Overlay Diagram
9 Schematic with Voltages (BTL-301)
-6 Schematic with Voltages (BTL-304)
SECTION 8 SERVICE MANUAL ADDENDUM
8-1 Cross Reference To Power Regulator Board
8-2 Component List To Transmitter Board
8-3 Transmitter Board Parts Placement Diagram
8-4 Transmitter Board Parts Overlay Diagram
8-5 Receiver Board Parts Placement Diagram
8-6 Receiver Board Parts Overlay Diagram
8-7 Schematic with Voltages (BTL-301/304)
BTL-301 & BTL-304
SECTION 9 SERVICE MANUAL ADDENDUM
9-1 Component List Plus Cross Reference
9-2 Relay Board Parts Placement Diagram
9-3 Relay Board Bottom View
SECTION 10 C.T.C,S.S. ACCESSORY ADDENDUM
10-1 Circuit Description
10-2 Adjustment Procedure
10-3 Specifications
10-4 Voltage Chart
10-5 Schematic
10-6 Tone Option Board Parts Placement Diagram
10-7 Tone Option Board Bottom View
10-8 Component List
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SECTION 1 GENERAL INFORMATION
1-1 DESCRIPTION
The Regency BTL-301 and BT L-304 are all-transistor, FM transceivers
designed for use in the VHF (29-50 MHz) Communications Low Band. The
BTL-301 and BI L-304 are, respectively, one and four channel versions of
the same basic transceiver design. The transmitter and receiver sections
both employ band-pass circuitry for maximum RF power output and receiver
sensitivity. Receive and Transmit frequencies are both crystal controlled.
The receiver section is a double-conversion, super -hetrodyne type with
a MOS FET first mixer. Silicon transistors are utilized for dependability
under widely varying ambient conditions. Also, two Integrated Circuits are
used, providing for compactness and circuit reliability. In addition, a ceram -
ic filter is employed in the second I.F. for optimizing receiving performance
where numerous channels are active within the same area of the country.
The transmitter section also utilizes silicon transistors throughout. Two
ruggedized RF power transistors (BET or Balanced Emitter transistor type)
are employed for high power output (30 watts). A large, copper heat sink en-
sures that there is virtually no power drop off during lengthy transmissions.
In addition, an SWR bridge limiting circuit provides the necessary protection
to the RF power transistors in the event the antenna or its coaxial feedline
becomes open or shorted.
The transmitter employs phase modulation for the ultimate in carrier
stability. Internal controls are provided for adjusting the microphone gain
and for setting the amount of deviation. The deviation control is adjusted for
a maximum of 5 KHz deviation, in conformance with FCC Regulations.
The attenuation of spurious emissions from the transmitter, RF power out-
put frequency stability, performance under highly varying conditions of temper -
ature and battery voltage, and other specifications, all exceed the limits required
for Type Acceptance by the Federal Communications Commission.
NOTE: The Regency Type BI L-301 and BIL-304 Transmitters are Type
Accepted undex Parts 21, 89, 91 and 93 of the Federal Communi-
cations Commissions Rules and Regulations. The receiver sec -
tion is Certified under Part 15, Subpart C as required by the FCC
Rules and Regulations.
1-2 SPECIFICATIONS
RECEIVER
Aina pod Aalce v/s KMMEMRe te Lh ae ee dete ese eee gees 90 ohms
BTL-301 & BTL-304 oil at SECTION 1
Channels’ <2 < jee vic and os fo nye gees eer ce omnes 1 Crystal Controlled (BTL-.
4 Crystal Controlled (BTL-3
Frequency Range soc’. a2 nee 24 0 kl wekeke witie Prairie cy ae 29-50 M
Factory Tuned In 3 Segments....... 20. e eee cece eee e meee eees 29 3 SM)
35-44 MI
44-50 MI
Sensitivitys PPOs, SEI a Pa a Panectee rae 0.35uv 20 DB Quieting Nominz
Selectivity, SING . MR TIAy Smee, 25ers 6 DB £7 to-KHa3)-70:DBit19. hi
Spurious "Rejection? A) PFAPNE WAT. GEE. a EMMA I atAE ed teria ire he ey ion a neh 60 DI
Intermodulation Rejection’ WT Re, Met a. 1 RIA Rie eure 60 DB
Modulation Acceptance: is:. ams ais eter tcer on here ae Cores nienen ties: ete tas aoe 7 50° Kia
Audio Output 97 OfeR 2a" Soares dere een ae 3 Watts 10%, or less, Distortion
5 Watts Maximum
Squelch’ System MAP er etrk, PRRs ee a rok onene ort meme All Noise Compensated
De OV SCC ea olateait- ee rerto estes Double Conversion 10.7 MHz — 455 KHz &
Part 15 FCC Certified as follows:
Frequency Range Receiver Certification No.
29-35 MHz RL I4A
35-44 MHz RL 14B
44-50 MHz RL 14C
TRANSMITTER
Antenna [Impedance sino eae ahee© ipa ey ci genens <atonen te ucusiver so nete Lecs ne 90 ohms
CHSMMEIG oo ois. dso auaiene a apege fs ees ene eee ee 1 Crystal Controlled (BT L-301)
4 Crystal Controlled (BT L-304)
Frequency Ranges. 4. 40 si. aia elec an oe ele tease tere rere iene heen 29-50 MHz
Factory Tune Ranges (7). <6 sccinn 0% 5 eile ole elon oe oe) oie epee 29-32 MHz
32-35 MHz
35-38 MHz
38-41 MHz
41-44 MHz ¢
44-47 MHz :
47-50 MHz
BTL-301 & BTL-304 = SECTION 1
LOW OMOLMP UL a rae ls Ii RVR TREE ead eek ne 3 30 Watts (minimum) at 13.8 VDC
Howes: Bandwidth fone, A) das Gee srs acted li, 1.0 MHz Maximum
Quipu@Erequency Stability saa Inas.Uaw. watery: 0.002%, -30 to +60°C
SDUSTOUS AMARA LMNONIC# Rh CrCCMONIE 5 Hm x sa $0 S06 es He vo 00 so de ve we 5) wed en Wo 1 Wet 98 DB (min.)
PowerUnitthrotection wire ie paoeer iy ad need. loc. VSWR Bridge Limiting
Protection Circuit
TTS SE LOTIE GRE cm RW fe Go Re ERIE RE RAs we 6-8 Wats, tote tore teste tof fo tv too te toners SNe ITE TIL | 16F3
MAKEIRTeSATIpea. eh Oates nk. eee: FET Input with Internal Level Control
WIL CEO DOIG i. Meare MmeaRE Wee tena e na, Gehel's. say dos High Impedance Plug-in Ceramic
Modulation tensery tern te ss iy... 22rd Ma. 3.2 Tae at Phase Modulation with
Automatic Deviation Limiting
DEVicitOn haa tarmemtties e455 eo ae wd oes Factory Adjusted to +5 KHz (max.)
HCAS MIE Ee Met, SPE keke kee e ene os Oe ees Solid Copper 1/8" Thick
iypesAcceptances 215 92.915 93
POWER
Powel Rh @cuwiGementcns tictes cals ske:4s c/a 4s ROI Fee 13.8 Volts (nominal)
RECCIVe: (SCUCICH Ed) spre asa yeicice- nies sve s BABWRIS atin, aletol 180 MA.
Pecciven (Max Audio Output). . a... ss... SRE a. Mao) reed 800 MA.
Aig MERCH NAPUS Eile ar ae Fee ee A ee ne Wentmns (max,
EN UTER RASS Behe hn ES SP See oO oO a ee IG Amp G
SEMICONDUCTORS
iMtec rated Cin cults ne mee erneloorn. viisiaa2. Mii bosu) Mack bell~ 4.2: 3
SrlicOnel (ale Solon hota) sete celle cist ool cicuEs uses ce kat % 4 bias ticccele sack outta 25
SLliconiBhiMPower WU ransistons wrt, Bao veer est ei ahh kee le Le Syl, 2
Dual GatemiOsiand ditansiston, Ot Oy Pe oSuto, 8 I... TAiOn. Sew, 2a: 1
BTL-301 & BTL-304 =o SECTION 1
Fiél@ Effect. Trarvisistaren).2 2 De: <4 de celeesas cee 6 0a 6 54 ool ee v
Zenerdoiodessilt. O. base une ca. b wes Sasa epee see 5 6 84-0 be 9 teeeE ee Reee Rn 2
Varitap- Diodes © 2008 20 o speceicce comps commaes on sp yanrhtneseseien® Alp es «Pe ee eee ae 2
Signal DIGdES A. ...eansdwchar pus ewok new an pw eth ebien aren More 5: (BT L-301)
8 (BT L-304)
Rectifier Diddesweth «sk ek de wia le ofa ace eae ne bck ole ols aeele nanan tar ies tekken 1
LighmEmitting Diodes... cosas eeyeererr rer ieee ae eee ee 2 (BLL -301)
5 (BT L-304)
SENERAL FEATURES
Front Panel SiZe. oe oc re one ok ees ieee RENE aca cte-t he ues eee es ee 25 / SR Gry 2
Depthi(including Knobs it enw. oes se ccs lla «lew ete = eiaierereirea OZ.
Weight(Comipléte a tacre SA. EOE Toe. ee es ee eee es Ol /zase
Speaker. f pace. Site: «aly a 5 are re alee eras 4"" Square, 3.22 Impedance
1-3 EQUIPMENT SUPPLIED
- Transceiver unit
- Microphone and Connector
- Mobile Mounting Bracket
- Mobile Mounting Hardware
- Security Bracket
- DC Power Cord and Fuse
- Owner's Instruction Manual
memeoennyse®
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1-4 EQUIPMENT NOT SUPPLIED
1 - Antenna
1 - Coaxial Cable feedline
1 - Coaxial Cable connector
1 - Power Supply (battery)
1 - Pad lock (used with Security Bracket)
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1-5 INSTALLATION
The BIT L-301 and BTL-304 transceivers are designed for installation
in a vehicle that has a 12 VDC negative ground system. The RED lead,
with the fuse holder, must be connected to the positive (+) terminal side
BTL-301 & BTL-304 —4-— SECTION 1
of the battery. The BLACK lead should be connected to the negative
terminal of the battery, or to a metal chassis that is grounded to the
negative terminal. In the event that the battery is remotely located, it
may be necessary to install additional wires for properly connecting the
radio to the battery's terminals.
The antenna used should be properly adjusted for the 50 ohm output of
the transmitter. A high SWR will reduce the power out, or may even shut
off the transmitter entirely.
To reduce the possibility of theft, the Security Bracket should be in-
stalled as shown in Figure 1-1. The padlock used should be of substantial
construction and can be either a key or combination operated type.
An external (or remotely mounted) speaker can be used by first opening
the link between terminais No. 2 and No. 3. Then, connect one lead of
external speaker to terminal No. 1 (chassis ground) and the other lead to
terminal No. 3. The use of a 3 to 4 ohm speaker is recommended for
optimum performance.
1-6 OPERATION
Volume Control/Off-On Switch:
This control varies the audio output level for the internal speaker. It
also varies the level of audio present at the external speaker connection.
Clockwise rotation of this control turns the receiver on and increases the
volume.
Squelch Control:
This control eliminates background noise in the absence of a signal.
Full clockwise rotation removes all squelch action. Turning this control
counter -clockwise until the noise disappears permits the receiver to be
“quiet” until an actual signal is received. Even if the squelch control is
set fully counter -clockwise, the receive will still operate properly and
will not be locked-out or prevented from receiving a signal.
BTL-304 Channel Selector Buttons:
The BIT'L-304 is capable of two-way communications on any one of four
discrete, crystal-controlled frequencies, or channels. Selection of the de-
sired channel is accomplished by pressing the corresponding channel selec -
tor button on the front panel of the unit. The radio will neither receive nor
transmit unless one of these buttons is depressed so that a channel indicator
lamp is on.
NOTE: Do NOT push more than one channel selector switch button in
a trastiine,
BTL-301 & BTL-304 —5— SECTION 1
Indicator Lamp:
BTL-301: Two LED's (Light Emitting Diode) are located on the front panel
of the unit. The LED labeled "POWER" functions as a pilot lamp
indicating whether the unit is turned on or off. The LED labeled
"TRANS" is a transmit indicator which glows red whenever the
transmitter is keyed on (activated).
BTL-304: Above each channel selector button is a LED which glows whenever
its corresponding channel button is pressed. These lamps make it
easy to tell at a glance which channel has been selected and to also
verify that the radio is turned on. The remaining LED is a Transmit
Indicator which glows whenever the transmitter is keyed on.
Microphone:
A high impedance ceramic microphone is supplied with the unit. To
install the microphone on the radio set, insert the connector plug into its
socket with the locating tab toward the radio. The connector is then locked
into place by rotating the locking ring 1/4 turn clockwise.
To transmit a message, it is only necessary to turn the radio set on,
press the push-to-talk button on the microphone and speak into the micro-
phone. The Transmit Indicator will come on to signify that the transmitter
is operating.
Best results are obtained by holding the microphone about one inch from
the lips, inclined at about a 30 degree angle away from the face. Speak
clearly in a normal tone of voice across the face of the microphone.
1-7 CRYSTAL SPECIFICATIONS
Minature plug-in crystals are utilized by both the receiver and trans -
mitter sections.
The following Regency Part Number crystals are used:
Receive Crystals: 302 -031
Transmit Crystals: 302 -075
Crystals should be ordered by specifying the above part numbers and
the exact channel frequency required.
1-8 CRYSTAL INSTALLATION
Prior to installing a crystal, the transceiver's cover will have to be
removed. ‘To remove this cover, unscrew the two large bolts located at the
sides of the unit. The cover may then be slipped off by sliding it toward
the rear of the unit.
BTL-301 & BTL-304 —6— SECTION 1
Next, the speaker should be removed. Unscrew the two small metal
screws (one located on each side) holding the speaker mounting brackets
in place. Then carefully place the speaker assembly along side of the unit.
Insert the crystal, or crystals, in the proper socket pins as indicated
on the Crystal Location Diagram, 4-9. The number by each pair of sockets
matches the channel designation that appears on the front panel (BTL-304
ONLY).
For each TRANSMIT crystal, there is a variable capacitor that is to be
used for "Netting" (adjusting to the exact frequency) each transmit crystal.
This netting should be made with an accurate frequency counter.
NOTE: FCC Regulations require that the TRANSMIT crystal be
installed and adjusted ''on frequency'"' under the super -
vision of a technician holding either a First or Second
Class FCC license.
After all crystals are installed, and netted, reinstall the speaker
assembly. Then carefully reinstall the cover and its hardware.
BTL-301 & BTL-304 == SECTION 1
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SECTION 2 CIRCUIT DESCRIPTIONS
2-1 RECEIVER BOARD
The entire receiver from RF through audio output circuitry is mounted on
the one receiver circuit board. The antenna is connected to an RF Bandpass
Filter which acts as a preselector for incoming signals. The bandwidth of this
filter is approximately 1 MHz, and consequently, the filter (L101, L102, L103)
must be tuned to the portion of the band being used.
Q101 is a Dual Gate MOS FET mixer. The output of the RF Bandpass Filter
is coupled to Gate 2, while the L.O. (local oscillator) output is injected into Gate
1. The output of QI101 is at the 10.7 MHz, First 1.F. frequency. The gain of this
stage is high enough that no RF preamplifier is needed to achieve good sensitivity.
The first L.O. (local oscillator), uses third overtone crystals. (The number
marked on the crystal is the channel frequency). Oscillator injection to the mixer
is accomplished by coupling the oscillator output to a tuned circuit on Gate | of
the mixer.
The 10.7 MHz output frequency from the FET mixer is selected by T10l.
This output is amplified by Q103, a J-FET amplifier, and fed to an integrated
circuit, IC101, which contains another amplifier for 10.7 MHz, the second mixer
circuitry and the second L.O. circuitry, operating at 10.245 MHz. In some lo-
cations where a strong Image Signal has been encountered, this oscillator's fre-
quency is moved to 11.155 MHz. (The crystal frequency is stamped on the top of
the crystal).
The 455 KHz output of IC101 (terminal 5) is coupled through a tuned circuit to
the input of the ceramic filter, CF-l. CF-l is a narrow-band filter centered at
455 KHz. The excellent bandpass characteristics of CF -l provide for very good
adjacent channel rejection. The output of CF-l is amplified by Ql104 and coupled
through another tuned circuit to the input of integrated circuit IC102. ICl02 isa
series of amplifiers providing approximately 60 DB gain at 455 KHz. Also in-
cluded in IC102 is the limiting circuitry and a quadrature detector circuit. L108,
connected between terminals 2 and 12 of IC102, is the adjustable quadrature coil.
The audio output from IC102 (terminal 1) is coupled to the input of the audio
amplifier circuit and to the input of the noise-operated squelch circuit.
Transistor Q105 is an amplifier whose frequency response extends from ap-
proximately 5 KHz to 25 KHz. QI105 amplifies the "noise" occuring in this fre -
quency range. The noise is coupled to the base of Q106. QI06 is used as a de -
tector which rectifies the amplified noise and produces a DC voltage at its col-
lector. When the DC voltage at the collector of Q106 is positive and of sufficient
value to provide base bias for Q107, QIO7 turns off and provides essentially a
short circuit between the base of Q108 and ground. This action turns off Q108
BTL-301 & BTL-304 ed le SECTION 2
and the audio output from the receiver is squelched (muted). When a signal
(carrier) arrives, the noise input to the detector (Q106) is reduced to the point
where the DC voltage at the base of QIO7 is no longer sufficient to cause Q107
to conduct.
At this time, Q108 is allowed to conduct normally and the audio output of
the unit is heard. With the audio preamplifier, (Q108) operating normally,
audio is applied through the volume control to the base of the audio amplifier ,
Q109. Q109 supplies a signal to the audio driver transistors, QUO and Qlll.
The output transistors, Ql12 and Ql13, form a quasi-complementary, trans -
formerless stage capable of delivering 5 watts to the speaker.
2-2 TRANSMITTER BOARD
AUDIO SECTION
The audio amplifiers, Q201 and Q202, provide a high impedance input for
the ceramic microphone supplied with the input and provides adjustable gain
to compensate for variations in microphone characteristics. A low pass filter
at the input rejects interference above the normal speech band limit of 3000 Hz.
The Q202 circuitry is designed to provide a high output impedance for driving
the modulation limiter circuit.
The clipper circuit (CR201 and CR202) allows signals whose amplitude is
below the diodes' forward conduction threshold to pass undistorted. The peaks
of large signals, however, drive the diodes into conduction where their expo-
nential characteristic effectively limits the voltage of the signal peaks while
shunting the peak currents to ground.
Q203 amplifies the output of the clipper circuit and drives the modulator
circuit. Two low pass filters, one at the input of Q203 and one at the output,
remove the harmonics generated by signal clipping in the Modulation Limiter
circuit so that the Authorized Bandwidth is not exceeded at maximum deviation.
The audio frequency response of this section meets or exceeds FCC require -
ments.
The deviation control (R216) in the collector circuit of Q203 sets the level
of the audio signal voltage applied to the Varactor diode modulator circuit.
This level is adjusted for a maximum of 5 KHz deviation with the clippers
driven to full clip by a 400 Hz audio signal.
The push-to-talk (PTT) switch in the microphone applies a ground to the
transmit-receive relay coil, which activates the relay. The T-R relay switches
the supply voltage between the receiver and transmitter and switches the antenna
between the receiver input and the transmitter output.
BTL-301 & BTL-304 —2— SECTION 2
CRYSTAL OSCILLATOR
The Oscillator Q212 is a common collector, modified colpitts type, whose
frequency is determined by one of four crystals selected by the channel selector
Switch. Each crystal has an associated trimmer capacitor which is used for
fine frequency adjustment. When used with the specified crystal type, the os -
cillator meets the required frequency stability without need for crystal ovens or
external compensation. The primary supply voltage to the oscillator is regulated.
DIVIDER
The Divider (IC201) is a digital frequency divider which divides the output
frequency of the oscillator by four (4). The purpose of the Divider is to allow
both the Oscillator and the Modulator to operate at their optimum frequencies.
MODULATOR
A varactor, phase-modulator is used.
The modulator, consisting of L206, CR205, CR204 and associated circuitry,
is an anti-resonant circuit tuned to one-fourth the oscillator frequency. The
Square wave output of the Divider is lightly coupled to the Modulator by C241.
The harmonics of this output are rejected by the selectivity of the modulator
circuit so that the output of the modulator consists only of the fundamental
plus modulation sidebands. By varying the voltage on the two varactor diodes,
CR205 and CR204, at an audio rate, the resonant frequency and consequently
the phase shift of the modulator, is varied which results in the Divider output
being phase -modulated at the audio frequency. The phase modulator stage
modulates with low distortion over a small phase angle. The frequency mul-
tiplier stages, which follow, increase both the frequency and the deviation to
the desired value.
FREQUENCY MULTIPLIER SECTION
The Divider frequency (approximately 3 MHz), is multiplied by sixteen (16)
in the multiplier section to form the carrier output frequency. The multiplier
string is as follows: Q2l1l, Doubler; Q209, Doubler; Q207, Doubler; and Q206,
Doubler. A double tuned, inductively coupled circuit at the output of each mul-
tiplier stage selects the desired harmonic and provides for impedance matching
between stages.
POWER OUTPUT SECTION
a. Driver and Power Amplifier
The Driver (Q205) and Power Amplifier (Q204) stages amplify the
carrier signal to the required output power. Additional selectivity
BTL-301 & BTL-304 oe SECTION 2
against spurious emissions is provided in T202... These. stages: op.-
erate in the Class C mode.
b. Output Matching Network
L201, L202, C217, C218, C219 and C252 make up an output "Il"
matching network which transforms the output impedance of Q204 to
a 502 resistive match at the antenna terminals. This circuit also
provides selectivity which attenuates the harmonics of the carrier
to below the level required by the FCC. C252 and L202 form a trap
which provides additional rejection of the second harmonic. No addi-
tional low pass filter is necessary. L203 is an R.F. choke which
isolates the R.F. output of Q204 from the D.C. supply buss.
ci) S'SWRiBridge
In the event of a load mismatch at the antenna terminals, the SWR
Bridge consisting of T201, R218 and CR 203 will detect the mismatch
and send a signal to the Driver Limiter. The Driver Limiter (Q208
and Q210) will then bias Q209 in an off condition, preventing possible
damage to the power amplifier (Q204). Load mismatch is detected by
comparing the phases of output voltage and current to determine if
standing waves exist on the line.
2-3 CRYSTAL SWITCHING
The Receiver board on the BTL-304 contains a diode switching matrix which
enables the push button frequency select switch to remotely control the receive
channel selected by switching a DC current only. When channel one is selected
by depressing the Fl button on the front of the unit, SWIB applies a ground to R149,
causing CR104 to conduct in the forward direction. Y101 is thus "switched in"
through the low forward resistance of CR104. When SWIB is closed, interlocked
switches SW2B through SW4B are open, causing CR105 through CR107 to be reverse
biased. The high reverse resistance of these reverse biased diodes "switches out"
their associated crystals. The transmitter crystals are directly switched by the
"A" section of these switches (SWIA through SW4A).
2-4 LED DISPLAY BOARD
Channel Indicator (BTL-304): | LD301 through LD304 function as channel in-
dicators. When a channel selector switch
button is depressed, the associated receive
crystal switching contact closes, as explained
in 2-2 above, grounding the cathode of the LED
indicator for that channel. The LED then con-
ducts current in the forward direction and emits
a red glow. The other LED's whose switches
BTL-301 & BTL-304 4-— SECTION 2
ww
Transmit & Power Indicators:
BTL-301 & BTL-304
are open, are reverse biased and conduct no
CUBrENT.
The Power Indicator (BTL-301) and Transmit
Indicator function similarly, except that the
cathodes are grounded, and voltage to the LED's
are provided, respectively, by the radio's pri-
mary power and the transmitter's supply voltage.
ee SECTION 2
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2-5 RECEIVER BLOCK DIAGRAM
SECTION 2
BTL-301 & BTL-304
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2
SECTION 2
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a SECTION 3 ALIGNMENT AND TUNING PROCEDURES
3-1 EQUIPMENT REQUIRED—RECEIVER ALIGNMENT
3-1-1 FM Signal Generator
3-1-2 Oscilloscope
3 =] -359eAGRVIIVM
3-1-4 Noise Generator (to be used in 3-5 only)
NOTE: During all steps of alignment, the squelch control should be in the
clockwise position (minimum squelch action).
All transceivers should be aligned to the channel nearest the center
of the frequency range over which they will operate.
Diagrams 4-l and 4-2 show the location of all coils to be adjusted.
3-2 QUADRATURE DETECTOR ALIGNMENT
3-2-1 Connect the FM Signal Generator to the antenna input jack. Accurately
set frequency to the center of the channel being used for alignment.
Modulate Signal Generator with 1000 Hz, 3 KHz deviation.
3-2-2 Connect the oscilloscope to Test Point A, (Junction of C139, C140,
R129). See diagram 4-2.
3-2-3 Adjust output of Signal Generator until all noise in scope pattern just
disappears.
3-2-4 Adjust L108 for maximum peak to peak amplitude, while maintaining
symmetry of the detected signal. When L103 is properly aligned,
signal should be approximately 0.2 volts RMS with test signal input
as noted in 3-2-1.
3-3 IF ALIGNMENT
3-3-1 Disconnect RF Signal Generator from antenna input.
3-3-2 Connect AC voltmeter across speaker terminals.
3-3-3 Adjust volume control for 0.5 volt noise reading on AC voltmeter.
3-3-4 Peak T102 (bottom core and top core, in that order) for maximum noise
(maximum meter reading on AC voltmeter). If circuit is not badly mis-
aligned, the correct point should be within 2 turns of the cores' present
y position.
BTL-301 & BTL-304 ==) SECTION 3
NOTE:
S=37O
O73 0
S=3-7
370-0
BIS Few
NOTE:
3-3-10
ooo
Coil will have two peaks; adjust core to peak away from the
center of form.
Adjust volume control for 1.0 volt noise reading on AC voltmeter.
Connect the R.F. Signal Generator to the antenna input jack. Turn
modulation off. Set the generator to the operating crystal frequency.
Adjust the Signal Generator output until the voltmeter reads 0.2 volts.
Adjust T101 (top core) and T101 (bottom core), for maximum quieting
(lowest meter reading). Adjust Signal Generator to maintain reading
on AC voltmeter between 0.1 and 0.2 volts. If two peaks occur, use
the one away from the center of the coil form.
Set the generator frequency to the secondary image frequency. This
is 910 KHz ABOVE the channel frequency.
Some receivers may have the second oscillator at 11.155 MHz, if this
is the case, the image frequency is 910 KHz BELOW the channel fre-
quency. Check the frequency marked on top of the crystal (10.245
MHz for above and 11.155 MHz for below).
Adjust the Signal Generator output until voltmeter reads 0.2 volts.
Adjust T102 (bottom core), T102 (top core), T101 (bottom core) and
T101 (top core) (in that order) for maximum quieting degradation
(highest meter reading). Adjust Signal Generator output to main-
tian voltmeter reading between 0.1 and 0.2 volts. The correct
position for the cores should be within two turns of the position in
step No. 4 and 8.
3-4 RF (RECEIVER) ALIGNMENT
3-4-1
3-4-2
374-3
3-4-4
Ber tae)
Pre-set L104 flush with top of coil form.
Connect AC voltmeter across the speaker terminals.
With nothing connected to the antenna input, adjust the volume con-
trol until AC voltmeter reads 1 volt of noise.
Connect Signal Generator to antenna input jack. Set generator accu-
urately to the center frequency of the channel being used for alignment.
Turn modulation off.
Adjust output of Signal Generator until AC voltmeter reads 0.2 volts.
BTL-301 & BTL-304 =2— SECTION 3
3-4-6 Adjust L101, L102 and L103, in that order, for maximum quieting
(lowest meter reading). Adjust Signal Generator output to maintain
voltmeter reading between 0.1 and 0.2 volts. Repeat adjustments
until no further improvement can be made. If two peaks occur on
any core, use the peak with the core nearest the top of the coil form.
3-4-7 Adjust L104 for maximum quieting (lowest meter reading). Adjust
Signal Generator to maintain reading on AC voltmeter between 0.1
and 0.2 volts. If two peaks occur, use the one away from center of
the coil form.
3-5 NOISE BALANCE ADJUSTMENT
NOTE: This adjustment may be required only if excessive "ignition noise”
is encountered. Usually, the noise problem is caused by improper
or inadequate noise suppression of the vehicle's ignition system.
3-5-1 Using a ''T" connector, connect the FM Signal Generator and the
Noise Generator to the Antenna input jack. Ifa "T"' connector is
not available, connect the FM generator to the antenna jack and
feed in the noise signal by means of a 3 or 4 turn loop coupled to
the input coil, LIOl.
3-5-2 Connect the oscilloscope to the junction of Ql12 emitter and QU3
collector, or to the speaker terminals.
3-5-3 Apply a 3 to 10 microvolt signal, as accurately as can be set to the
exact channel frequency (carrier only, no modulation), and adjust
the output of the noise generator until spikes are clearly seen in the
audio output as viewed on the oscilloscope. The noise spikes will be
either mostly positive or negative if an unbalanced condition exsists.
3-5-4 Tune L108 (Quadrature Detector Coil) until the noise spikes are equally
positive and negative in their amplitude. The overall amplitude of
these spikes should be much less as a balance is achieved. Usually,
only a 1/4 turn, or less, is needed to obtain the proper adjustment
for best noise balance. If a proper balance can not be achieved, re-
peat the IF and RF alignments and then try the noise balance adjustment
again.
3-6 EQUIPMENT REQUIRED—TRANSMITTER ALIGNMENT
3-6-1 RF Wattmeter (or any equivalent device which provides a 50 ohm
load at the appropriate power range).
3-6-2 Frequency Counter - 50 MHz required.
BTL-301 & BTL-304 =3— SECTION 3
3.76:-3
3-6 -4
3-079
3-6-6
FM Modulation Meter - Lampkin 205A or equivalent peak reading
- deviation meter.
Audio Generator — HP 200D or equivalent.
VTIVM (See 3-7-4 below).
Oscilloscope
3-7 TRANSMITTER TUNING PROCEDURE
NOTE:
o-Ack
tes hey
Sad ae
The encircled numbers on diagram 4-7 correspond to the last digit
in the following procedure steps. The unit must be connected to a
suitable 502 load for proper alignment of the final transmitter stage.
Install crystals. For full bandwidth alignment, a center tune -up
crystal must be used. Alignment is done on the center tune -up fre-
quency and then the bandwidth is checked using the high and low crys -
tals. The total maximum bandwidth for Transmitter operation is 1.0
MHz (500 KHz above and 500 KHz below the tune -up frequency).
Because of the extremely wide frequency range over which this trans -
mitter is required to operate (29-50 MHz), it has been necessary to
divide the frequency band into seven sub-bands, each 3 MHz wide. Each
sub-band has its own set of tuning capacitors, which are listed in a table
on the schematic diagram. The table also shows the change in L202
and L206 between the high and low portions of the band.
By dividing the band into seven small segments instead of the usual
two or three large ones, it has been possible to provide the tuned cir -
cuits with the correct L-to-C ratio and circuit "Q" for optimum operation
at all frequencies. In this manner the compromises necessary to achieve
wide tuning range have been eliminated.
Tighten trimmer capacitors C217 and C218 to maximum clockwise pos -
ition (maximum capacitance).
Loosen trimmer capacitor C252 to near minimum capacitance (counter -
clockwise).
The adjustment of C252 need only be made once and is not affected
by the other adjustments in the Output Matching Network mor by
changing to another frequency in the sub-band. Consequently, if the
transmitter has ever been aligned before, it will not be necessary to
re-adjust C252 and all steps pertaining to this adjustment in the follow-
ing paragraphs should be omitted. This adjustment is normally made
at the factory near the center of the sub-band and then sealed.
BTL-301 & BTL-304 oh arr SECTION 3
3-7-4
B19
3-7-6
Oe]
Set warping capacitors C246, C248, C250 and C252 to mid-range
capacitance (1/2 open).
In the following procedure, key the transmitter momentarily, while
each adjustment is being made. Do not leave in a continuously keyed
state until alignment is complete.
Required equipments are a 50 ohm resistive load termination rated
at 50 watts or more, an RF wattmeter, and a VTVM in which the ref-
erence (ground or common) lead can be ''floated" above ground (a
Battery Powered unit or an AC Powered unit with the ''common" isolated
from chassis ground).
Oscillator Check
a. Connect the probe of the VIVM to the Emitter of Q212 (common
connected to ground).
b. If the oscillator is running, the voltage at this point will be about
1.7 VDC. If it is not running, the voltage will be about 1.3 VDC.
Modulator Alignment
a. Connect the common lead of the VITVM to the A+ buss in the trans -
mitten (junction of R237, R231, etc).
b. Connect the probe of the VIVM to the junction of R237 and T206.
Short this point to the collector of Q21l with a jumper.
c. Tune the core of L206 for peak on the VITVM (maximum voltage
drop across R237). Normal voltage is -0.8 volts.
d. Remove the jumper.
T206: The common lead of the VT VM is left connected to the A+ buss
during the remainder of the alignment. Before proceeding, back all of
the bottom cores of transformers T202 through T206 until the cores are
flush with the bottom of the P.C. board. Connect the VI VM probe to the
junction of R231 and T205. Connect a jumper between this point and the
collector of Q209. Tune the primary (top core) of T206 for a peak read -
ing on the VITVM (max. voltage drop across R231), and then adjust the
bottom core of T206 for a peak reading. Normal voltage is -1.8 volts.
Remove the jumper. In adjusting T203 through T206, the secondary
(top core) is first peaked with the primary (bottom core) backed out of
its winding, and then the primary is tuned. The secondary is not to be
readjusted after the primary is tuned.
BTL-301 & BTL-304 aa Ome SECTION 3
3-7-8 T205: Connect the VT'VM probe to the junction of R225 and T204. Jumper
this point to the collector of Q207. Adjust the secondary core and then the
primary core for a peak reading on the VIVM as in 5a. above. Remove
the jumper. Normal voltage is -3.5 volts.
3-7-9 1204: Connect the VI'VM probe to the junction of R223 and T203. Jumper
this point to the collector of Q206. Adjust the secondary core and then
the primary core for a peak reading as in 5a. above. Remove the jumper.
Normal voltage is -l1.2 volts.
3-7-10 1T203: Connect the VI VM probe to the junction of R220 and T302. Jumper
this point to the collector of Q205. Adjust the secondary and primary cores
of T203 as in 5a. above, then remove the jumper. Normal voltage is -1.0
volts.
3-7-11 T202: Adjust the primary (bottom core) of T202 for a-dip in the reading
of the VITVM. Then adjust both primary and secondary cores for max-
imum RF power output as indicated on the voltmeter.
3-7-12 Power Amplifier Alignment
BTL-301 & BTL-304
The following adjustments are peaked in the order listed for maximum
power output as indicated on the R.F. wattmeter.
Hy MGE2I18
~). C217
.) T202, primary & secondary
.) Repeat.the above three steps until no
further improvement is noted.
Bm wN
Second Harmonic Trap Adjustment: C252 is adjusted for minimum
second harmonic output as observed by a spectrum analyzer or other
means. Repeak C217 and C218 for maximum power out. Repeat
these three steps until no further improvement is noted. Once aligned
at one frequency, the second harmonic trap need not be re-aligned for
other frequencies within the same sub-band.
Check power output on all the crystals installed in the BTL-304. Adjust
T202 for the best compromise in RF power output between the highest
and lowest channels. Minimum rated power output is 30 watts ata
13.8 VDC.
It is desirable, during Power Amplifier Alignment, to place the unit,
especially the transmitter section, on a sheet of steel to simulate the
presence of the unit's cover. This sheet should be large enough so
that it completely covers the bottom of the transmitter board and
protrudes beyond the chassis on both sides. Do not permit this
sheet to touch any part protruding below the transmitter board.
eo SECTION 3
5
’)
3-8 CRYSTAL NETTING PROCEDURE
NOTE:
a0]
3-8-2
3-8 -3
3-8 -4
B60 -0
The following procedures must be performed with the radio set ata
temperature of 70 to 80°F. The frequency of each channel must be set
to within +.0001% of the assigned channel frequency.
Connect the unit to the RF wattmeter or dummy load.
Turn transmitter on (key the mike's PTT switch or ground pin No. 1
of J2).
Place an RF pick-up loop consisting of 3 or 4 turns near the final
transistor's output circuit (near L201; See diagram 4-5).
Read the frequency on the counter.
Adjust the appropriate netting capacitor (C246 through C252; See dia -
gram 4-9 for their location) until the frequency being read on the counter
is on" channel.
3-9 DEVIATION AND MIKE GAIN ADJUSTMENT
eel
Use the following procedure for proper adjustment of the Mike Gain
(R204) and Deviation (R216) control (See diagram 4-9 for their lo-
cation):
a. Connect the unit to the RF wattmeter or dummy load.
b. Connect the scope probe to the junction of R211 and CR201. See
4-5 for location. It may be more convenient to connect the probe
to the cathode lead of CR202.
c. Key the transmitter and talk into the microphone with a normal voice
level. Observe the waveform on the scope and adjust R204 (Mike
Gain) until approximately 10% of the voice peaks are clipped.
d. Connect the audio generator to the mike input terminals. Set the
audio voltage level to 0.5 -1.0 volts RMS at 400 Hz.
e. Couple the FM ModulationMeter's RF pick up to the transmitter.
f. Key the transmitter and adjust R216 (Deviation Control) so that the
maximum deviation is no greater than +5 KHz.
g. Reduce the audio input level to 0.25 volts RMS. The deviation should
not be greater than +5 KHz.
BTL-301 & BTL-304 —J— SECTION 3
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SECTION 4 DIAGRAMS, VOLTAGE DATA AND SCHEMATICS
4-1 RECEIVER BOARD PARTS PLACEMENT DIAGRAM
4-2 RECEIVER BOARD BOTTOM VIEW
4-3 LED DISPLAY BOARDS PARTS PLACEMENT DIAGRAMS
4-4 LED DISPLAY BOARDS BOTTOM VIEWS
4-5 TRANSMITTER BOARD PARTS PLACEMENT DIAGRAM
4-6 TRANSMITTER BOARD BOTTOM VIEW
4-7 TRANSMITTER BOARD TUNE-UP TEST POINTS
4-8 VOLTAGE DATA AND SEMI-CONDUCTOR LOCATION DIAGRAM
4-9 CRYSTAL LOCATION AND ADJUSTMENT DIAGRAM
4-10 SCHEMATIC WITH VOLTAGES (BTL-301)
4-11 SCHEMATIC WITH VOLTAGES (BLT-304)
BTL-301 & BTL-304
SECTION 4
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RECEIVER BOARD 500-943
4-1 RECEIVER BOARD PARTS PLACEMENT DIAGRAM
SECTION 4
BTL-301 & BTL-304
RECEIVER BOARD 500-943
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4-2 RECEIVER BOARD BOTTOM VIEW
BTL-301 & BTL-304 == SECTION 4
L.E.D. DISPLAY BOARD 302-057
BTL-301
L.E.D. DISPLAY BOARD 302-057
BTL-304
4-3 LED DISPLAY BOARDS PARTS PLACEMENT DIAGRAMS
BTL-301 & BTL-304 —3-— SECTION 4
«
BTL-301
ED. DISPLAY BOARD 302-057 «
BTL-304
4-4 LED DISPLAY BOARDS BOTTOM VIEWS
BTL-301 & BTL-304 —4— SECTION 4
TRANSMITTER BOARD 500-996
. (ST | ; “\ PES. i pean
Ke Geect
4-5 TRANSMITTER BOARD PARTS PLACEMENT DIAGRAM
BTL-301 & BTL-304 © a SECTION 4
TRANSMITTER BOARD 500-996
Ae
6 TRANSMITTER BOARD BOTTOM VIEW
4-
SECTION 4
BTL-301 & BTL-304
BTL-301 & BTL-304
GO Gs © oe
POINT "a"
4-7 TRANSMITTER BOARD TUNE-UP TEST POINTS
SECTION 4
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PMIOT TEST VERT RAOG auareineeda
OR LOCATION DIAGRAM
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o the power cable
Base Collector
(Gate) (Drain)
Hp1: 0 4.5
42: 0.8
4.4 iS
0 6.8
Let 4.5
leg, 4.8
(hy O (unsquelched)
Dyes 1.0 (squelched)
One 1.5 min. (tight squelch)
O 1.9 (unsquelched)
0.80 0.30 (squelched)
0.80 0.10 (tight squelch)
ee: 5.1 (unsquelched)
0.10 8.2 (tight squelch)
1.3 24
1322 7.4
6.6 0.10
TA 13.6
Onn0 6.8
0 5
O55 4.6
| 0.65-0.90 6.0* (Varies with setting of R216)
0 130
-0.2 cites
-0.05 cena
-0.9 es
OY 1.0
-0.5 teen
0.9 0.2
1.0 12.4
= 8.2
UITS
eceiver Board, 500-943; IC201 is located on the TX Board
9 10 1] 12 13 14
O2) Lats 2:9 3.5 6 95.0
pO) 0 == = 5.4)
ees SECTION 4
MTT OR POARD BOTPOM View
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4-8 VOLTAGE DATA AND SEMI-CONDUCTOR LOCATION DIAGRAM
NOTE: All voltages are nominal and are measure with a VI VM.
13.8 VDC Supply Voltage at input to the power cable
supplied with the unit.
VOLTAGE DATA — TRANSISTORS |
Emitter _ Base Collector
Transistor (Source) (Gate) (Drain)
Receiver Board
No. 500-943 QIOI(FET) 0) G1: 0 4.5
G2: 0.8
Q102 3.8 4.4 7.8
Q103(FET) 0 | «Se 6.8
Q104 0.4 | te | 4.5
Q105 1.0 Ly 4.8
QIO6(PNP) 8.2 | gag O (unsquelched)
8:2 8.2 1.0 (squelched)
oe 8.2 1.5 min. (tight squelch)
Q107 0 0 1.9 (unsquelched)
0 | O380 0.30 (squelched)
0 | 0.80 0.10 (tight squelch)
Q108 1.4 | ates 5.1 (unsquelched)
a | Ors 8.2 (tight squelch)
Q109 OF 13 12.4
O11 0@PNP) 13.5 | eee 7.4
OMGTCPNP e765 6.6 0.10
Q112 6.8 74 13.8
Os 0 0.10 6.8
TX BOARD 500-996 |
Q201(FET) 0.8 0 5
Q202 0.2 0.5 4.6
Q203 0.15-0.30 0.65-0.90 6.0* (Varies with setting of R216)
Q204 0 | 0 13.0
Q205 0 | 11.3
Q206 0.9 | -0.05 12.1
Q207 1.0 Bee 11.3
Q208 0 U2 1.0
Q209 0.2 | 2s 11.1
Q210 O72 | 0.9 0.2
O21) 0.9 1.0 12.4
O2 12 ite: — 8.2
VOLTAGE DATA—INTEGRATED CIRCUITS
NOTE: IC1014 IC102 are located on the we Board, 500-943; IC201 is located on the TX Board
TING tl ee, es SF) | 10 11 he 13 14
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i)
BTL-301 & BTL-304 =o SECTION 4
T/R RELAY
TRANSMIT CRYSTAL
NETTING CAPACITORS
4 TRANSMIT CRYSTAL
o POSITIONS
MICROPHONE PRE-AMP
DEVIATION ee RECEIVE CRYSTAL °
ADJUSTMENT l
POSITIONS m
MAX. GAIN
CLOCKWISE
MAX. DEVIATION
CLOCKWISE ROTATION
ROTATION
4-9 CRYSTAL LOCATION AND ADJUSTMENT DIAGRAM
BTL-301 & BTL-304 —9— SECTION 4
FWMOITD 42
APEVRD TIMEMAAR:
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ram:
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= —-
c2es |eaze C221 |C220 | c2i9 ed ie L208]
100 120 360 | 350 220 | 820
47 56 |e 200 62 470
360 | 62 47 56 150 | 180 62 470
lee +
36 47 120 150 | 62 470
i____i__| — =
NOT SPECIFIED ARE PICO-FARAD.
IT SPECIFIED ARE OHMS, I/4 WATT.
ACTORY SELECTED. NOMINAL VALUES SHOWN.
OF COMPONENTS NOTED @.
ID L2i2 ARE FERRITE BEADS PLACED OVER
IN RED) ARE NOMINAL VALUES AS MEASURED
VOLTAGE = 13.6 VDC AT INPUT TO POWER CABLE
HIGH IMPEDANCE
A VOLTAGE INDICATES THE FOLLOWING CONDITIONS :
MICROPHONE
IN TRANSMITTER SECTION ARE MEASURED WITH THE
PERATION AND CONNECTED TO A PROPER LOAD.
MATIC WITH VOLTAGES (BTL-301)
04 210” SECTION 4
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{ 180 TRA.
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= R29
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68
a sz | a2 [22 | 8.2 |
% ae
137
a tease TRANSMITTER
= 1-7 cue | T
001 FREQUENCY || c238 | c235 | C233 | c230 | c22s | c227 | c226 |c225 | c223 | c2z2 | c221 |c220| c2i9
A RI25 ‘8
100
RI69 es 29-32mz |] 390 1000 | 360 | 50 | 470 | 220] 100 220
2.7K | 1
1 cis! xy 32-35muHz || 360 1000] 300 | 180 | 470 | 220] 2
FIIOAMP 13.8 voc 35-3emnz || 360 1000 | 270 | 100 360 | 180] 68
Los ee
i 38-41 MHZ || 270 1000} 260 | 100 | 360} 150 | 56
(| _— ——+—
eal DC POWER CORD 41-44Muz || 270 470 | 220 | 82 | 360 | 100 | 47
680 (|
44-47MuHz || 180 t20 | 470 | 180 | 75 | 360} e2 | 47
GNO 20m | i180 470 120 | 75 | 360 82 | 36
L030)
NOTES:
= |, ALL CAPACITOR VALUES NOT SPECIFIED ARE PICO-FARAD.
ALL RESISTOR VALUES NOT SPECIFIED ARE OHMS, 1/4 WATT
= 2 4 NOTED VALUES ARE FACTORY SELECTED. NOMINAL VALUES SHOWN
3. SEE TABLES FOR VALUES OF COMPONENTS NOTED @.
4. 208,1209,L210,L2N, AND L2I2 ARE FERRITE BEADS PLACED OVER
COMPONENT LEADS.
5, ALL VOLTAGES (FIGURES IN RED) ARE NOMINAL VALUES AS MEASURED
WITH A VTVM, SUPPLY VOLTAGE = 13.8 VDC AT INPUT TO POWER CABLE
7.4 ds SUPPLIED WITH UNIT.
R207 ae 0. LETTER FOLLOWING A VOLTAGE INDICATES THE FOLLOWING CONDITIONS :
R203 thc2os R208 Seek ‘y = UNSQUELCHED
OK C204 25 ut IF $= SQUELCHED - THRESHOLD
te 206 ~ c207 T= SQUELCHED - TIGHT
neo. ce0t 2s ce oe R2i1 b. VOLTAGES INDICATED IN TRANSMITTER SECTION ARE MEASURED WITH THE
ok = Qt ° (ee apes s be (~~ te Jox TRANSMITTER IN OPERATION AND CONNECTED TO A PROPER LOAD.
= WAs 10K Ww
2
202 P
R202 $ c20 in R209 sot
18K ms
+1 c203 05,
1Out 3.9K
R24
13.0 R237 ce 150 R242
van Re 27K ™ Cds
R223
10 ee |
L2i2 12.4 ai —
0206 R247
2.1 Ta C240 47K
céz2 * (SS \0.08 225 CY 7,
o or o ot) Lo C24 are
ee ange 7 o 2), oreoe | | 1s
{| ig b.9 { ra
2 T™ aan cee
i
{ L206 R243 re
Rok \ tl
c224 R240 CR205 7% R244 R246 R248
-Oluf $R222 SRe24 239 R238 87k 100K | p C244 27K
Scag naa 10 22 “lt me to ie 180
c24s c24s
2-18 39
4-10 SCHEMATIC WITH VOLTAGES (BTL-301)
BTL-301 & BTL-304 —10— SECTION 4
i cio clos
Cio!
x L102
{ Lio! clo4 t 4
He cio2
Be
SwiB
O-
LO301
LD302|_LD303) LD304;
CP
Fal
R301
680
47
i
HIGH IMPEOANCE
MICROPHONE
L201
C254
3-35
8.2
RECEIVER
[rreavency| [ovo Jetoe C103 | C104 [cios clos [erst [cise
Lo
35-44MHZ|| 22 | 220
30-35 MHZ|| 33 300 | 12 27 12 22 | 27 1s
| 44-SOMHZ 15 150
TRANSMITTER
=
FREQUENCY case | c2as c2ss | caxo 229 | c227 | c226 |c225 | c223 | czz2 | c22i e220 | cate c269 | L206 | L202
=I T =|
29-32MHz || 390 | 680 200 | 1900 360 | 150 | 470 | 220] 100 | 120 | 360 | 390 | 220| 820 Pee Poets
m| as 0 ——s e
32-35MHZ || 360 | $60 | 220 | 1000 | 300 | 150 | 470 | 220 | 82 | 100 | 270 | 360 | 220 | e20 | 30b | 302-
-+
35-38MHZ || 360 | 560 | 220 | 1000] 270 | 100 | 360 | 150 | 68 | @2 | 250 | 300 | 220 | e20 | SOF |302-
,—4
38-41 MHz || 270 | 390 | 200 | 1000 220 | 19 360 so | | 75 | 200 | 280 | 220 | 470 | 30h aaee
| i 7 302-| 1o2-
41-44MHZ || 270 | 390 | 150 | 470 | 220 | 82 | 360 | 100 | 47 | 56 | 180 | 200 | @2 | 470 |302-| 102
if im T i
44-47MHZ || 180 | 220 | \20 | 470 | 180 | 75 | 360] 82 | 47 | 56 | 150 | 180 | 2 | 470 |302-| 102—
083 | 742
Ik
47-50MHZ || 180 | 220 | 120 | 470 | 180 | 75 | 360 | 82 | 36 | 47 | 120 | 150 | 62 | 470 | 302-| 102-
ie 083 742
NOTES:
1. ALL CAPACITOR VALUES NOT SPECIFIED ARE PICO-FARAD.
ALL RESISTOR VALUES NOT SPECIFIED ARE OHMS, !/4 WATT.
2. LX NOTED VALUES ARE FACTORY SELECTED. NOMINAL VALUES SHOWN
SEE TABLES FOR VALUES OF COMPONENTS NOTED ©.
4. (208,L209,L210,L2I1, ANDO L2I2 ARE FERRITE BEADS PLACED OVER
COMPONENT LEADS.
5. ALL VOLTAGES (FIGURES IN RED) ARE NOMINAL VALUES AS MEASURED
WITH A VTVM. SUPPLY VOLTAGE = 13.8 VDC AT INPUT TO POWER CABLE
SUPPLIED WITH UNIT.
a. LETTER FOLLOWING A VOLTAGE INDICATES THE FOLLOWING CONDITIONS :
= UNSQUELCHED
$= SQUELCHED - THRESHOLD
T= SQUELCHED — TIGHT
b. VOLTAGES INDICATED IN TRANSMITTER SECTION ARE MEASURED WITH THE
TRANSMITTER IN OPERATION AND CONNECTED TO A PROPER LOAD.
ow
L203,
SWIA = Joos)
°
Ci) y201 Coly202 - ie
C246 0248 c250 c252
2-18 2-18] 2-18 2-18]
36
4-11 SCHEMATIC WITH VOLTAGES (BLT-304)
BTL-301 & BTL-304 == 1 SECTION 4
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RECEIVER
FREQUENCY eo 101 [ee2 [ores
30-35 mHz|| 33 [2 [= |
35-44mHz|| 22 | 220 | Lo | * ae 22
44-somuz|| 15 | iso | .e2 | 0 22
TRANSMIT TER
clos |c106 [evs Jose
Ci34
470 a | T
Freouenc [cee C235 | C233 | C230 | C229 | C227 | C226 | C225 | C223 | C222 | C221 | c220 care [cess L206 | L202
=
29-32MHZ 390 | 680 300 [ 00
32-35 MHZ 360 | 560 | 220 | 1000
+
tse Fl lOAMP 13.8 voc 35-36 malt 360 | 560 | 220 | 1000
He 13.4 Tx
13.8 RX Swi 38-41 mHz || 270 | 390 | 200 | 1000
ican cl
| ON vce OC POWER CORD 41-44muHz || 270 | 390 | 150 | 470
iciag | 05yt L 4
+ 11000," 44-47MHzZ || 180 | 220 | 120 | 470
is CRIOS +
56 ;
47-SOMHZ 180 | 220 | 120 | 470
NOTES
‘ ALL CAPACITOR VALUES NOT SPECIFIED ARE PICO-FARAD
ALL RESISTOR VALUES NOT SPECIFIED ARE OHMS, |/4 WATT.
2. Q NOTED VALUES ARE FACTORY SELECTED. NOMINAL VALUES SHOWN.
SEE TABLES FOR VALUES OF COMPONENTS NOTED Q.
4. L206,L209,L 210,211, AND L2I2 ARE FERRITE BEADS PLACED OVER
COMPONENT LEADS.
5. ALL VOLTAGES (FIGURES IN RED) ARE NOMINAL VALUES AS MEASURED
WITH A VTVM. SUPPLY VOLTAGE = 13.6 VDC AT INPUT TO POWER CABLE
SUPPLIED WITH UNIT
)
cele 9. LETTER FOLLOWING A VOLTAGE INDICATES THE FOLLOWING CONDITIONS :
U= UNSQUELCHED
IMPEDA
HIGH IMPEDANCE I S= SQUELCHED - THRESHOLD
T= SQUELCHED - TIGHT
aie, ° b. VOLTAGES INDICATED IN TRANSMITTER SECTION ARE MEASURED WITH THE
ta TRANSMITTER IN OPERATION AND CONNECTED TO A PROPER LOAD.
I cere
R202
1ooK .
13.0
R220
33
4-11 SCHEMATIC WITH VOLTAGES (BLT-304)
BTL-301 & BTL-304 —11- SECTION 4
hal
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SECTION 5 PARTS LIST
5-1 RECEIVER BOARD 500-943
Item Description Part No. Item Description Part No.
RESISTORS CAPACITORS
All Resistors are +10%, %W, unless otherwise noted, ©101 :
ci02.*
R101 1K
R102. -22K Abn sh
R103. 100K ee
R104. 680 ohm PU ig 5
R105. 10K C10G Sa
Dae C107 —-220pf, 5%, 50V (Mica) 1506-0221-550
ORE. C108 Same as C107 |
moa om S08 0) oe) moa
pf, 5%, ica F :
La Dene C111 68pf, 5%, 50V (Mica) 1506-0680-550
eee C112. 001 mf, +80 -20%, 500V Z5U (Disc.) 1503-0102-001
Pe C113. .O1mf, +80 -20%, 500V Z5U (Disc.) 1503-0103-001
ae te C114. ——-220pf, 5%, 50V (Mica) 1506-0221-550
Ot ae C115: 150pf, 5%, 50V (Mica) | 1506-0151-550
hy te C116 .O1mf, +80 -20%, 500V Z5U (Disc.) 1503-0103-001
C117 —-220pf, 5%, 50V (Mica) 1506-0221-550
R116 150 ohm :
C118 01m, +80 -20%, 500V Z5U (Disc.) 1503-0103-001
R117. 33 ohm
R118 47K C119 Same as C118
Bake. a C120 GBF, 5%, 50V (Mica) 1506-0680-550
nie ie C121 .2mf, +80 -20%, 12V (Disc.) 1501-0204-006
Ce ane C122 —_-270pf, 5%, 50V (Mica) 1506-0271-550
BA oS C123: 250pf, 5%, 50V (Mica) 1506-0251-550
Me C124 .2mf, +80 -20%, 12V (Disc.) 1502-0204-006
ie C125 —-270pf, 5%, 50V (Mica) 1506-0271-550
eee ee C126 —-250pf, 5%, 50V (Mica) 1506-0251-550
a C127 —-.2mF, +80 -20%, 12V ( Disc.) 1502-0204-006
C128 Same as C127
ited, 10K C129 Same as C127
a ss ve C130 .002mf, 20%, 500V Z5U (Disc.) 1523-0202-001
_ ee C131 39pf, 10%, NPO, 500V. 1500-0390-605
C132 .047mf, 10%, 100V (Mylar Film) 1508-0473-610
ae “oe C133. .01mf, 10%, 100V (Mylar Film) 1508-0103-610
: C134 —-470pf, 20%, S00V Z5U (Disc.) 1523-0471-001
ae ak C135. .015mf, 10%, 100V (Mylar Film) 1508-0153-610
pice. B&Q. chm C136 .047mf, 10%, 100V (Mylar Film) 1508-0473-610
ihe ie ohm C137. .002mf, 20%, 500V Z5U (Disc.) 1523-0202-001
C138 mf, 85°C, SOV, (Electrolytic) 1513-0050-004
oS C139. 1mf, 20%, 12V (Disc.) 1502-0104-005
pass) 8816 C140. .047mf, 10%, 100V (Mylar Film) 1508-0473-610
miez | 18K C141: 100mf, 85°C, 10V (Electrolytic) 1513-0101-001
Bao Ak C142. .047mf, 10%, 100V (Mylar Film) 1508-0473-610
Bian 122K C143. Same as C142
Bige. — 2epohm C144: 10mf, 85°C, 10V (Electrolytic) 1513-0100-001
Bie Pecan C145. 00 1Imf, +80 -20%, 500V Z5U (Disc.) 1503-0102-001
pigs.) 1.3K C146. Same as C145
Bige- 109 onm C147 Same as C145
R146 68 ohm, 2W, 5%
R148 680 ohm
BTL-301 & BTL-304
SECTION 5
ES
Item No.
Description
Part No.
EEE
CAPACITORS
250mf, 85°C, 16V (Electrolytic)
1000mf, 85°C, 16V (Electrolytic)
250mf, 85°C, 10V (Electrolytic)
*
*
1511-0251-002
1511-0102-002
1511-0251-001
* The value of these capacitors depends on frequency
and are given below:
29-35MHz: Receiver Certification No. RL14A
33pf, 10%, 500V, NPO (Disc.)
300pf, 5%, 50V (Mica)
1.2pf, 10% (Composition)
27pf, 10%, 500V, NPO (Disc.)
1.2pf, 10% (Composition)
22pf, 10%, 500V, NPO (Disc.)
2.7pf, 10%, 500V, NPO (Disc.)
15pf, 10%, 500V, NPO (Disc.)
1500-0330-605
1506-0301-550
1510-0129-900
1500-0270-605
1510-0129-900
1500-0220-605
1500-0279-905
150C-0150-605
35-44 MHz% Receiver Certification No. RL14B
22pf, 10%, 500V, NPO (Disc.) .
220pf, 5%, 50V (Mica)
1pf, 10% (Composition)
18pf, 10%, 500V, NPO (Disc.)
0.82pf, 10% (Composition)
12pf, 10%, 500V, NPO (Disc.)
2.2pf, +0.25pf, NPO (Disc.)
10pf, 10%, 500V, NPO (Disc.)
1500-0220-605
1506-0221-550
1510-0010-900
1500-0180-605
1510-0828-900
1500-01 20-605
1500-0229-205
1500-0100-905
44-50 MHz: Receiver Certification No. RL14C
15pf, 10%, 500V, NPO (Disc.)
150pf, 5%, 50V (Mica)
0.82pf, 10% (Composition)
10pf, 10%, 500V, NPO (Disc.)
0.82pf, 10% (Composition)
82.pf, 10%, 500V, NPO (Disc.)
2.2pf, +0.25pf, NPO (Disc.)
8.2pf, 10%, 500V, NPO (Disc.)
COILS
Coil RF (Yel)
Same as L101
Same as L101
Coil RF (Wht)
Coil TMR
Coil. Shielded
Same as L106
Coil
Coil IF 10.7 Input
Coil 1F 10.7 Out
TRANSISTORS
MOS FET
Silicon NPN
Junct FET
Silicon NPN
BTL-301 & BTL-304
1500-0150-605
1506-0151-550
1510-0828-900
1500-0100-905
1510-0828-900
1500-0829-905
1500-0229-205
1500-0829-905
1800-3191-402
1800-3191-401
1801-1236-900
1802-3182-700
1800-3151-700
1800-3190-300
1800-3190-400
4811-0000-001
4801-0000-100
481 1-0000-030
4801-0000-010
ee TEE EEE EEE
CF-1
Y113
ey
Description
TRANSISTORS
Same as Q104
Silicon PNP
Silicon NPN
Same as Q107
Same as Q107
Silicon PNP
Same as 0110
Silicon NPN Power
Same as 0112
DIODES
Diode, Silicon
Diode, Zener (8.2V)
Diode, Silicon Rectifier
INTEGRATED CIRCUITS
IC, 10.7 IF
IC, 455 KHzDetector
FILTER
455 KHz Ceramic Filter
CRYSTAL
10.245 MHz (301-516-1) or
11.155 MHz (301-516-2)
Part No.
4801-0000-060
4801-0000-010
4801-0000-135
4802-0000-002
4805-124 1-200
4808-0000-009
4806-0000-004
3130-3167-901
3130-3157-603
2700-0000-008
2301-3151-601
2301-3151-602
SECTION 5
5-2 TRANSMITTER BOARD 500-996
RESISTORS
Description
Part No.
All Resistors are +10%, “W, unless otherwise noted.
Item No.
R201 10K
R202 100K
R203 10K
R204 Trimmer, 10K
R205 3.9K
R206 2.7K
R207 6.8K
R208 68K
R209 18K
R210 470 ohm
R211 10K
R22 39K
R213 120K
R214 27K
R215 39K
R216 Trimmer, 10K
R217 470 ohm
R218 270 ohm
R219 27 ohm
R220 3.2 ohm
R221 18 ohm
R222 10 ohm
R223 10 ohm
R224 22 ohm
R225 100 ohm
R226 47 ohm
R227 270 ohm
R228 470 ohm
R229 3.9K
R230 10 ohm
R231 100 ohm
R232 100 ohm
R233 10 ohm
R234 10K
R235 82K
R236 4.7K
R237 100 ohm
R238 150 ohm
R239 27K
R240 2.7K
R241 100 ohm, 1W, 10%
R242 68K
R243 100K
R244 100K
R245 120 ohm
R246 180 ohm
R247 47K
R248 27K
R250 150 ohm
BTL-301 & BTL-304
4751-0103-001
4751-0103-001
4701-0339-042
4701-0101-042
te tee
Item No.
C201
C202
C203
C204
C205
C206
C207
C208
C209
C210
C211
C212
C213
C214
C215
C217
C218
C219
C220
C221
C222
C223
C224
C225
Description
CAPACITORS
.O1mf, 10%, 100V (Mylar Film)
47pf, 5%, 50V (Mica)
10mf, 85°C, 10V (Electrolytic)
mf, 20%, 12V (Disc.)
25mf, 85°C, 10V (Electrolytic)
A7mf, +80 -20%, 3V (Disc.)
Amf, 20%, 12V (Disc.)
.0033mf, 10%, 100V (Mylar Film)
.022mf, 10%, 100V (Mylar Film)
.Amf, 20%, 12V (Disc.)
A7mf, +80 -20%, 3V (Disc.)
.Imf, 20%, 12V (Disc.)
.01mf, +80 -20%, 16V (Disc.)
.05mf, +80 -20%, 16V (Disc.)
10mf, 20%, 25V (Tantalum)
4-40pf, MICA Trimmer
90-400pf, MICA Trimmer
220pf, 5%, 500V MICA (29-41 MHz)
82pf, 5%, 500V MICA (41-50 MHz)
390pf, 5%, 500V MICA (29-32 MHz)
360pf, 5%, 500V MICA (32-35 MHz)
300pf, 5%, 500V MICA (35-38 MHz)
250pf, 5%, 500V MICA (38-41 MHz)
200pf, 5%, 500V MICA (41-44 MHz)
180pf, 5%, 500V MICA (44-47 MHz)
150pf, 5%, 500V MICA (47-50 MHz)
360pf, 5%, 50V MICA (29-32 MHz)
270pf, 5%, 50V MICA (32-35 MHz)
250pf, 5%, 50V MICA (35-38 MHz)
200pf, 5%, 50V MICA (38-41 MHz)
180pf, 5%, 50V MICA (41-44 MHz)
150pf, 5%, 50V MICA (44-47 MHz)
120pf, 5%, 50V MICA (47-50 MHz)
120pf, 5%, 50V MICA (29-32 MHz)
100pf, 5%, 50V MICA (32-35 MHz)
82pf, 5%, 50V MICA (35-38 MHz)
75pf, 5%, 50V MICA (38-41 MHz)
56pf, 5%, 50V MICA (41-47 MHz)
A47pf, 5%, 50V MICA (47-50 MHz)
100pf, 5%, 50V MICA (29-32 MHz)
82pf, 5%, 50V MICA (32-35 MHz)
68pf, 5%, 50V MICA (35-38 MHz)
56pf, 5%, 50V MICA (38-41 MHz)
47pf, 5%, 50V MICA (41-47 MHz)
36pf, 5%, 50V MICA (47-50 MHz)
.01, +80 -20%, 16V (Disc.)
220pf, 5%, 50V MICA (29-35 MHz)
150pf, 5%, 50V MICA (35-41 MHz)
100pf, 5%, 50V MICA (41-44 MHz)
82pf, 5%, 50V MICA (44-50 MHz)
Part No.
1508-0103-610
1507-0470-001
1513-0100-001
1502-0104-005
1513-0250-001
1502-04 74-001
1502-0104-005
1508-0332-610
1508-0223-610
1502-0104-005
1502-04 74-001
1502-0104-005
1502-0103-003
1502-0503-003
1515-0100-005
1517-0000-009
151 7-0000-008
1504-0221-505
1504-0820-505
1504-0391-505
1504-0361-505
1504-0301-505
1504-0251-505
1504-0201-505
1504-0181-505
1504-0151-505
1506-036 1-550
1506-0271-550
1506-0251-550
1506-0201-550
1506-0181-550
1506-0151-550
1506-0121-550
1506-0121-550
1506-0101-550
1506-0820-550
1506-0750-550
1506-0560-550
1506-04 70-550
1506-0101-550
1506-0820-550
1506-0680-550
1506-0560-550
1506-04 70-550
1506-0360-550
1502-0103-003
1506-0221-550
1506-0151-550
1506-0101-550
1506-0820-550
SECTION 5
Ee
Item No.
Description
Part No.
a
C228
C229
C230
C231
C232
C233
C235
C236
C237
C238
C239
C240
C241
C242
C243
C244
C246
C247
*C248
*C249
*C250
2C254
C252
*C253
C254
C255
C269
C270
C271
C272
CAPACITORS
470pf, 5%, 50V MICA (29-35 MHz)
360pf, 5%, 50V MICA (35-50 MHz)
150pf, 5%, 50V MICA (29-35 MHz)
100pf, 5%, 50V MICA (35-41 MHz)
82pf, 5%, 50V MICA (41-44 MHz)
75pf, 5%, 50V MICA (44-50 MHz)
.01, +80 -20%, 16V (Disc.)
360pf, 5%, 50V MICA (29-32 MHz)
300pf, 5%, 50V MICA (32-35 MHz)
270pf, 5%, 50V MICA (35-38 MHz)
250pf, 5%, 50V MICA (38-41 MHz)
220pf, 5%, 50V MICA (41-44 MHz)
180pf, 5%, 50V MICA (44-50 MHz)
1000pf, 5%, 50V MICA (29-41 MHz)
470pf, 5%, 50V MICA (41-50 MHz)
.005mf, +80 -20%, 500V Z5U (Disc.)
.01mf, +80 -20%, 16V (Disc.)
300pf, 5%, 50V MICA (29-32 MHz)
220pf, 5%, 50V MICA (32-38 MHz)
200pf, 5%, 5|OV MICA (38-41 MHz)
150pf, 5%, 50V MICA (41-44 MHz )
120pf, 5%, 50V MICA (44-50 MHz)
680pf, 5%, 50V MICA (29-32 MHz)
560pf, 5%, 5OV MICA (32-38 MHz)
390pf, 5%, 50V MICA (38-44 MHz)
220pf, 5%, 50V MICA (44-50 MHz)
100pf, 5%, 50V (Mica)
.01mf, +80 -20%, 16V (Disc.)
390pf, 5%, 50V MICA (29-32 MHz)
360pf, 5%, 50V MICA (32-38 MHz)
270pf, 5%, 50V MICA (38-44 MHz)
180pf, 5%, 50V MICA (44-50 MHz)
Amf, 20%, 12V (Disc.)
27pf, 10%, 500V, NPO (Disc.)
5pf, 10%, 500V NPO (Disc.)
.Imf, 20%, 12V (Disc.)
150pf, 5%, 50V (Mica)
Same as C243
2-18pf, Trimmer
36pf, 5%, 50V, NPO (Disc)
Same as C246
Same as C247
Same as C246
Same as C247
Same as C246
Same as C247
4-40pf, MICA Trimmer
A7pf, 5%, 500V (Mica)
820pf, 5%, 500V MICA (29-38 MHz)
470pf, 5%, 500V MICA (38-50 MHz)
.0imf, +80 -20%, 16V (Disc.)
390pf, 5%, 50V (Mica)
.0047mf, 10%, 100V (Mylar Film)
*Used on BTL-304 ONLY
BTL-301 & BTL-304
1506-0471-550
1506-0361-550
1506-0151-550
1506-0101-550
1506-0820-550
1506-0750-550
1502-0130-003
1506-036 1-550
1506-0301 -550
1506-0271-550
1506-0251 -550
1506-0221-550
1506-0181-550
1507-0102-004
1506-0471-550
1503-0502-002
1502-0103-003
1506-0301 -550
1506-0221-550
1506-0201-550
1506-0151-550
1506-0121-550
1506-0681 -550
1506-056 1-550
1506-0391 -550
1506-0221 -550
1507-0102-004
1502-0103-003
1506-0391-550
1506-036 1-550
1506-0271-550
1506-0181-550
1502-0104-005
1500-0270-605
1500-0050-905
1502-0104-005
1506-0151-550
1517-0000-001
1500-0360-550
i}
1517-0000-009
1504-0470-505
1504-0821-505
1504-0471-505
1502-0103-003
1506-0391 -550
1508-0472-610
nee EEE EERE
Item No. Description Part No.
COILS
L201 Coil, Final Output 1801-3208-700
L202 Coil, Antenna Output (29-41 MYz) 1801-3208-600
Coil, Antenna Output (41-50 MHz) 1801-1274-200
L203 Coil, RF Choke 1803-3189-800
L204 Choke Bead Coil 1803-1245-900
L206 Coil, Modulator (29-41 MHz) 1800-3189-200
Coil, Modulator (41-50 MHz) 1800-3208-300
L208 Ferrite Bead 2502-0000-001
L209 Same as L208
L210 Same as L208
L211 Same as L208
L212 Same as L208
T301 Transformer, SWR Bridge 1800-3190-100
T302 Transformer, Driver (Violet) 1800-3189-701
T303 Transformer (Blue) 1800-3189-601
T304 Transformer (Green) 1800-3189-501
T305 Transformer (Yellow) 1800-3189-401
T306 Transformer (Orange) 1800-3189-301
TRANSISTORS
Q201 Junct. FET 481 1-0000-030
Q202 Silicon NPN 4801-0000-010
Q203 Same as Q202
Q204 Silicon, RF Power NPN 4804-3169-503
Q205 Silicon, RF Power NPN 4804-3169-604
Q206 Silicon NPN 4804-0000-015
Q207 Silicon NPN (BT) 4801-0000-003
Q208 Silicon NPN 4801-0000-010
Q209 Silicon NPN (BT) 4801-0000-003
Q210 Silicon NPN 4801-0000-005
Q211 Silicon NPN (BT) 4801-0000-003
Q212 Same as Q211
NOTE: BT=Blue Top
INTEGRATED CIRCUITS
1C201 IC, Divider 3130-3157-607
Shield, |.C. 2508-1 265-900
DIODES
CR201 Diode Silicon 4805-1 241-200
CR202 Diode Silicon 4805-1241-200
CR203 __— Diode Silicon 4805-1241-200
CR204 +#Didde Varicap MY2209 4809-0000-001
CR205 _ ~==Diode Varicap MY 2209 4809-0000-001
CR206 =~ Diode Zener 8.2V 1W 47384 4808-0000-009
a SECTION 5
5-3 LED DISPLAY BOARD (BTL-301) 302-057
Item No. Description Part No.
RESISTORS
All Resistors are AW, 10%, unless otherwise noted.
R301 680 ohm
R302 470 ohm
DIODES
LD301 LED (Red) 4810-0000-001
LD302 Same as LD301
BTL-301 & BTL-304 Oo
5-4 LED DISPLAY BOARD (BTL-304) 302-057
Item No. Description Part No.
RESISTORS
All Resistors are “ZW, 10%, unless otherwise noted.
R301 680 ohm
R302 470 ohm
DIODES
LD301 LED (Red) 4810-0000-001
LD302 Sameas LD301
LD 303 Same as LD301
LD304 Same as LD301
LD305 Sameas LD301
SECTION 5
5-5 CHASSIS ASSEMBLY
ee
Item No. Description Part No.
ELECTRICAL COMPONENTS
R1 Res Var. 5K/SW 4750-1 230-305
R2 Res Var. 7.5K 4750-1 230-306
C1 15pf, 10% NPO (Disc.) 1501-0150-001
C2 .O5mf, +80 -20%, 25V (Disc.) 1501-0503-003
RY-1 Relay, Transmit-Receive, 12VDC 4500-0000-002
SPK-1 Speaker, 3.2 ohm, 4 inch square
(Assembly with Mounting Bracket) 301-934
Y100 Crystals, Receive (Specify Frequency) 302-032
2316-0000-000
Y200 Crystals, Transmit (Specify Frequency) 302-075
23 17-0000-000
SW1,SW2 Switch, Push, Interlocking 5112-6037-302
J1 Connector, Antenna 2105-0000-020
J2 Connector, Chassis - 4 cond. Microphone 2105-0000-021
Assy. Chassis Mic. Connector & Bracket 102-628
P2 Connector, Cable - 4 cond. Microphone 2104-0000-001
P1 Connector, Chassis, Power 2104-0000-004
$1 Connector, Cable, Power 2108-1272-901
F1 Fuse, 10 Amp., 3 AG 5106-0000-007
Microphone, Ceramic (No Connector) 1300-5080-902
Microphone Assy. (Complete) 600-337-6
DC Power Cord Assy. 102-521-3
Cable, Shielded, Audio Jefflex
Cable, Coaxial 50 ohm Teflon RG-188/U
MECHANICAL COMPONENTS
Faceplate (BTL-301)
Faceplate (BTL-304)
Front Panel (Bezel)
Knob, Volume & Squelch
Socket Pins, Crystal
Heat Sink, Driver Transistor
Heat Sink, Final Transistor
Bracket, Relay Mounting
Terminal Board, 3 Lug (Rear Panel)
Foot, Rubber
Cabinet/Wrap Assembly
Bracket, Mobile Mounting
Bracket, Security
Bracket, Mic. Conn.
BTL-301 & BTL-304
2403-3206-300
2403-3206-500
1405-6034-301
2402-31 78-301
2830-0000-004
5400-0000-002
5400-3192-100
1400-1246-600
2103-3007-907
1402-0000-001
1408-6035-202
1400-3192-400
1400-1241-500
1400-1258-200
SECTION 5
SECTION 6 SERVICE MANUAL ADDENDUM
The following modifications now exist in the BTL-301 and BTL-304 VHF
FM transceivers. The revisions include the addition of a Power Regulator
Board, 302-342 and the modification of the existing Transmitter Board
900-996. Effective June, 1974.
ADDENDUM CONTENTS
6-1 Text revisions
6-2 Component revisions to Transmitter Board 500-996
6-3 Transmitter Block Diagram
6-4 ‘Transmitter Board Parts Placement Diagram
6-5 Transmitter Board Parts Overlay Diagram
6-6 Power Regulator Board Parts Placement Diagram
6-7 Power Regulator Board Parts Overlay Diagram
6-8 Power Regulator Board Parts List
6-9 Schematic with Voltages (BTL-301)
6-10 Schematic with Voltages (BTL-304)
6-1 TEXT REVISIONS
pection 1; Page 3
Specifications are the same as described in Section 1 except for the following
change:
SEH COMMinsat Sie lONon OLAL ) suerte newt’ eto pee, EU tn ee il kets eh gun ve a 26
Section 2; Page 4
Power output section description is the same as described in Section 2 except
for the following changes:
c. SWR Bridge
In the event of a load mismatch at the antenna terminals, the SWR
Bridge consisting of T201, R218 and CR203 will detect the mismatch
and send a signal to the Driver Limiter. The Driver Limiter (Q208,
Q401 and Q402) will then bias Q205 in an off condition, preventing pos -
sible damage to the power amplifier (Q204). Load mismatch is de-
tected by comparing the phases of output voltage and current to de-
termine if standing waves exist on the line.
BTL-301 & BTL-304 pile SECTION 6
Section 3; Page 6
Transmitter tuning procedure is the same as described in Section 3 except
for the following changes:
3-7-10 T203: Connect the VTVM probe to the junction of T202 and C270
and the common lead to ground. Adjust the secondary core and
then the primary core for a dip in the meter reading. Normal
voltage should be 13.0 V.
3-7-11 T202: Adjust both primary and secondary for maximum RF power
output as indicated on wattmeter.
6-2 COMPONENT REVISIONS TO TRANSMITTER BOARD 500-996
See 6-4 and 6-5 for exact locations of component added.
Components Added:
C273, .Ol pf, +80-20%, 50V, YM (Disc.) 1503-0103-007 - Copper Side
C274, .01 pf, +80-20%, 50V, YM (Disc.) 1503-0103-007 - Copper Side
C275, .0l pf, +80-20%, 50V, YM (Disc.) 1503-0103-007 - Copper Side
C276, .01 pf, +80-20%, 50V, YM (Disc.) 1503-0103-007 - Component Side
Jibde: tom Gia eaten’. Copper Side
I) Zenit tects ative’ s \apeasieets Component Side
Saree ces teen camels see aie es, wits Component Side
Components Removed:
R220 3.2 Ohms +10% 1/4W
R226 47 Ohms +10% 1/4W
R232 100 Ohms +10% 1/4W
R333 10 Ohms +10% 1/4W
R234 10K +10% 1/4W
C234 NOT USED
Q210 Silicon NPN 4801-0000 -005
Board Jumpers (TX Bd. To Pwr. Reg. Bd.)
Point A Yellow Wire
Point B Orange Wire
Point C Black Wire
Point D Green Wire
BTL-301 & BTL-304 oe SECTION 6
CAPACITANCE VALUE MODIFICATIONS
L) At 35 to 41 MHz, C219 should have an 82 PF value instead of a 220 PF value.
At 35 to 41 MHz, C269 should have a 1000 PF value instead of an 820 PF
value at 35 to 38 MHz and a 470 PF value at 38-41 MHz.
At 41 to 50 MHz, C269 is no longer used.
See Transmitter Component Value Table on 6-9 and 6-10.
BTL-301 & BTL-304 -3- SECTION 6
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6-3 TRANSMITTER BLOCK DIAGRAM
SECTION 6
BTL-301 & BTL-304
d))
__ TRANSMITTER BOARD _ 500-996
6-4 TRANSMITTER BOARD PARTS PLACEMENT DIAGRAM
BTL-301 & BTL-304
SECTION 6
TRANSMITTER BOARD 500-996.
6-5 TRANSMITTER BOARD PARTS OVERLAY DIAGRAM Cc
BTL-301 & BTL-304 -6- SECTION 6
6-6 POWER REGULATOR BOARD PARTS PLACEMENT DIAGRAM
POWER REGULATOR BOARD 302-3
6-7 POWER REGULATOR BOARD PARTS OVERLAY DIAGRAM
BTL-301 & BTL-304 -7- SECTION 6
6-8 POWER REGULATOR BOARD 302-342 PARTS LIST
Item No. Description Part No.
RESISTORS
R401 3.3K 10% “ZW 4701-0332-042
R402 150 ohms 10% %2W 4701-0151-044
R403 150 ohms 10% “”“W 4701-0151-044
CAPACITORS
C401 .01 uf +80-20% 50V YM (Disc.) 1503-0103-007
C402 .01 uf +80-20% 50V YM (Disc.) 1503-0103-007
C403 .01 uf +80-20% 50V YM (Disc.) 1503-0103-007
C404 10 uf 20% 25V TANT 1515-0100-005
C405 150 pf 20% 50V Z5F 1523-0151-002
C406 10 uf 20% 25V TANT 1515-0100-005
C407 .01 uf +80-20% 50V YM (Disc.) 1503-0103-007
C408 10 uf 20% 25V TANT 1515-0100-005
TRANSISTORS
Q401 Silicon SPS 952 4801-0000-010
Q402 Silicon Power PNP SJE 1608 4802-0000-003
BTL-301 & BTL-304
SECTION 6
RIO3
clo7
220
RECEIVER
FREQUENCY || CIO [eve C103 |cioa clos [cios [ewe [cise
30-35mH2| 33) || 3000}, Hay i277 Waiio | 22h 2i7) || 16.
35-44MHz|| 22 |220 | 10 | 1 | .e2 | I2 2.2 | 10
44-S0MHz|| I5 | 0 82 | 10 ie 8,2 [22 | 8.2
TRANSMITTER
freauency 238 [ezzs 233 | 230 | c229 | c227 | c226 | c225 | cz23 | c222 | c22I |c220| c2i9 | cz69 |L206|L202}c2I7 |c254
29-32Mxz || 390 | 680 | 300 | 100] 360 | 150 | 470 | 220| 100 | 120 ae 390
32-35 MHz || 360 | 560 | 220 | 1000 soo [ 0 | 7 220 | 82 | 100 | 270 | 360
35-38MHZ || 360 | 560 | 220 | 1000] 270 | 100 | 360 | 150 | 68 | 82 | 250 | 300
I
38-41 MHz || 270 | 390] 200 | 1000] 260 | 100 | 360 | 150] 56 | 75 | 200 | 250
al
4l-44muz || 270 | 390 | 150 | 470 | 220 | 82 | 360 | 100 | 47 | 56 | 180 | 200
if
44-47MuHz || 180 | 220 | 120 «ro | iso | 75 Baia 47 | 56 | 150 | 180
«7-some || 180 | 220 | 120 | 470 | 180 | 75 | 360] 62 | 36 ie \20 | 150
BITL-30/
NOTES:
1, ALL CAPACITOR VALUES NOT SPECIFIED ARE PICO-FARAD.
ALL RESISTOR VALUES NOT SPECIFIED ARE OHMS, 1/4 WATT.
13.3TX 2. QQ NOTED VALUES ARE FACTORY SELECTED. NOMINAL VALUES SHOWN
13.8 RX 4 3. SEE TABLES FOR VALUES OF COMPONENTS NOTED &.
4, (208,L209,L210, L211, AND L2I2 ARE FERRITE BEADS PLACED OVER
RY-I oo COMPONENT LEADS.
5. ALL VOLTAGES (FIGURES IN RED) ARE NOMINAL VALUES AS MEASURED
WITH A VTVM, SUPPLY VOLTAGE = 13.8 VDC AT INPUT TO POWER CABLE
= SUPPLIED WITH UNIT.
tiie TMS RANOE a. LETTER FOLLOWING A VOLTAGE INDICATES THE FOLLOWING CONDITIONS :
WICROPHONE SM a ee = UNSQUELCHED
ee ee A ie a $= SQUELCHED - THRESHOLD
> 4> 1 aa T= SQUELCHED- TIGHT
PTT | | OK b. VOLTAGES INDICATED IN TRANSMITTER SECTION ARE MEASURED WITH THE
sw | ae | ey TRANSMITTER IN OPERATION AND CONNECTED TO A PROPER LOAD.
a | | 6. PART NUMBERS INDICATE LOCATION
—>2> 0-99 CHASSIS MOUNTED
J00-I99 RECEIVER BOARD |
i +1> 200-299 TRANSMITTER BOARD
ee wea 4 300-399 LED DISPLAY BOARD
A 400-499 POWER REGULATOR BOARD
caisa~ C24 = aa
\Ouf > .05n¢
= 13,9 + ~-
oe L203
R245
120
c2i7
T201- “A L2o1 L202 & Ne Taz
Gam —9—}2—$< os L208 c2ae R247
c2i9 ar Bae 47K
AR oe88 pods cR206 7)
YCR203 Spaie 31.209 Pe
270 L207 L210
WWI =
c273 y2ol
Olut c2ie
) 90-400
2-18 ain 39
6-9 SCHEMATIC WITH VOLTAGES (BTL-301)
BTL-301 & BTL-304
SECTION 6
6-8 POWER REGULATOR BOARD 302-342 PARTS LIST
Item No. Description Part No.
RESISTORS
R401 3.3K 10% “W 4701-0332-042
R402. ~—- 150 ohms 10% %W 4701-0151-044
R403 —- 150 ohms 10% %W 4701-0151-044
CAPACITORS
C401 .01 uf +80-20% 50V YM (Disc.) 1503-0103-007
C402. ~—_ 01 uf +80-20% 50V YM (Disc.) 1503-0103-007
C403 .01 uf +80-20% 50V YM (Disc.) 1503-0103-007
C404 10 uf 20% 25V TANT 1515-0100-005
C405 150 pf 20% 50V Z5F 1523-0151-002
C406 10 uf 20% 25V TANT 1515-0100-005
C407 .01 uf +80-20% 50V YM (Disc.) 1503-0 103-007
C408 10 uf 20% 25V TANT 1515-0100-005
TRANSISTORS
Q401 Silicon SPS 952 4801-0000-010
Q402 Silicon Power PNP SJE 1608 4802-0000-003
BTL-301 & BTL-304
SECTION 6
T201
ci
Ss
R218
270
c274
Olgt
il
45
Yu3
4.2
RIO9 Rill
clo7 680 180
220 .
102 cao
103 = 78
C101 cus ci22
bed 150 270
e ene 0 a"
~, LIOl I cios 106 § 3.103 Tol B1o8, 68 23
y od 2 a GC) 250
Tk’ L cice \t cis cite
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ciog
= 005,t L
8.2V 8.2
al |G RIS6
o ciso $68
Arcriog | 250] 2w BV
4 ut
3.8
-- Quo RI40
2.2K
3.8 oe ra
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2.2K
Qu2 cl46 12.4 |QI09
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Riss Rise 1000
— t
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ie
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> RI43,
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OSyt
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L201
RI44
L5K
47K
RIB9
1K
Ci33
100ut RI32
RI34 Rak
680
CRIO3
IW
RIZO
47K
Ri2t
cis 8.2K
OlSut
2
i
75K yin’
be FIIOAMP = 13.8 VDC
swi +
OC POWER CORD
GND
RECEIVER
FREQUENCY || CIO! ie [ews [cio clos [ors [ew
cié2
30-35 MHZ|| 33 | 300 12 27 12 | z 2.7 is
220 10 ie | 82 2 22 10
150 82 10 | 82 8.2 22 | 6.2
TRANSMITTER
Ee Co EE) [e jee Se
FREQUENCY || C238 | C235 | C233 | cz30 | C229 | C227 | c226 | c225 | c223 | c222|c221 | c220| c2ig | cz69 | 206 |. 202|c2I7 |c254
a ho J
29-32MHZ || 390 | 680 | 300 | 1000| 360 | 150 | 470 | 220| 100 | 120 | 360 | 390 | 220 | @20 | 300 | 302! 4-6014-60
at +} ~ —
32-35MHZ |} 360 | 560 | 220 | 1000] 300 | 150 | 470 | 220 | 82 | 100 | 270 | 360 | 220 | 820 | 30° | 302 |4 4014-40
aa | 7 = + ae
i=ame 360 | 560 | 220 | 1000] 270} 100 | 360 | 150 | 68 | @2 | 250 | 300 | #2 |1000 | 305 | 302-| 4-40 |4-40
| t — —-—— ~ + ~ —— +—
38-41 MHZ |} 270 | 390 | 200 | 1000/ 250 | 100 | 360 | 150 | 56 | 75 | 200 250| a2 1000 | 30° | 302-1440 |4—40
SS! ae | +———_+ + — —— 4
41-44muHz || 270 | 390 | 150 | 470 | 220] e2 | 360 | 100| 47 | 56 | 180 | 200 | #2 30-| 102 |4-40 | 4-40
| Tee Ar i 302-| 102-
44-47MHZ 180 220 120 470 180 75 360 82 47 sé 150 [= 82 083 742 4-40 <-+0]
= ~— =: et
47-50MHz || 160 | 220 | 120 | 470 | 180 | 75 | 360| e2 | 36 | 47 | 120 | 150] e2 Re | OZ | 4-40 | 4-40
BE 24
BIL-30/
NOTES:
|. ALL CAPACITOR VALUES NOT SPECIFIED ARE PICO-FARAD
ALL RESISTOR VALUES NOT SPECIFIED ARE OHMS, |/4 WATT.
2 QQ NOTED VALUES ARE FACTORY SELECTED. NOMINAL VALUES SHOWN
3. SEE TABLES FOR VALUES OF COMPONENTS NOTED &.
4. 206,L209,L210,L211, AND L2I2 ARE FERRITE BEADS PLACED OVER
COMPONENT LEADS.
5. ALL VOLTAGES (FIGURES IN RED) ARE NOMINAL VALUES AS MEASURED
WITH A VTVM. SUPPLY VOLTAGE = 13.8 VDC AT INPUT TO POWER CABLE
SUPPLIED WITH UNIT.
0. LETTER FOLLOWING A VOLTAGE
= UNSQUELCHED
$= SQUELCHED - THRESHOLD
T= SQUELCHED - TIGHT
INDICATES THE FOLLOWING CONDITIONS
b, VOLTAGES INDICATED IN TRANSMITTER SECTION ARE MEASURED WITH THE
TRANSMITTER
6. PART NUMBERS
0-99
100-199
200-299
300-399
400-499
INDICATE LOCATION
CHASSIS MOUNTED
RECEIVER BOARD
TRANSMITTER BOARD
LED DISPLAY BOARD
POWER REGULATOR BOARD
fe ee
Sanaa = ~
=== i ? ! Y Re | St
PTT | > __joK °
ow H =>: | oS
: u R202 $ c202
| ie: | 100K 3 47
i i
1 : 1
ae a
——
| =
c254 Lau R235
L203
id R225 R231 62k
im 160 too
12.1 L2i2 10.0 10.0
L202B}i3.0 g204 13.0 go05 : 9206 9207 9209
Y T202 XY) cé22 SN) -0.05 225 227 a -0.5 c229 | SYD)
aa bo a ee a ua o 205}
0. A) ay, ay
id Pay 220 { PBEM OR an
F ° If es If °
° c22! 0226 230 233
a 271 o a
390
c269
c2ie
228
90-400 R219 270 224 c
Olt Out R227 232 ‘
27 .Olpt R221 BUA anteee ie Rees Wes ont
L204 | Me
IN OPERATION AND CONNECTED TO A PROPER LOAD
6-9 SCHEMATIC WITH VOLTAGES (BTL-301)
BTL-301 & BTL-304
SECTION 6
*
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RECEIVER
Frequency | ciol |ci0s [ci0s Clos |sios [cts Joise
an
30-25 mnz|] 33 300 12 27 12 22 27 | 15
—~e -~— —— =F 35-44MHZ 22 220 1.0 18 .82 12 2.2 10
crI05 |crios |crio7 4
y
YIOI 44-5OMHZ 15 150 82 [ 10 62 8.2 | 2.2 | 8&2
ee
TRANSMITTER
TT Ts ie oT
FREQUENCY |} C238 | 6235 | C233 | c230 | c229 | c227 | c226 |c225 | c223 | c2ez|czz1 |c220| c2i9 | cz69 |L206 | L202] 217 | c254
Si c = |
Tl =
29-32MHZ 20) 680 | 300 | 1000} 360 | 150 | 470 | 220 | 100 120 | 360 | 390 | 220 | 820 | 205 | 302") 4-60/4-60
4 “ 32-35MHZ || 360 | 560 | 220 | 1000| 300 | 150 | 470 | 220 | 82 | 100 | 270 | 360 | 220 | 820 | 30!- | 302 4-40|4-40
iL g92 | 086 |’
|
35-38mHz || 360 | 560 | 220 [tooo 270 | 100 | 360] 150 | 68 | a2 [22 300 | 82 | 1000 | 30! | 302-| 4 40] 4-40
L302] _LD303|_LD304] A 20) 302
He Ie - +~
38-4! MHZ || 270 | 390 | 200 | 1000] 250 | 100 | 360 | 150 | 56 | 75 | 200| 250] ae | 1000 | 30!-| 302- 4-40 |4-40
L Ie 892 | 086
Fa] Fa 4
370" | |4i-aamuz || 270 | 390 | 150] 470| 220] e2 | 360 | 100] 47 | se 180 | 200 | 82 300} 102 4-40 |4-40
+ + STF —+ a 302- (1021 Ale
R301 44-47MHZ 180 220 120 470 180. 75 360 62 47 56 150 180 82 | 083 | 742 4-40/4-40
ced = 1 al | 302-| 102- |
= 47-SOMHZ || 180 | 220 | 120 | 470 120 | 75 | 360 | 82 | 36 | 47 | 120 | 150 | 62 333 | OZ |4-40|4-40
=I —t | ie a
TL-304
je
NOTES:
1, ALL CAPACITOR VALUES NOT SPECIFIED ARE PICO-FARAD.
| | 13.37X | ALL RESISTOR VALUES NOT SPECIFIED ARE OHMS, |/4 WATT.
13, BRX ea 2. Q NOTED VALUES ARE FACTORY SELECTED, NOMINAL VALUES SHOWN.
3. SEE TABLES FOR VALUES OF COMPONENTS NOTED &,
| RY-I 4. 1208,L209,L2I0,L2I1, AND L2I2 ARE FERRITE BEADS PLACED OVER
COMPONENT LEADS.
5. ALL VOLTAGES (FIGURES IN RED) ARE NOMINAL VALUES AS MEASURED
— WITH A VTVM, SUPPLY VOLTAGE = 13.8 VDC AT INPUT TO POWER CABLE
SUPPLIED WITH UNIT.
| | HIGH IMPEDANCE a, LETTER FOLLOWING A VOLTAGE INDICATES THE FOLLOWING CONDITIONS =
MICROPHONE
U= UNSQUELCHED
$= SQUELCHED - THRESHOLD
T= SQUELCHED - TIGHT
b. VOLTAGES INDICATED IN TRANSMITTER SECTION ARE MEASURED WITH THE
TRANSMITTER IN OPERATION AND CONNECTED TO A PROPER LOAD.
6. PART NUMBERS INDICATE LOCATION
0-99 CHASSIS MOUNTED
100-199 RECEIVER BOARD
200-299 TRANSMITTER BOARD
i 300-399 LED DISPLAY BOARD
| c2i4 +j 400-499 POWER REGULATOR BOARD
11 O5ut
|
| =
WI
| C2i7
| T201 nx 1201
o Saar Bsa
i SWIRLS J. sW2A __ /-SW3A ___/ Sw4a
C255
47 A
Ycr203 R2i8
Bie Co y2o01 Coy202 CJy203 Cjy204
c273
Out
c246 c248 c250
2-18 218 2-18
249 C25
{ ea E Te
Lear
“T> Olut
L +=
6-10 SCHEMATIC WITH VOLTAGES (BTL-304)
BTL-301 & BTL-304 -10- SECTION 6
oo my
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aA y
4 hrs
=
eet es,
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220 | {
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220
RECEIVER
I
[rrcavencr fcr |c1oz [cio [eros ]e10s |c10s Jers [ese
30-35 wnz| 33 300 12 27 12
35-44MHZ|/ 22 | 220 | 1.0
|
|
22
82 2 22 10
a2
‘6
| 44-SOMHZ|| 15 150 82 1” | 82
TRANSMITTER
=
r — T T r
Frequency c236 = C233 | c230 [czzs C227 | C226 | C225 | C223 | c222 | c221 | c220
160
= =
29-32MHZ 390 | 680 | 300 | 1000] 3
7 —7
| 32-35 MHZ 360 | 560 | 220 | 1000/ 300
I =
35-38 MHZ 360 | 560 | 220 | 1000} 270
| +
| 36-41 MHZ 270 | 390 | 200 | 100/ 250
41-44MHZ || 270 350 | 150 | 470 | 220
44-47MHZ [ 180 | 220 | 120 | 470 | 160
pee) 180 | 220 | 120 | 470 | 180
BTL-304
ALL CAPACITOR VALUES NOT SPECIFIED ARE PICO-FARAD.
ALL RESISTOR VALUES NOT SPECIFIED ARE OHMS, I/4 WATT
2 Q& NOTED VALUES ARE FACTORY SELECTED. NOMINAL VALUES SHOWN.
3. SEE TABLES FOR VALUES OF COMPONENTS NOTED @.
4 (208,L209,L210,L2I, AND L2I2 ARE FERRITE BEADS PLACED OVER
COMPONENT LEADS.
5. ALL VOLTAGES (FIGURES IN RED) ARE NOMINAL VALUES AS MEASURED
WITH A VTVM, SUPPLY VOLTAGE = [3.8 VDC AT INPUT TO POWER CABLE
SUPPLIED WITH UNIT.
9. LETTER FOLLOWING A VOLTAGE INDICATES THE FOLLOWING CONDITIONS
U= UNSQUELCHED
S= SQUELCHED - THRESHOLD
T= SQUELCHED - TIGHT
b. VOLTAGES INDICATED IN TRANSMITTER SECTION ARE MEASURED WITH THE
TRANSMITTER IN OPERATION AND CONNECTED TO A PROPER LOAD
6. PART NUMBERS INDICATE LOCATION
O-ss CHASSIS MOUNTED
100-199 RECEIVER BOARD
200-299 TRANSMITTER BOARD
300-399 LED DISPLAY BOARD
400-499 POWER REGULATOR BOARD
RON RES ae gs ye pg Ny a a er ep ea pee ee |
O
; laut 150
6-10 SCHEMATIC WITH VOLTAGES (BTL-304)
BTL-301 & BTL-304
SECTION 6
~~
4
.
i
aay
SECTION 7 SERVICE MANUAL ADDENDUM
The following modifications now exist in the (BTL-301 and BTL -304)
VHF FM Transceivers. The revisions pertain to the Transmitter Board 500-996.
Effective October, 1974.
ADDENDUM CONTENTS
1 Text revisions
-2 Component revision to Transmitter Board 500-996
3 Transmitter Board Parts Placement Diagram
-4 Transmitter Board Parts Overlay Diagram
5 Schematic with Voltages (BTL-301)
-6 Schematic with Voltages (BTL-304)
7-1 TEXT REVISIONS
SECTION 3
Transmitter tuning procedure is the same as described in Section 3 except for
the following changes:
Page 5
3-7-6 Modulator Alignment
a. Connect the common lead of the VTVM to the A+ buss in the trans -
mitter (Junction of R237, R231, etc.).
b. Connect the probe of the VTVM to the Junction of R237 and T206,
(TP 6).
c. Tune the core of L206 for peak on the VTVM (maximum voltage drop
across R237). Normal voltage is -0.8 volts.
3-7-7 T206: The common lead of the VTVM is left connected to the A+ buss
during the remainder of the alignment. Before proceeding, back all of
the bottom cores of transformers T202 through T206 until the cores are
flush with the bottom of the P.C. Board. Connect the VTVM probe to the
Junction of R231 and T205 (TP 7). Tune the primary (top core) of T206
for a peak reading on the VTVM (max. voltage drop across R231), and
then adjust the bottom core of T206 for a peak reading. Normal voltage
is -1.8 volts. In adjusting T203 through T206, the secondary (top core)
is first peaked with the primary (bottom core) backed out of its winding ,
and then the primary is tuned. It is then permissable to peak both slugs.
BTL - 301 & BTL - 304 a= SECTION 7
Page 6
3-7-8 205: Connect the VIVM probe to the Junction of R225 and T204 (TP 8). (€
Adjust the secondary core and then the primary core for a peak reading
on the VTVM as in 5a. above. Normal voltage is -3.5 volts.
3-7-9 T204: Connect the VIT'VM probe to the Junction of R223 and T203 (TP 9).
Adjust the secondary core and then the primary core for a peak reading
as in 5a. above. Return to T205 and repeak the secondary and primary
for peak reading at (TP 9). Repeak T204 for maximum reading at (TP 9).
Repeat the tuning of T205 and T204 until a maximum peak is obtained at
(TP 9). Normal voltage is -1.2 volts.
Steps 3-7-10 and 3-7-11 appear in this Section and Section 6-1. Replace them
both with the following steps:
3-7-10 T203: Connect the VTVM probe to the Junction of R220 and T302 (TP 10).
Adjust the secondary and primary cores of T203 as in 5a. above. Nore
mal voltage is -0.1 volts at (TP 10).
€
BTL - 301 & BTL -304 -2- | SECTION 7
7-2 TRANSMITTER BOARD 500-996
Item No. Description Part No.
RESISTORS
All Resistors are +10%, “W, unless otherwise noted.
R201 10K
R202 100K
R203 10K
R204 Trimmery, 10K 4751-0103-001
R205 3.9K
R206 2.7K
R207 6.8K
R208 68K
R209 18K
R210 470 ohm
R211 10K
R212 39K
R213 120K
R214 27K
R215 39K
R216 Trimmer, 10K 4751-0103-001
R217 470 ohm
R218 330 ohm, 5%
R219 10 ohm (29-47 MHz)
15 ohm (47-50 MHz)
R220 3.2 ohm 4701-0339-042
R221 18 ohm
R222 10 ohm
R223 10 ohm
R224 22 ohm
R225 100 ohm
R226 47 ohm
R227 270 ohm
R228 470 ohm (29-32 MHz)
680 ohm (32-35 MHz)
820 ohm (35-38 MHz)
1.5K ohm (38-41 MHz)
1.8K ohm (41-44 MHz)
2.2K ohm (44-47 MHz)
2.7K ohm (47-50 MHz)
R229 TOK
R230 10 ohm
R231 100 ohm
R235 82K
R236 4.7K
R237 100 ohm
R238 150 ohm
R239 27K
R240 2.7K
R241 100 ohm, 1\W, 10% 4701-0101-042
R242 68K
R243 100K
R244 100K
R245 120 ohm
R246 180 ohm
R247 47K
R248 27K
R250 150 ohm
BTL-301 & BTL-304
item No. Description
CAPACITORS
C201 .01mf, 10%, 100V (Mylar Film)
C202 47pf, 5%, 50V (Mica)
C203 10mf, 85°C, 10V (Electrolytic)
C204 -Imf, 20%, 12V (Disc.)
C205 25mf, 85°C, 10V (Electrolytic)
C206 47mf, +80 -20%, 3V (Disc.)
C207 .Imf, 20%, 12V (Disc.)
C208 .0033mf, 10%, 100V (Mylar Film)
C209 .022mf, 10%, 100V (Mylar Film)
C210 .imf, 20%, 12V (Disc.)
C21 A7mf, +80 -20%, 3V (Disc.)
C212 -Imf, 20%, 12V (Disc.)
G2138 .O1mf, +80 -20%, 16V (Disc.)
C214 .05mf, +80 -20%, 16V (Disc.)
C215 10mf, 20%, 25V (Tantalum)
C217 4-40pf MICA Trimmer (38-50 MHz)
4-60pf MICA Trimmer (29-38 MHz)
C218 90-400pf, MICA Trimmer
C219 470pf, 5%, 500v,MICA (29-32 MHz)
390pf, 5%, 500v,MICA (32-35 MHz)
300pf, 5%, 500v,MICA (35-38 MHz)
270pf, 5%, 500v,MICA (38-41 MHz)
220pf, 5%, 500v,MICA (41-44 MHz)
180pf, 5%, 500v,MICA (44-47 MHz)
150pf, 5%, 500v,MICA (47-50 MHz)
C220 390pf, 5%, 500V MICA (29-32 MHz)
360pf, 5%, 500V MICA (32-35 MHz)
300pf, 5%, 500V MICA (35-38 MHz)
250pf, 5%, 500V MICA (38-41 MHz)
200pf, 5%, 500V MICA (41-44 MHz)
180pf, 5%, 500V MICA (44-47 MHz)
150pf, 5%, 500V MICA (47-50 MHz)
C221 300pf, 5%, 50v MICA (29-32 MHz)
250pf, 5%, 50v MICA (32-35 MHz)
200pf, 5%, 50v MICA (35-38 MHz)
180pf, 5%, 50v MICA (38-41 MHz)
150pf, 5%, 50v MICA (41-44 MHz)
120pf, 5%, 50v MICA (44-47 MHz)
100pf, 5%, 50v MICA (47-50 MHz)
C222 120pf, 5%, 50V MICA (29-32 MHz)
100pf, 5%, 50V MICA (32-35 MHz)
82pf, 5%, 50V MICA (35-38 MHz)
75pf, 5%, 5OV MICA (38-41 MHz)
56pf, 5%, 50V MICA (41-47 MHz)
47pf, 5%, 50V MICA (47-50 MHz)
C223 100pf, 5%, 50V MICA (29-32 MHz)
82pf, 5%, 50v MICA (32-38 MHz)
56pf, 5%, 50V MICA (38-41 MHz)
A47pf, 5%, 50V MICA (41-47 MHz)
36pf, 5%, 50V MICA (47-50 MHz)
C224 .01, +80 -20%, 16V (Disc.)
G225 220pf, 5%, 50V MICA (29-35 MHz)
150pf, 5%, 50V MICA (35-41 MHz)
100pf, 5%, 50V MICA (41-44 MHz)
82pf, 5%, 50V MICA (44-50 MHz)
Part No.
1508-0103-610
1507-0470-001
1513-0100-001
1502-0104-005
1513-0250-001
1502-0474-001
1502-0104-005
1508-0332-610
1508-0223-610
1502-0104-005
1502-0474-001
1502-0104-005
1502-0103-003
1502-0503-003
1515-0100-005
1517-0000-009
151 7-0000-005
1517-0000-008
1504-0471-505
1504-0391-505
1504-0301 -505
1504-0271-505
1504-0221 -505
1504-0181-505
1504-0151-505
1504-0391-505
1504-0361-505
1504-0301-505
1504-0251-505
1504-0201-505
1504-0181-505
1504-0151-505
1506-0301-550
1506-0251-550
1506-0201-550
1506-0181-550
1506-0151-550
1506-0121-550
1506-0101-550
1506-0121-550
1506-0101-550
1506-0820-550
1506-0750-550
1506-0560-550
1506-0470-550
1506-0101-550
1506-0820-550
1506-0560-550
1506-0470-550
1506-0360-550
1502-0103-003
1506-0221-550
1506-0151-550
1506-0101-550
1506-0820-550
SECTION 7
re
Item No.
Description
Part No.
ED
C228
C229
C230
C231
C232
C233
C235
C236
C237
C238
C239
C240
C241
C242
C243
C244
C246
C247
*C248
*c249
*C250
*C251
*C252
*C253
CAPACITORS
470pf, 5%, 50V MICA (29-35 MHz)
360pf, 5%, 50V MICA (35-50 MHz)
150pf, 5%, 50V MICA (29-35 MHz)
100pf, 5%, 50V MICA (35-41 MHz)
82pf, 5%, 50V MICA (41-44 MHz)
75pf, 5%, 50V MICA (44-50 MHz)
.01, +80 -20%, 16V (Disc.)
360pf, 5%, 50V MICA (29-32 MHz)
300pf, 5%, 50V MICA (32-35 MHz)
270pf, 5%, 50V MICA (35-38 MHz)
250pf, 5%, 50V MICA (38-41 MHz)
220pf, 5%, 50V MICA (41-44 MHz)
180pf, 5%, 50V MICA (44-50 MHz)
1000pf, 5%, 50V MICA (29-41 MHz)
470pf, 5%, 50V MICA (41-50 MHz)
.005mf, +80 -20%, 500V Z5U (Disc.)
.Oimf, +80 -20%, 16V (Disc.)
300pf, 5%, 50V MICA (29-32 MHz)
220pf, 5%, 50V MICA (32-38 MHz)
200pf, 5%, 50V MICA (38-41 MHz)
150pf, 5%, 50V MICA (41-44 MHz )
120pf, 5%, 50V MICA (44-50 MHz)
680pf, 5%, 50V MICA (29-32 MHz)
560pf, 5%, 50V MICA (32-38 MHz)
390pf, 5%, 50V MICA (38-44 MHz)
220pf, 5%, 50V MICA (44-50 MHz)
100pf, 5%, 50V (Mica)
.O1mf, +80 -20%, 16V (Disc.)
390pf, 5%, 50V MICA (29-32 MHz)
360pf, 5%, 50V MICA (32-38 MHz)
270pf, 5%, 50V MICA (38-44 MHz)
180pf, 5%, 50V MICA (44-50 MHz)
mf, 20%, 12V (Disc.)
27pf, 10%, 500V, NPO (Disc.)
5pf, 10%, 500V NPO (Disc.)
Amf, 20%, 12V (Disc.)
150pf, 5%, 50V (Mica)
Same as C243
2-18pf, Trimmer
39pf, 50v, 5% 00-580
Same as C246
Same as C247
Same as C246
Same as C247
Same as C246
Same as C247
C254 4-6O0pf MICA Trimmer (29-38 MHz)
C254 4-40pf, MICA Trimmer (38-50 MHz)
C255
C269
C270
C271
A7pf, 5%, 500V (Mica)
300pf, 5%, 500v MICA (29-38 MHz)
270pf, 5%, 500v MICA (38-41 MHz)
1000pf, 5% 500v MICA (41-44MHz)
180pf, 5%, 500v MICA (44-47 MHz)
150pf, 5%, 500v MICA (47-50 MHz)
001 mf, +80 -20%, 50v (DISC)
390pf, 5%, 50v MICA (47-50 MHz)
560pf, 5%, 50v MICA (29-47 MHz)
BTL-301 & BTL-304
1506-0471-550
1506-0361-550
1506-0151-550
1506-0101-550
1506-0820-550
1506-0750-550
1502-0130-003
1506-0361-550
1506-0301-550
1506-0271-550
1506-0251-550
1506-0221-550
1506-0181-550
1507-0102-004
1506-0471-550
1503-0502-002
1502-0103-003
1506-0301-550
1506-0221-550
1506-0201-550
1506-0151-550
1506-0121-550
1506-0681-550
1506-056 1-550
1506-0391-550
1506-0221-550
1507-0102-004
1502-0103-003
1506-0391-550
1506-036 1-550
1506-0271-550
1506-0181-550
1502-0104-005 -
1500-0270-605_
1500-0050-905
1502-0104-005
1506-0151-550
1517-0000-001
1500-0390-550
151 7-0000-005
151 7-0000-009
1504-0470-505
1504-0301 -505
1504-0271-505
1504-0102-505
1504-0181-505
1504-0151-505
1503-0102-003
1506-0391-550
1506-0561-550
Item No. Description Part No.
; C272 .0047mf, 10%, 100V (Mylar Film) 1508-0472-610
C273 .01 uf, +80-20%, 50V, YM (Disc.) 1503-0103-007
C274 .01 uf, +80-20%, 50V,YM (Disc.) 1503-0103-007
C275 .01 uf, +80-20%, 50V, YM (Disc.) 1503-0103-007
C276 .01 uf, +80-20%, 50V, YM (Disc.) 1503-0103-007
C277 ~—«-200pf, 5%, 50v MICA (29-35 MHz) ~—': 1506-0201-550
100pf, 5%, 50v MICA (35-50 MHz) 1506-0101 -550
*Used on BTL-304 ONLY
| COILS
| L201 Coil Final Output (29-35 MHz) 1801-3240-400
Coil Final Output (35-41 MHz) 1801-3208-700
Coil Final Output (41-50 MHz) 1801-3219-600
L202 Coil, Antenna Output (29-41 MHz) 1801-3208-600
Coil, Antenna Output (41-50 MHz) 1801-1274-201
L203 Coil, RF Choke 1803-3189-800
L204 Choke Bead Coil 1803-1245-900
L206 Coil, Modulator (29-41 MHz) 1800-3189-200
Coil, Modulator (41-50 MHz) 1800-3208-300
L208 Ferrite Bead 2502-0000-001
L209 Same as L208
L210 Same as L208
L211 Same as L208
L212 Same as L208
7201 Transformer, SWR Bridge 1800-3190-100
T202 Transformer, Driver (Violet) 1800-3189-701
T203 Transformer (Blue) 1800-3189-601
T204 Transformer (Green) 1800-3189-501
T205 Transformer (Yellow) 1800-3189-401
T206 Transformer (Orange) 1800-3189-301
TRANSISTORS
Q201 Junct. FET 481 1-0000-030
Q202 Silicon NPN 4801-0000-010
Q203 Same as Q202
Q204 Silicon, RF Power NPN 4804-3169-503
Q205 Silicon, RF Power NPN 4804-3169-604
Q206 Silicon NPN 4804-0000-015
Q207 Silicon NPN (BT) 4801-0000-003
Q208 Silicon NPN 4801-0000-010
Q209 Silicon NPN (BT) 4801-0000-003
Q211 Silicon NPN (BT) 4801-0000-003
Q212 Same as 0211 5
NOTE: BT=Blue Top
INTEGRATED CIRCUITS
1C201 IC, Divider 3130-3157-607
Shibld, |.C. 2508-1 265-900
—4- SECTION 7
BTL - 301 & BTL - 304
TRANSMITTER BOARD 500-996
7-3 TRANSMITTER BOARD PARTS PLACEMENT DIAGRAM
SECTION 7
TRANSMITTER BOARD_500-996
7-4 TRANSMITTER BOARD PARTS OVERLAY DIAGRAM
BTL - 301 & BTL - 304 -6- SECTION 7
=|
clot jclio2 ows ]1os [cios |cios cis! | cis2
300} 12 ee 12 | 22 2.7: 1S
220 1.0 is 82 12 2.2 o|
150 | .62 | 10 82 8.2 8.2
_—7 —
C235 | C233 czz0] C229 | C227 cats [ozes 223 | c222|c221 | c220 | c2i9 [zee L206
30 00
eso | 10 | 1000 | 360 | 150
301-
120 | 300 | 390 | 470 | 3 92
100 | 250 | 360 | 390 | 300 | 30l-
62 | 200 300 | 300 | 300
—.
390 | 200 | 1000} 250 75 180 | 250 | 270 |270
390 | 150 | 470 | 220 56 150 | 200 | 220 | 1000
220 | 120 | 470 | I80 56 120 | 180 | 180 | 180
220 | 120 | 470 | 1860
" BTL-30/
PACITOR VALUES NOT SPECIFIED ARE PICO-FARAD.
SISTOR VALUES NOT SPECIFIED ARE OHMS, I/4 WATT.
D VALUES ARE FACTORY SELECTED. NOMINAL VALUES SHOWN.
BLES FOR VALUES OF COMPONENTS NOTED &,
R09,L210,L2I1, AND L2I2 ARE FERRITE BEADS PLACED OVER
ENT LEADS.
TAGES (FIGURES IN RED) ARE NOMINAL VALUES AS MEASURED
VTVM, SUPPLY VOLTAGE = 13.8 VDC AT INPUT TO POWER CABLE
D WITH UNIT. .
TTER FOLLOWING A VOLTAGE INDICATES THE FOLLOWING CONDITIONS :
UNSQUELCHED
SQUELCHED ~ THRESHOLD
SQUELCHED - TIGHT
LTAGES INDICATED IN TRANSMITTER SECTION ARE MEASURED WITH THE
ANSMITTER IN OPERATION AND CONNECTED TO A PROPER LOAD.
IMBERS INDICATE LOCATION
CHASSIS MOUNTED
RECEIVER BOARD
TRANSMITTER BOARD
LED DISPLAY BOARD
POWER REGULATOR BOARD
47 100 | 150 | 150 | ISO
+
C215: c2i¢
lOut Sut
L201
ee R247
rt 47K
C255 eBi2
47 DTD
¥ CR 203 Res L209 ie
Bi
+ 7 L210
c273 é
Olut C243 CoJyeoi
1507
R246 R248
0244
180 ian 27K
c246 C247
; 2-18 39
7 - 5 SCHEMATIC WITH VOLTAGES (BTL - 301)
BTL - 301 & BTL - 304 <1:
SECTION 7
TRANSMITTER BOARD 500-996 _
7-4 TRANSMITTER BOARD PARTS OVERLAY DIAGRAM
BTL - 301 & BTL - 304 -6- SECTION 7
RIO4
Qi03
RECEIVER
a Me [eve cs [eves CIOS |Clos | CiISi | CIS2
]
HEB Re
DC POWER CORD 41-44MHZ
TRANSMITTER
iy in
FREQUENCY || C238 | C235 | c233 | c230 | c229 | c227 | c226 | czes | c223 | c222 | c221 czz0] ca C269 | L206 |. 202|c2i7 |c2s4|c277\c271 | R2I9 | R228). 201
= ie isc be | pe eal a be ete
es | zy = = ? 302
Bo. 29-32MnHz || 390 80 | 300 1000 | 360 | 150 | 470 | 220] 100 | 120 | 300 | 390 | 470 | 300 | 30! | 302) 4 6p 200 |s60 | | 470 | 08
=e L es2 | 086
32-35 MHZ 4
1
FIIOAMP 13.8 voc 35-38 MHZ
earl]
38-41 MHZ
GNO 47-
2.
3.
4
C402 j24 C403
Olpt Oluf 5.
6.
NOTES:
ALL CAPACITOR VALUES NOT SPECIFIED ARE PICO-FARAD.
ALL RESISTOR VALUES NOT SPECIFIED ARE OHMS, |/4 WATT.
& NOTED VALUES ARE FACTORY SELECTED. NOMINAL VALUES SHOWN.
SEE TA3LES FOR VALUES OF COMPONENTS NOTED @.
208,209,210, L2i,
COMPONENT LEADS.
AND L2/2 ARE FERRITE BEADS PLACED OVER
ALL VOLTAGES (FIGURES IN RED) ARE NOMINAL VALUES AS MEASURED
WITH A VTVM. SUPPLY VOLTAGE = 13.8 VDC AT INPUT TO POWER CABLE
SUPPLIED WITH UNIT.
6. LETTER FOLLOW
= UNSQUELCHED
ING A VOLTAGE INDICATES THE “FOLLOWING CONDITIONS :
S* SQUELCHED - THRESHOLD
T= SQUELCHED — TIGHT
b, VOLTAGES INDICATED IN TRANSMITTER SECTION ARE MEASURED WITH THE
TRANSMITTER IN
OPERATION AND CONNECTED TO A PROPER LOAD.
PART NUMBERS INDICATE LOCATION
0-99 CHASSIS MOUNTED
100-199 RECEIVER BOARD
200-298 TRANSMITTER BOARD
300-398 LED DISPLA’
'Y BOARD
400-499 POWER REGULATOR BOARD
R245
c274
Olgt
7 - 5 SCHEMATIC WITH VOLTAGES (BTL - 301)
BTL - 301 & BTL - 304
SECTION 7
a
_—
101 jC102 |ClIO3 | CIOS | CIOS | clos | CIS! | cis2
230 | 229 | c227 | c226 | c225 | c223 | ce22|c221 |c220 cave | caso]
= lt
1000 470
1000 390
(000 300
tooo 270
470 220
470 180 | 180 | O65
302-| 102-
470 150 | 150 | O83 | 742-1
8TL- 304
ferton VALUES NOT SPECIFIED ARE PICO-FARAD.
TOR VALUES NOT SPECIFIED ARE OHMS, |/4 WATT.
VALUES ARE FACTORY SELECTED. NOMINAL VALUES SHOWN.
—S FOR VALUES OF COMPONENTS NOTED .
,L2I0,L21, AND L2I2 ARE FERRITE BEADS PLACED OVER
iT LEADS.
GES (FIGURES IN RED) ARE NOMINAL VALUES AS MEASURED
TVM, SUPPLY VOLTAGE = 13.8 VDC AT INPUT TO POWER CABLE
WITH UNIT.
ER FOLLOWING A VOLTAGE INDICATES THE FOLLOWING CONDITIONS :
INSQUELCHED
IQUELCHED - THRESHOLD
QUELCHED — TIGHT
(AGES INDICATED IN TRANSMITTER SECTION ARE MEASURED WITH THE
ISMITTER IN OPERATION AND CONNECTED TO A PROPER LOAD.
BERS INDICATE LOCATION
CHASSIS MOUNTED
RECEIVER BOARD
TRANSMITTER BOARD
LED DISPLAY BOARD
POWER REGULATOR BOARD
HIGH IMPEDANCE
MICROPHONE
10K
CJ y2o1
Olut
ae ae |
7 -6 SCHEMATIC WITH VOLTAGES (BTL - 304)
BTL - 301 & BTL - 304 87) SECTION 7
a
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|
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|
|
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T2018
cr203
c27s
Dist
13.3 TX i
13. 6Rx
Ry-1
R302
470
L7™
88
385
RI46
mrs
RUT
33
YU3
Rue
'
RIOg Rill
680 180
—7 |
ciz0
tJ RIS Ices :
" 1.5K 270 tos!
ize lei» 6t08 |
270 (ie \as Hl
RO 3 L106 \
8.6K C123 us —
250 ci24
0.4 em
pt 047 ut
TRA.
ray
Ria c140 awe IE
22K .047 pt nee 683,
RI26 $RIZ4
gat (eee
‘Q105 Ci35
O15ut
2000 e; 3
a) RI23
RI26 | 19 pole
RI48
CI36 S1.8K
O47 pt
- +
Fl loamP 13.8 voc
Nee
+
l Dc POWER CORD
eo eer
R
BR
R203 + QR208 6.8K
205
OK ce04 25yf bt
a 9201 4 ats 6
oO 201 oor 0 47 ut 7
ae R204 y-4
Y 10K WA
R202 & C202 Ss 2
OOK 3 47 a naoe R210
+1_c2o3 R205 are
1Ouf 3.9K
c2i6 = =
Sut
= ;
c254 Lau
L203
s R223
c2i7 Pl Lai2
L201 L202 OB bo 9204 13.0 9205 " 9206
T202 céze Te SS Nioos
#7 = ay
C255 20
o) c220 ! cy 10.2
id °
e cei 1.9
bo] c27i
2
cae
c2is
Fa c224
Cece -Oluf $R222 $R224
10 22
R219 C270
. -O0\pf R221
L204 | 8
RECEIVER
FREQUENCY ||ciOi |CiO2 | C103 |CclO4 cies [oe [eis [oise
l2 | 27 15
30-35 MHZ|| 33 300 12 22 27
35-44MHZ|} 22 | 220 10 ‘ 82 2 22 10
44-SOMHZ
TRANSMIT TER
[Frequency |= = c220 | c219
L202/ C2i7 | ces4
29-32MHZ
32-35MHZ
41-44MHZ
Bite Kemet
44-47unz | 470 | 180 | 75 | 360] e2 | 47 | 56 | 120 | 180 | 180
[+7-somez 470 | wo | 75 | 360 | a2 | 36 | 47 re 150 | iso | 150 = Pee
BIL-304
NOTES:
\. ALL CAPACITOR VALUES NOT SPECIFIED ARE PICO-FARAD.
ALL RESISTOR VALUES NOT SPECIFIED ARE OHMS, |/4 WATT.
2. Q& NOTED VALUES ARE FACTORY SELECTED. NOMINAL VALUES SHOWN
3. SEE TABLES FOR VALUES OF COMPONENTS NOTED OQ.
4 1206,L209,1210,L211, AND L2I2 ARE FERRITE BEADS PLACED OVER
COMPONENT LEADS.
5. ALL VOLTAGES (FIGURES IN RED) ARE NOMINAL VALUES AS MEASURED
WITH A VTVM. SUPPLY VOLTAGE = [3.6 VDC AT INPUT TO POWER CABLE
SUPPLIED WITH UNIT.
@. LETTER FOLLOWING A VOLTAGE INDICATES THE FOLLOWING CONDITIONS
= UNSQUELCHED
$* SQUELCHED - THRESHOLD
T= SQUELCHED ~ TIGHT
b. VOLTAGES INDICATED IN TRANSMITTER SECTION ARE MEASURED WITH THE
TRANSMITTER IN OPERATION AND CONNECTED TO A PROPER LOAD.
6. PART NUMBERS INDICATE LOCATION
0-99 CHASSIS MOUNTED
100-199 RECEIVER +BOARD
200-299 TRANSMITTER BOARD
300-399 LED DISPLAY BOARD
400-499 POWER REGULATOR BOARD
7-6 SCHEMATIC WITH VOLTAGES (BTL - 304)
BTL - 301 & BTL - 304
SECTION 7
ey
“I 7 i
At iy
SECTION 8 SERVICE MANUAL ADDENDUM
The following modifications now exist in the BT L-301 and BTL-304 VHF
FM Transceivers. The revisions pertain to the Transmitter Board 501-183
on which the power regulator components are now located. Effective April, —
thee
ADDENDUM CONTENTS
1 Cross Reference To Power Regulator Board
-2 Component List To: Transmitter Board 501-183
-3 Transmitter Board Parts Placement Diagram
4 Transmitter Board Parts Overlay Diagram
9 Receiver Board Parts Placement Diagram
-6 Receiver Board Parts Overlay Diagram
7 Schematic with Voltages (BT L-301/304)
8-1 CROSS REFERENCE TO POWER REGULATOR BOARD
This manual revision reflects the relocation of the power regulator circuit
on the transmitter board. The circuit is the same as shown in Section 6. Below
is a cross reference listing the new circuit symbols.
CROSS REFERENCE
901-183 TRANSMITTER BOARD
POWER REGULATOR BOARD 302-342 PARTS LIST
Item No. Description Part No.
Item #
RESISTORS
R401 3.3K 10% %W 4701-0332-042 R251
R402 150 ohms 10% %W 4701-0151-044 R2ods4
R403. =: 150 ohms 10% %W 4701-0151-044 R253
CAPACITORS
C278
C401 .01 uf +80-20% 50V YM (Disc.) 1503-0103-007
C402 —-.01 uf +80-20% 50V YM (Disc.) 1503-0103-007 C279
C403. ~—_ .01 uf +80-20% 50V YM (Disc.) 1503-0103-007 C280
C404 10 uf 20% 25V TANT 1515-0100-005 C281
C405 ~—_: 150 pf 20% 50V Z5F 1523-0151-002 C282
C406 ~=—-: 10 uf 20% 25V TANT 1515-0100-005
C407 _.01 uf +80-20% SOV YM (Disc.) 1503-0103-007 C283
C408 10 uf 20% 25V TANT 1515-0100-005 C284
C285
TRANSISTORS
Q401 Silicon SPS 952 4801-0000-010 Q210
Q402 Silicon Power PNP SJE 1608 4802-0000-003 Q2 13
All tuning procedures remain as described in Section 7 and 6. This
section contains transmitter board and receiver board parts placement
diagrams with wire tie points cross referenced to the schematic diagrams.
BTL-301 & BTL-304 -1- SECTION 8
8-2 TRANSMITTER BOARD 501-183
ES
Part No.
4751-0103-001
Item No. Description
RESISTORS
All Resistors are +10%, %W, unless otherwise noted.
R201 10K
R202 100K
R203 10K
R204 Trimme;y, 10K
R205 3.9K
R206 2.7K
R207 6.8K
R208 68K
R209 18K
R210 470 ohm
R211 10K
R212 39K
R213 120K
R214 27K
R215 39K
R216 Trimmer, 10K
R217 470 ohm
R218 330 ohm, 5%
R219 10 ohm (29-47 MHz)
15 ohm (47-50 MHz)
R220 3.3 ohm
R221 18 ohm
R222 10 ohm
R223 10 ohm
R224 22 ohm
R225 100 ohm
R226 47 ohm
R227 270 ohm
R228 470 ohm (29-32 MHz)
680 ohm (32-35 MHz)
820 ohm (35-38 MHz)
1.5K ohm (38-41 MHz)
1.8K ohm (41-44 MHz)
2.2K ohm (44-47 MHz)
2.7K ohm (47-50 MHz)
R229 1.5K
R230 10 ohm
R231 100 ohm
R235 82K
R236 4.7K
R237 100 ohm
R238 150 ohm
R239 DiI
R240 2.7K
R241 100 ohm, 1W, 10%
R242 100K
R243 68K
R244 100K
R245 120 ohm
R246 180 ohm
R247 47K
R248 27K
R250 150 ohm
R251 3.3K
R252 150 ohm, ZW 10%
R253 150 ohm, ZW 10%
BTL-301 & BTL-304
4751-0103-001
4701-0339-042
4701-0101-042
4701-0151 -044
4701-0151-044
ES
Item No. Description
CAPACITORS
C201 .O1mf, 10%, 100V (Mylar Film)
C202 47pf, 5%, 50V (Mica)
C203 10mf, 85°C, 10V (Electrolytic)
C204 mf, 20%, 12V (Disc.)
C205 25mf, 85°C, 10V (Electrolytic)
C206 A7mf, +80 -20%, 3V (Disc.)
C207 .Imf, 20%, 12V (Disc.)
C208 .0033mf, 10%, 100V (Mylar Film)
C209 .022mf, 10%, 100V (Mylar Film)
C210 .imf, 20%, 12V (Disc.)
C211 A7Tmf, +80 -20%, 3V (Disc.)
C212 mf, 20%, 12V (Disc.)
C213 .O1imf, +80 -20%, 16V (Disc.)
C214 .05mf, +80 -20%, 16V (Disc.)
C215 10mf, 20%, 25V (Tantalum)
C217 4-40pf MICA Trimmer (38-50 MHz)
4-60pf MICA Trimmer (29-38 MHz)
C218 90-400pf, MICA Trimmer
C219 470pf, 5%, 500v,MICA (29-32 MHz)
390pf, 5%, 500v,MICA (32-35 MHz)
300pf, 5%, 500v,MICA (35-38 MHz)
270pf, 5%, 500v,MICA (38-41 MHz)
220pf, 5%, 500v,MICA (41-44 MHz)
180pf, 5%, 500v,MICA (44-47 MHz)
150pf, 5%, 500v,MICA (47-50 MHz)
C220 390pf, 5%, 500V MICA (29-32 MHz)
360pf, 5%, 500V MICA (32-35 MHz)
300pf, 5%, 500V MICA (35-38 MHz)
250pf, 5%, 500V MICA (38-41 MHz)
200pf, 5%, 500V MICA (41-44 MHz)
180pf, 5%, 500V MICA (44-47 MHz)
150pf, 5%, 500V MICA (47-50 MHz)
C221 300pf, 5%, 50v MICA (29-32 MHz)
250pf, 5%, 50v MICA (32-35 MHz)
200pt, 5%, 50v MICA (35-38 MHz)
180pf, 5%, 50v MICA (38-41 MHz)
150pf, 5%, 50v MICA (41-44 MHz)
120pf, 5%, 50v MICA (44-47 MHz)
100pf, 5%, 50v MICA (47-50 MHz)
C222 120pf, 5%, 50V MICA (29-32 MHz)
100pf, 5%, 50V MICA (32-35 MHz)
82pf, 5%, 50V MICA (35-38 MHz)
75pf, 5%, 50V MICA (38-41 MHz)
56pf, 5%, 50V MICA (41-47 MHz)
A7pf, 5%, 50V MICA (47-50 MHz)
G23 100pf, 5%, 50V MICA (29-32 MHz)
82pf, 5%, 50v MICA (32-38 MHz)
56pf, 5%, 50V MICA (38-41 MHz)
47pf, 5%, 50V MICA (41-47 MHz)
36pf, 5%, 50V MICA (47-50 MHz)
C224 .01, +80 -20%, 16V (Disc.)
C225 220pf, 5%, 50V MICA (29-35 MHz)
150pf, 5%, 50V MICA (35-41 MHz)
100pf, 5%, 50V MICA (41-44 MHz)
82pf, 5%, 50V MICA (44-50 MHz)
2.
Part No.
1508-0103-610
1507-0470-001
1513-0100-001
1502-0104-005
1513-0250-001
1502-0474-001
1502-0104-005
1508-0332-610
1508-0223-610
1502-0104-005
1502-0474-001
1502-0104-005
1502-0103-003
1502-0503-003
1515-0100-005
1517-0000-009
1517-0000-005
1517-0000-008
1504-0471-505
1504-0391-505
1504-0301-505
1504-0271-505
1504-0221-505
1504-0181-505
1504-0151-505
1504-0391-505
1504-0361-505
1504-0301-505
1504-0251-505
1504-0201-505
1504-0181-505
1504-0151-505
1506-0301-550
1506-0251-550
1506-0201-550
1506-0181-550
1506-0151-550
1506-0121-550
1506-0101-550
1506-0121-550
1506-0101-550
1506-0820-550
1506-0750-550
1506-0560-550
1506-0470-550
1506-0101-550
1506-0820-550
1506-0560-530
1506-0470-550
1506-0360-550
1502-0103-003
1506-0221 -550
1506-0151-550
1506-0101-550
1506-0820-550
SECTION 8
a ED
Item No.
Description
Part No.
——————— Ed
C228
C229
C230
C231
C232
C233
C235
C236
C237
C238
C239
C240
C241
C242
C243
C244
C246
C247
*C248
*C249
*C250
A C PASI
“E252
*C253
CAPACITORS
470pf, 5%, 50V MICA (29-35 MHz)
360pf, 5%, 50V MICA (35-50 MHz)
150pf, 5%, 50V MICA (29-35 MHz)
100pf, 5%, 50V MICA (35-41 MHz)
82pf, 5%, 50V MICA (41-44 MHz)
75pf, 5%, 50V MICA (44-50 MHz)
.01, +80 -20%, 16V (Disc.)
360pf, 5%, 50V MICA (29-32 MHz)
300pf, 5%, 50V MICA (32-35 MHz)
270pf, 5%, 50V MICA (35-38 MHz)
250pf, 5%, 50V MICA (38-41 MHz)
220pf, 5%, 50V MICA (41-44 MHz)
180pf, 5%, 50V MICA (44-50 MHz)
1000pf, 5%, 50V MICA (29-41 MHz)
A70pf, 5%, 50V MICA (41-50 MHz)
.005mf, +80 -20%, 500V Z5U (Disc.)
.O1mf, +80 -20%, 16V (Disc.)
300pf, 5%, 50V MICA (29-32 MHz)
220pf, 5%, 50V MICA (32-38 MHz)
200pf, 5%, 50V MICA (38-41 MHz)
150pf, 5%, 50V MICA (41-44 MHz )
120pf, 5%, 50V MICA (44-50 MHz)
680pf, 5%, 50V MICA (29-32 MHz)
560pf, 5%, 50V MICA (32-38 MHz)
390pf, 5%, 50V MICA (38-44 MHz)
220pf, 5%, 50V MICA (44-50 MHz)
1000pf, 5%, 50v (Mica)
.Oimf, +80 -20%, 16V (Disc.)
390pf, 5%, 50V MICA (29-32 MHz)
360pf, 5%, 50V MICA (32-38 MHz)
270pf, 5%, 50V MICA (38-44 MHz)
180pf, 5%, 50V MICA (44-50 MHz)
mf, 20%, 12V (Disc.)
27pf, 10%, 500V, NPO (Disc.)
5pf, 10%, 500V NPO (Disc.)
mf, 20%, 12V (Disc.)
150pf, 5%, 50V (Mica)
Same as C243
2-18pf, Trimmer
39pf, 50v, 5% 00-580
Same as C246
Same as C247
Same as C246
Same as C247
Same as C246
Same as C247
C254 4-60pf MICA Trimmer (29-38 MHz)
C254 4-40pf, MICA Trimmer (38-50 MHz)
C255
C269
C270
C271
BTL-301
47pf, 5%, 500V (Mica)
300pf, 5%, 500v MICA (29-38 MHz)
270pf, 5%, 500v MICA (38-41 MHz)
1000pf, 5% 500v MICA (41-44MHz)
180pf, 5%, 500v MICA (44-47 MHz)
150pf, 5%. 500v MICA (47-50 MHz)
1000p7, 5%, 500v (Mica)
390pf, 5%, 50v MICA (47-50 MHz)
560pf, 5%, 50v MICA (29-47 MHz)
& BTL-304
1506-0471-550
1506-0361-550
1506-0151-550
1506-0101-550
1506-0820-550
1506-0750-550
1502-0130-003
1506-0361-550
1506-0301-550
1506-0271-550
1506-0251-550
1506-0221-550
1506-0181-550
1507-0102-004
1506-0471-550
1503-0502-002
1502-0103-003
1506-0301 -550
1506-0221-550
1506-0201-550
1506-0151-550
1506-0121-550
1506-0681-550
1506-0561-550
1506-0391-550
1506-0221-550
1507-0102-004
1502-0103-003
1506-0391-550
1506-036 1-550
1506:0271-550
1506-0181-550
1502-0104-005
1500-0270-605
1500-0050-905
1502-0104-005
1506-0151-550
1517-0000-001
1500-0390-550
1517-0000-005
1517-0000-009
1504-0470-505
1504-0301 -505
1504-0271-505
1504-0102-505
1504-0181-505
1504-0151-505
1504-0102-505
1506-0391 -550
1506-0561-550
Item No.
Description
Part No.
C272
C273
C274
C275
C276
C277
C278
C279
C280
C281
C282
C283
C284
C285
L201
L202
L203
L204
L206
L208
L209
L210
L211
E22
7201
T202
T203
7204
T205
T206
Q201
Q202
Q203
Q204
Q205
Q206
Q207
Q208
Q209
210
211
0212
0213
NOTE:
1C201
.0047mf, 10%, 100V (Mylar Film)
.01 uf, +80-20%, 50V, YM (Disc.)
.01 uf, +80-20%, 50V,YM (Disc.)
.01 uf, +80-20%, 50V, YM (Disc.)
.01 uf, +80-20%, 50V, YM (Disc.)
200pf, 5%, 50v MICA (29-35 MHz)
100pf, 5%, 50v MICA (35-50 MHz)
O1vf +80 -20% 50v YM (Disc)
.O1vf +80 -20% 50v YM (Disc)
O1vf +80 -20% 50v YM (Disc)
10vf 20% 25v Tant
150vf 20% 50v 25F
10vf 20% 25v Tant
O1vf +80 -20% 50v YM (Disc)
10vf 20% 25v Tant
*Used on BTL-304 ONLY
COILS
Coil Final Output (29-35 MHz)
Coil Final Output (35-41 MHz)
Coil Final Output (41-50 MHz)
Coil, Antenna Output (29-41 MHz)
Coil, Antenna Output (41-50 MHz)
Coil, RF Choke
Choke Bead Coil
Coil, Modulator (29-32 MHz)
Coil, Modulator (32-41 MHz)
Coil, Modulator (41-50 MHz)
Ferrite Bead
Same as L208
Same as L208
Same as L208
Same as L208
Transformer, SWR Bridge
Transformer, Driver (Violet)
Transformer (Blue)
Transformer (Green)
Transformer (Yellow)
Transformer (Orange)
TRANSISTORS
NUNnct. BET)
Silicon NPN
Same as Q202
Silicon, RF Power NPN
Silicon, RF Power NPN
Silicon NPN
Silicon NPN (BT)
Silicon NPN
Silicon NPN (BT)
Silicon NPN
Silicon NPN (BT)
Same as 0211
Silicon PNP
BT=Blue Top
INTEGRATED CIRCUITS
IC, Divider
Shield, |.C.
1508-0472-610
1503-0103-007
1503-0103-007
1503-0103-007
1503-0103-007
1506-0201 -550
1506-0101 -550
1503-0103-007
1503-0103-007
1503-0103-007
1515-0100-005
1513-0151-002
1515-0100-005
1503-0103-007
1515-0100-005
1801-3240-400
1801-3208-700
1801-3219-600
1801-3208-600
1801-1274-201
1803-3189-800
1803-1245-900
1800-3249-000
1800-3189-200
1800-3208-300
2502-0000-001
1800-3190-100
1800-3189-701
1800-3189-601
1800-3189-501
1800-3189-401
1800-3189-301
481 1-0000-030
4801-0000-010
4804-3169-503
4804-3169-604
4804-0000-015
4801-0000-003
4801 -0000-010
4801-0000-003
4801-0000-010
4801-0000-003
4802-0000-003
3130-3157-607
2508-1 265-900
SECTION 8
BTL-301 & BTL-304
TRANSMITTER BOARD SO0I—183
TOGWAS +
KINO vO€-118 NIQG3SN S3ILVOIONI TOGWAS *€
LIO€-148 GNV 10€-118 NI G3SN S3LVOIGNI
8-3 TRANSMITTER BOARD PARTS PLACEMENT DIAGRAM
SECTION 8
TRANSMITTER BOARD — 5OI-183
9,
fas
2 oe
28!) Ss & J
R2067°
INDICATES USED IN BTL-30I AND BTL-30IT ONLY
INDICATES USED IN BTL-304 ONLY
% SYMBOL
+ SYMBOL
5. SECTION 8
RECEIVER BOARD 500-943
Qepe-00e
+ SYMBOL INDICATES USED IN BTL-30I AND BTL-3OIT
% SYMBOL INDICATES USED IN BTL-304 ONLY
8-5 RECEIVER BOARD PARTS PLACEMENT DIAGRAM
BTL-301 & BTL-304 -6-
SECTION 8
RECEIVER BOARD 500-943
+ SYMBOL INDICATES USED IN BTL-30I AND BTL-30IT
% SYMBOL INDICATES USED IN BTL-304 ONLY
8-6 RECEIVER BOARD PARTS OVERLAY DIAGRAM
7. SECTION 8
+
7s,
Alas
Hy -
ides RT
yeaa te
'
iia
ag ~*
_
rae ey,
mS
oe Fi
BTL-300 SERIES
Wy
| RECEIVER
i } FREQUENCY |/CIOI |ClO2 |ClO3 |ClO4 [ews ClO6 |CI5) |cIs2
aioe
|
| | 30-35MHZ)| 33 300 | 1.2 27 12 22 27 | 18
it alk
—— ea 35-44MHZ|) 22 | 220 | 1.0 is 62
TRANSMITTER
FREQUENCY |! C238 |¢235 | C233 | c230|c229 |c227 |c226 |c225 22s) c22 C22) e220 [cats 269]L 206 |L 202 |c2i7 |c254|/c277|c271 Reis |Reze L201
1
it
| RIS! TT AE
¥i03 302-] 302. E j302-
IN 27k ae 29-32MHZ || 390 | 680 | 300 | 1000] 360 | 150 | 470 | 220| 100 | 120 | 300 380 | 470 300] 480 | oae | 4-60)4-60|200 |560 | 10 |.470 [04
32-a5muz || 360 | 560 | 220 | 1000] 300 | 150 | 470 | 220| e2 | 100 | 250 | 360| 390 | 300| 325 | 22% |4-60|4-60|200 |s60 | 10 | 680 |4n5.
RIs2 yio4 B92 | 086 404
27K 201- [302-
——¢ {{]+ 35-Bennz || 360 | 560 | 220 | 1000] 270 | 100 | 360 | 150 2 | 82 300 300] 255 | ose | 4-50! oS 560 | 10
30l- | 302-|
ecsiliecidlieedite 38—a1MHz || 270 | 320 | 200] 1000] 250] 100 | 360| 150] 56 | 75 | 180| 250] 270 | 270 | ago | oa6 | 4-40| 4-40 100 | 560 | 10
41-44 MHZ zr | 0 150] 470| 220 e2 | 360| 100] 47 | 86 | 150 |200 | 220 | 1000] 39% | 192" 14-40|/4-40]100 | 860 | 10
44-47MHZ|| 180 | 220] 120 | 470] 120 | 75 | 360] 82 | 47 [2s 20 | 180 | 180 | 180 | 383°] 132)14~-40|4-40| 100 | 560 | 10
T
083 | 742-
}47-somtz || 180 | 220] 120 | 470 | 180 | 75 | 360| 82 | 36 @ | 100 150} 150 | 180 | 302) 102 4-40|4-40[ 100 | 390 | 15
a3
=
BTL-304 MODELS
it | E
Gi NOTES:
EE] 1 P25 Pl27 |. ALL CAPACITOR VALUES NOT SPECIFIED ARE PICO-FARAD.
! s pen ALL RESISTOR VALUES NOT SPECIFIED ARE OHMS, 1/4 WATT.
| 2. & NOTED VALUES ARE FACTORY SELECTED. NOMINAL VALUES SHOWN.
| 3. SEE TABLES FOR VALUES OF COMPONENTS NOTED &
€ K 4, 1208,L209,L210,L2I|,AND L212 ARE FERRITE BEADS PLACED OVER
1 COMPONENT LEADS,
| | | | sat {P24 5. ALL VOLTAGES (FIGURES IN RED) ARE NOMINAL VALUES AS MEASURED
| HIGH IMPEDANCE = | WITH A VTVM. SUPPLY VOLTAGE 13,8 VDC AT INPUT TO POWER CABLE
iz 1 13.8 Rx
| MICROPHONE __ | | RY-1 SUPPLIED WITH UNIT.
=x2 | | =H a, LETTER FOLLOWING A VOLTAGE INDICATES THE FOLLOWING CONDITIONS
| | | U= UNSQUELCHED
| | ee ‘S SQUELCHED—THRESHOLD
| | heel T= SQUELCHED —TIGHT
| Wye fo 0 Hoot! z b, VOLTAGES INDICATED IN TRANSMITTER SECTION ARE MEASURED WITH THE
| | j iBTL3o1| fe0a! gl TRANSMITTER IN OPERATION AND CONNECTED TO A PROPER LOAD.
| 18304 | jBTE| 6. PART NUMBERS INDICATE LOCATION
Say | MODE 470 130) T 0-99 CHASSIS MOUNTED
(MODELS) Belty
USED IN MODELS MFGD. PRIOR TO | | aes aan 100-189 RECEIVER BOARD
DEC. 1, (975. i | (77x 200-299 TRANSMITTER BOARD
| Lp302 300-399 LED DISPLAY BOARD
||!
i]! it
i|! 7
ees = |
f a \
| HANG UP BUTTON | mi
——
ek Ses ] 1 | |
| 5 > | Wy
| | i
| | i
|
| Ht = E: s ee
| | P210 P203 7]
| | : 'ar-s01 a soir | SWIA sw2a SW3A SWw4A |
| | 2 fe | MODELS | = pee aed fia se ee |
| | 209 | ° |
USED IN MODELS MFGD. AFTER DEC.I,1975 | =
mAs pal | 204 P204 205 206 p207 |
Syeo1 3 y2o2 = yeo3 y2o4 |
yo |
cae c2asl C250 252
2K 218 218 218 |
P2is
47 49 e251 253
a iT Te Tt Be T ie |
| BTL-304 MODEL
C246 C247 o !
8-7 SCHEMATIC WITH VOLTAGES
SECTION 8
BTL-301 -304
-
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ay
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BTL- 300 SERIES
RIO3
war R109
680
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CHS.
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Ri
22K
RECEIVER
cue
PHO ° T Ott — jc102 |CI0s ens [oes cs Jessi corse
=!
= 30-36Mez|| 35
3-44
44-S0MAZ
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of Moves |
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1 wuios |
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2 [=|22 [ese |t xe [2x2] eer [c= lear feen [res [rezsfiz0
-SSG0UES2>5 10 |e Boe
360 | 390 | 300| 305 | 32% | 4-60} 4-60| 200 |s60
738
aio2
i
+] looout
250| 270 | 270
jpn
|BTL-301
150 |200 220 | 1000| 30%
| 13.8 voc
Pee | 1k 3
'44-a7unz|| 180 | 220
47-20mHz |] 180 | 220
BTL-304 MODELS
GND NOTES:
1 ALL CAPACITOR VALUES NOT SPECIFIED ARE PICO-FARAD.
ALL RESISTOR VALUES WOT SPECIFIED ARE OHMS, 1/4 WATT.
2. Q NOTED VALUES ARE FACTORY SELECTED. NOMINAL VALUES SHOWN
3 SEE TABLES FOR VALUES OF COMPONENTS NOTED &
4 1208, 209, 210,L2I1.AND L2I2 ARE FERRITE SEADS PLACED OVER
COMPONENT LEADS.
5. ALL VOLTAGES (FIGURES IN RED) ARE NOMINAL VALUES AS MEASURED
WITH A VTVM, SUPPLY VOLTAGE* 13.6 VDC AT INPUT TO POWER CABLE
SUPPLIED WITH UNIT.
@ LETTER FOLLOWING A VOLTAGE INDICATES THE FOLLOWING CONDITIONS
U= UNSQUELCHED
S¢ SQUELCHED—THRESHOLD
T* SQUELDED—TIGHT
b. VOLTAGES INDICATED IN TRANSMITTER SECTION ARE MEASURED WITH THE
TRANSMITTER IN OPERATION AND CONNECTED TOA PROPER LOAD.
6. PART NUMBERS INDICATE LOCATION
o-s3
Pa
USED IN MODELS MFGD. PRIOR TO
Ss Ss ee =
300-398 LED DISPLAY BOARD
R202
Took 3 “ap
os
cUsee IN MODELS MFGD. AFTER DEC1,1975
-
. 8-7 SCHEMATIC WITH VOLTAGES
BTL-301 -304 8- SECTION 8
a SECTION 9 SERVICE MANUAL ADDENDUM
The following modifications now exist in the BTL-301 and BTL-304 VHF FM
Transceivers. The revisions pertain to the Relay Board 501-265. Effective
December, 1975.
CONTENTS
9-1 Component List plus cross reference to previously used schematic
numbers
Relay Board Parts Placement Diagram
ee
9-3 Relay Board Parts Overlay Diagram
9—1 COMPONENT LIST PLUS CROSS REFERENCE
Item No. Description Part No. Cross Reference Item No.
RY-701 Relay 302-519 4500 -325 1-900 RY1
C701 CAP CD 15 PF, 10% NPO 50V_——:1500-0150-650 al
C702 CAP Ee250)uf, 16V 850,Type U 1513-0251 -002 C148
BTL SERIES -1-
SECTION 9
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9—2 RELAY BOARD PARTS PLACEMENT DIAGRAM
BTL SERIES #2 SECTION 9
diuylS Wust 30010 ALIYV 10d
¢ ON) ASY3ASY
G9¢-IOSG GHYVOd AV 1S5u
XL
LNV
9—3 RELAY BOARD BOTTOM VIEW
HOLIMS
4A0/NO
SECTION 9
BTL SERIES
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@B SECTION 10 C.T.C.S.S. ACCESSORY ADDENDUM
This accessory provides a continuous tone coded sub-audible squelch function
for the BTL-301 and BTL -304
CONTENTS
10-1 Circuit Description
10-2 Adjustment Procedure
10-3 Specifications
10-4 Voltage Chart
10-5 . Schematic
10-6 Parts Placement Diagram
10-7 Parts Overlay
10-8 Component List
10—1 CIRCUIT DESCRIPTION
Detected signal from IC 102 is fed to IC801 and IC802; IC801 is a high-pass filter
which removes tone frequencies from the audio. IC802 is a low-pass filter which
selects the signalling frequency and removes audio, feeding the signalling frequency
to IC803 and 1C804 which are the filter for the code frequency. 1C803 is the frequency
determining network and IC804 is an amplifier. IC805 is a detector which, when the
ao proper frequency is present at the filter output, switches Q107 off, unsquelching the
EeCeCIVers
The Microphone Hang-up Button is connected to Pin 6 of IC804. When the Hang-
up Button is grounded, the circuit operates as above. When the Hang-up Button is un-
grounded, the decoder is disabled leaving the receiver under noise -squelch control.
Also, IC803 and IC 804 go into oscillation at the tone code frequency and provide encode
tone through R803; the tone deviation control to the transmitter.
10—2 ADJUSTMENT PROCEDURE |:
Connect the unit to a Dummy Load
Couple an F.M. Modulation Meter's RF pick-up to the transmitter
With the Microphone Hang -up Button ungrounded, key the transmitter
Adjust the Tone Deviation Control, R803, for +0.5 to +1.0 KHz tone deviation
Apply 0.5 to 1.0 volts RMS at 1 KHz audio to the microphone input
Adjust Deviation Control, R216, for +5 KHz composite deviation
moand oO ®&
10—3 SPECIFICATIONS
IVE NUeHCY RanvGe ea. scissile te « EIA Standard Frequencies from 67.0 to 250.3 Hz
Ree. Sensitivity .'e. eeeeeeeeeee@ eeeoooov0o0e2@e@cdcecoeve@eeeeopeeeovoeeeee7eoeo2ecg080280802900 0.15 pv
Response Time.... @eeeoe#ee @eeeeeeoo0@e oer e@0000@290808088080802808080888080 8 eeeoee 325 ms (max.)
PE ACOGCHICVIAtON Gs is-s-61cle0s. «6 tuneae ste satetciatc.e eee tere ee Ulustable, .0 tO 2 lkKHz
BTL SERIES sds SECTION 10
10—4 VOLTAGE CHART
IC801
1C802
(2)
1C803
(1) @)
IC804
(1) 2)
IC805
(1)
(2)
NOTE:
BTL SERIES
13.8
10
a2
NC
NC
NC
NC
=
NC
By:
2
53
5.2
S22
All voltages are nominal and were measured with a VTVM, 13.8 VDC supply. Microphone off-hook.
1) Denotes readings with microphone in grounded hang-up clip.
2) Denotes readings with conditions as in 1) and R.F. signal with code tone applied.
SECTION 10
JILVW3SHOS
OIGVY JISVE OL SLNIOd NOILOS3NNOS 3Y¥vV S3X08 G3u31LLIT¢E
JILVWAHOS O1OVY JISVE YOS4 b1Z-O002 ONIMVYG OL Y349NZ
LIVM >/1 SYV SSIMYSHLO G3ISIODAdS LON SYOLSISSY 11V
SWHO 3YV 3SIMY3HLO O31dID3dS LON SYOLSISSY 11V
QVYVS OOld JUV ASIMYSHLO G3IsID3dS LON SYOLIOVdVO W1V |
x vy :S3LON
10—6 SCHEMATIC
i
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062-10S — GHVOG INOL DIA / INF
SECTION 10
BTL SERIES
TONE OPTION BOARD 50OI-290
BTL SERIES
10—6 TONE OPTION BOARD PARTS PLACEMENT
AA
SECTION 10
uy
O62
S 4
lOS QGYVOd NOILdO 3NOL
10—7 TONE OPTION BOARD BOTTOM VIEW
SECTION 10
BTL SERIES
10—8 COMPONENT LIST
en EEUU EEE EE
Item No. Description Part No.
RESISTORS
R801 130K, “W, 5%
R802 91K, “ZW. 5%
R803 10K Variable ‘ 4751-0103-002
R804 15K, “ZW, 10%
R805 22K, “ZW, 10%
CAPACITORS
C801 15mf, 16V, Ill Tupe U 1513-0150-002
C802 15mf, 10V, 20%, T360 (Tant) 1515-0150-002
C803 .2mf, 12V, +80%-20%, BC-12 1502-0204-006
C804 470pf, 50V, 20%, 25F 1523-0471-002
C805 15mf, 10V, 20% T360 (Tant) 1515-0150-002
C806 Amf, 12V, 20%, BC-12 1502-0104-005
INTEGRATED CIRCUITS
1C801 IC Hybrid 501-148-5 3133-5114-805
1C802 IC Hybrid 501-148-1 3133-5114-801
1C803 IC Hybrid 501-148-4 3133-51 14-804
1C804 IC Hybrid 501-148-2 3133-51 14-802
1C805 IC Hybrid 501-148-3 3133-5114-803
BTL SERIES
SECTION 10
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