Document text
Instruction
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STANDARD WARRANTY
R. Le DRAKE COMPANY warrants each new radio product manufactured by.
it to be free from defective material and workmanship and agrees to
remedy any such defect or to furnish a new part in exchange for any
part of any unit of its manufacture which under normal installation,
use, and service discloses such defect, provided the unit is de-
livered by the owner to us or to our authorized radio dealer or
wholesaler from whom purchased, intact, for our examination, with all
transportation charges prepaid to our factory, within ninety days
from the date of sale to original purchaser and provided that such
examination discloses in our judgement that it is thus defective.
‘Should a malfunction be suspected, write in detail to our Service
Department for suggestions concerning the operation, repair or return
of your unit if it should prove necessary.
This warranty does not extend to any of our radio products which have
been subjected to misuse, neglect, accident, incorrect wiring not our
own, improper installation, or to use in violation of instructions
furnished by us, nor extend to units which have been repaired or
altered outside our factory, nor in cases where the serial number
thereof has been removed, defaced or changed, nor to units used with
accessories not manufactured or recommended by us.
Any part of a unit approved for remedy or exchange hereunder will be
remedied or exchanged by the authorized radio dealer or wholesaler
without charge to the owner.
This warranty is in lieu of all other warranties expressed or implied
and no representative or person is authorized to assume for us any |
other liability in connection with the sale of our radio products.
|
The R. Le DRAKE COMPANY reserves the right to make any improvements
to its products which it may deem desirable without obligating itself
to install such improvements in its previously manufactured products.
Ro Le DRAKE COMPANY MIAMISBURG, OHIO 45342
TABLE ONS CON GeEa ers
PAGE
i. Coie IME DEeCRIPTION .....0.. oo al
al FEATURES 1
DD SPECIFICATIONS 1
De Diem LO NY oro. ope. flee >, Miah 2/40): 3
m1 UNPACKING | 3
2 2 LOCATION 3
eS ANTENNA REQUIREMENTS 3
2.4 POWER REQUIREMENTS 3
2.5 SPEAKER AND HEADPHONE REQUIREMENTS 3)
2.6 MICROPHONE REQUIREMENTS 3. |
a. EOP er Os mee PMUG MEO NS... -.. gov cle cs ce eck ewe 4
cogil FRONT PANEL CONTROLS 4
geo INTERNAL CONTROLS 4
AN eee ON ee ee ee oe es ee es 6
Z| OPERATION WITH INTERNAL NICKLE-CADMIUM BATTERIES 6
NID OPERATION WITH DRY CELL BATTERIES 6
Ae 3 OPERATION WITH ALKALINE BATTERIES 7
4.4 AMCeROPERATION 7
4.5 AUTO GENERATOR/ALTERNATOR NOISE 7
a6 OPERATION WITH AN EXTERNAL D.C. SOURCE 7
5. Pee McG eeN De REG EIVE “CRYSTALS (f.-.4". 8
weal INSTALLATION 8
Soe) CRYSTAL ORDERING INFORMATION 8/9
6 Pre eer eect TO OUUNG ...280e 6 oe Pie be a 10
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9 eee mo RN (OF -T.R-22 . 6. 6k ee wes Fold Out
R.L.DRAKE COMPANY ,540 Richard Street, Miamisburg,Ohio 45342
See outer oor eee Dept. Phone 513-866-3211] **** * tex eRe
GEMERAL SDES CRIP DROW
FEATURES
The TR-22 is a 2 meter VHF-FM transceiver with a capacity for 6 chan-
nels and will operate from an external 12 V DC source or from its inter-
nal rechargeable nickle cadmium batteries. A 120 V AC 50-60 Hz .
battery charger is built into the TR-22.
Se ChE CAGE VOlNe
GENERAL
Frequency Coverage: 144 - 148 MHz
Number of Channels: 6 channels, 3 supplied.
Channel 1 Channel 2 Channel 3
Receive: 146.94 MHz 146.94 MHz 146.76 MHz
Transmit: 146.34 MHz 146.94 MHz 146.34 MHz
Transmitter Control: Push-to-talk
Power Drain: DEGec
Receive: 45 mA squelched
Transmit: 450 mA
Power Source: 13 Dee 2075
120 VAC 50-60 Hz (for recharging
nickle cadmium batteries only).
Dimensions: 5-3/8" x 2-5/16" x 7-1/8"
Weight: 3-3/4 pounds
Accessories Supplied: Dynamic microphone,
Over-the-Shoulder carrying case,
120\V AG and I2 V D@spewer cord,
Speaker plug, and
Ten (10) nickle cadmium batteries.
Page l
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1
a CAE
ae
RECEIVER
Receiver Circuit:
lst i requency:
ands le Frequency:
Antenna Input Impedance:
Sensitivity:
Selectivity:
Modulation Acceptance:
Audio Output:
TRANSMITTER
RE, Output Power:
Frequency Deviation:
Completely transistorized crystal
controlled double conversion super-
heterodyne.
L027 =IMiz
455 kHz
50 Ohms
On5 Microvolt or less for 20 dB
quieting.
20 Kitz -at — 6.0B
ie, kHz
Die7. Watt at 10% or less distortion.
1 Watt (conservative)
Adjustable to + 10 kHz maximum
PAClony set lo ofkiZ
Page 2
"he
The.
ae
INSTALLATION
UNPACKING :
Carefully remove the TR-22 Transceiver from its carton and examine it
closely for signs of shipping damage. Should any be apparent, notify
the delivering carrier immediately, stating the full extent of the damage.
Fill out and mail the enclosed registration card so that your warranty
will be effective.
Save the packing material. You may need it later for reshipment or
storage. Inspect the packing material closely before putting it away to
be sure you have not overlooked the accessories packed with the unit.
LOCATION
In general, the location of the TR-22 is not cricical. However,
extremely hot locations, such as near radiators or heating units, or on
top of other radio equipment should be avoided.
ANTENNA REQUIREMENTS
The TR-22 has a self contained antenna. It should be extended to its
full length for proper operation. An external antenna connector is
provided on the rear of the TR-22. External antennas should be
resonant at the operating frequency and present an impedance of 50
ohms. The self contained antenna should be retracted whenever
external antennas are in use.
POWER _ REQUIREMENTS
The TR-22 is supplied with rechargeable nickle cadmium batteries for
portable operation. It is also possible to operate the TR-22 from eight
size AA carbon zinc dry cells. A DC power plug is provided for
operating on an external 12 V DC source. This plug plugs into the
connector on the rear of the TR-22 just below the external antenna
connector. When the DC power plug is in use, the internal batteries
are disconnected. The 120 V AC power cord and rear connector are
provided for charging the nickle cadmium batteries. Operation from
the 120V AC charger is not recommended.
SPEAKER AND HEADPHONE REQUIREMENTS
The TR-22 has a built-in speaker. An external 8 ohm headphone or
speaker may be plugged in the miniature phone jack located on the
front panel just above the microphone jack. Plugging an external
speaker or headphone into this jack turns off the built-in speaker.
MICROPHONE REQUIREMENTS
A 500 ohm dynamic microphone with a push-to-talk switch is supplied
with the TR-22.
Page 3
Biel.
3.2
Bek 92
Sane.
COIN dane lee NOTIONS
FRONT PANEL CONTROLS
ON-OFF SWITCH AND VOLUME CONTROL
The ON-OFF switch and VOLUME control are combined in the lower
left control. Clockwise rotation turns the TR-22 on and increases
audio gain.
SQUELCH AND BATTERY CHECK CONTROL
The SQUELCH and BATTERY CHECK control is located directly
beneath the meter. Full counterclockwise rotation will operate the
battery check switch and the battery voltage will be indicated on the
meter. Clockwise rotation of this control increases the signal level
required to defeat the squelch circuit and allow reception.
CHANNEL SELECTOR
The large knob in the approximate center of the TR-22 selects one of
six possible transmit and receive crystal pairs.
INTERNAL CONTROLS
DEVIATION CONTROL
Frequency deviation is factory set to +5 kHz. Greater deviation than
this can be obtained by adjusting VR21 on the transmitter circuit
board. Remove the case by releasing the two captive snap buttons on
the case rear at both corners. Remove the plastic cover by first re-
moving the two flat berylium copper springs on each side of the
chassis. With the TR-22 upside down and front panel facing you,
VR21 is located 2 inches behind the squelch control and the designa-
tion "VR21" is printed on the circuit board. Frequency deviation
increases when the slider of VR21 is moved towards the rear of the
TR-22. Use a screwdriver with an insulated shaft and handle for this
adjustment. Replace the plastic cover and flat springs.
TRANSMITTER FREQUENCY ADJUSTMENT
With the front panel facing you and the TR-22 upside down, the trans-
mitter crystals correspond to the channel numbers and are numbered
from the extreme left to the right, 1 through 6. The bank of trimmer
capacitors in back of the transmit crystal sockets allow transmit fre-
quency adjustment left to right, channels 1 through 6.
RECEIVER FREQUENCY ADJUSTMENT
There are no provisions for receiver frequency adjustment. Receiver
crystals must necessarily have a low frequency tolerance of .001%.
Page 4
3
oF
ue
oa
S=METER SENSITIVITY ADIUSIMEND
The S-meter response sensitivity is determined by the trim pot VR2 on
the receiver circuit board. With the front panel facing you and the
TR-22 upright, VR2 is located at the right, close to the front panel.
Apply a 100 microvolt signal to the TR-22 antenna on 146.76 MHz and
adjust VR2 for full scale meter deflection. Use a screwdriver with an
insulated shaft and handle for this adjustment.
RELATIVE RF OUTPUT METER ADJUSTMENT
The RF Output Meter response sensitivity is determined by the trim pot
VR23 on the transmitter circuit board. With the front panel facing you
and the TR-22 upside down, VR23 is located immediately behind the
left two transmitter trimmer capacitors. While transmitting into a 50
ohm dummy load, adjust V23 for a reading of 8 on the RF output meter.
Use a screwdriver with an insulated shaft and handle for this adjust-
ment. In normal use, if the RF output goes into the red region, check
for low batteries.
BATTERY CHECK METER ADJUSTMENT
The Battery Check meter response sensitivity is determined by the trim
pot VR22 on the transmitter circuit board. With the front panel facing
you and the TR-22 upside down, VR22 is located at the right rear of the
circuit board. With 10.0 volts applied to the DC power cord, turn the
TR-22 on and rotate the squelch control fully counterclockwise into
the "B. CH" (Battery Check) position and set VR22 so that the battery
check meter needle covers the blank space between the red and black
sectors on the meter face. Use a screwdriver with an insulated shaft
and handle for this adjustment.
Page 5
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oe
OPERA LO N
OPERATION WITH INTERNAL NICKLE-CADMIUM BATTERIES
The TR-22 is shipped with ten ni-cad batteries. These batteries
should be inserted into one 4 cell and one 6 cell holder supplied, and
installed in the TR-22. The batteries should be charged before using
the TR-22. Charging is performed by plugging the AC cord supplied
into the rear of the TR-22 and into a 120 VAC outlet. The batteries
should be charged whenever the battery check meter needle reaches
the right edge of the red scale. Battery condition may be checked by
turning the TR-22 on and rotating the squelch control fully counter-
clockwise into the "B. CH" (Battery Check) position. Battery condition
should be checked each time before using the TR-22 and operation
suspended if the battery condition is not within the black scale. Do
not charge the batteries longer than 16 hours. Do not completely
discharge the batteries (below 5 on the meter scale) because if dis-
charged too far,the weakest cell in the string may reverse polarity and
become permanently damaged. The TR-22 must be turned off in order
for the batteries to take a charge. Transmitting while charging will
result in hum on the transmitted signal and the batteries will be further
discharged because the charger can supply only 45 mA while 450 mA
is required for transmitting. The receiver draws 45 mA squelched.
Therefore no battery condition improvement can be expected while
simultaneously charging and receiving. Charging while receiving is
not recommended.
The TR-22 is operated by turning the ON-OFF switch ON, extending
the built-in antenna and rotating the SQUELCH control clockwise until
the receiver is muted. A channel with no stations transmitting must
be selected in order to set the squelch control. An external antenna
may be plugged into the connector on the rear of the TR-22. When
using an external antenna, the built-in antenna must be retracted.
Do not transmit on the TR-22 when no external antenna is connected
and with the built-in antenna retracted. The TR-22 transmits when
the button on the microphone supplied is depressed.
OPERATION WITH DRY CELL BATTERIES
The TR-22 is supplied with an extra 4 cell battery holder so that it
may be operated from penlite dry cells. Remove all of the Ni-Cad
batteries. Fill both four cell battery holders with dry cells and install
the 8 dry cell batteries in the TR-22. Do not use more than 8 dry
cells. Do not charge the dry cells with the TR-22 charger. Do not
leave discharged dry cells in the TR-22. Do not store the TR-22 for
long periods with dry cells installed and use only leak proof dry cells
in the TR=22.
The TR-22 may be operated as described in the second paragraph of 4.1.
Page 6
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OPERATION WITH ALKALINE BATTERIES
Alkaline batteries may be used in the TR-22. A new set of alkaline
batteries may last up to four times as long as one charge on Ni-Cad
batteries. Alkaline batteries are very useful for operating the TR-22
when away from a source of power to recharge the Ni-Cad batteries.
Only 8 alkaline batteries are required and these should be installed in
the two 4 cell battery holders supplied with the TR-22.
The alkaline batteries should not be recharged unless the battery
manufacturer states that they are rechargeable.
The TR-22 may be operated as described in the second paragraph of 4.1.
BO. OPERATION
(A.C. operation of the TR-22 may be accomplished only by use ofa
12.5 V DC power supply powered from 120 VAC. This supply should
have good voltage regulation and be capable of delivering 500 mA.
Connection to the TR-22 should be made at the D.C. cord supplied.
AUTO GENERATOR/ALTERNATOR NOISE
Some automobile electrical systems are not sufficiently filtered and a
slight buzz in the TR-22 signal may be reported when operating mobile
from the auto battery. An external filter shown below will correct the
situation. The RF chokes and capacitors are available from the
R. L. Drake Company at $1.75 for each component.
a
ee $a aes Pre
Battery DG input
Capacitors - 1000 ufd @ 15 V or more,
Chokes - 1 mH or more @ 1/2 amp.
OPERATION WITH AN EXTERNAL D.C. SOURCE
The TR-22 may be operated from an external 13 volt + 20% source by
plugging the D.C. cable supplied into the D.C. connector on the rear
of the TR-22. The wire with the gray stripe is the positive lead. The
internal batteries may be charged from AC while the D.C. plug is
installed. The internal batteries cannot be charged from the external
D.C. source.
Page 7
oe
TRANSMIT AND RECEIVE CRYSTALS
INSTALLATION
INSTALLING TRANSMIT CRYSTALS
With the front panel facing you and the TR-22 upside down, transmitter
crystals correspond to the channel numbers and are numbered extreme
left to right, 1 through 6. Crystals should be adjusted on frequency
before operating. (See Oued. ie
INSTALLING RECEIVE CRYSTALS
With the front panel facing you and the TR-22 upside down, receiver
crystals correspond to the channel numbers and are numbered extreme
right to left, 1 through 6.
TRANSMIT CRYSTAL JUMPERS
One transmit crystal can be used on several channels by connecting a
jumper wire from the terminal lug in front of the transmit crystal to the
lug of the channel that is desired to be repeated. With the front panel
facing you and the TR-22 upside down, the terminal lugs correspond
to the channel numbers and are numbered extreme left to right,
1 through 6.
RECEIVE CRYSTAL JUMPERS
One receive crystal can be used on several channels by connecting
a jumper wire from the terminal lug in front of the receive crystal to
the lug of the channel that is desired to be repeated. With the front
panel facing you and the TR-22 upside down, the terminal lugs
correspond to the channel numbers and are numbered extreme right to
tet, a1 tthrougn 6.
CRYSTAL ORDERING INFORMATION
Accessory channel crystals may be ordered from the R. L. Drake
Company. To order, specify the desired receive and transmit frequency
and indicate that they are forthe TR-22. Due to critical TR-22
crystal requirements , we recommend ordering crystals only from the
R. L. Drake Company.
If you desire to order crystals from another source, the following
information should accompany your order:
Transmit Crystals
Fundamental mode parallel resonant with 42 pF load capacity in
HC-25/U plug-in holder, and + .003% frequency tolerance.
Divide transmit frequency by 12 to obtain crystal frequency.
Page 8
CRYSTAL ORDERING INFORMATION (continued)
Receive Crystals
Parallel resonant, 3rd overtone mode with 35 pF load capacity in
HC-25/U plug-in holder and + .001% frequency tolerance or less.
Crystal frequency = (Operating frequency in MHz - 10.7 MHz) |
3
Page 9
TROUBLE Si. O LNG
Careful consideration has been given in the design and testing of the
TR-22 to keep maintenance problems to a minimum.
If you experience difficulty, we recommend that you return the TR-22
to your Drake dealer or write direct to our Customer Service Depart-
ment and describe your problem in detail.
DiGm tO. ko TLURNS EQUIPMENT TO .THE FACTORY
Wie OuUTePRiORe-AUTHORIZATION “|!
The high component density and small circuit board size of the TR-22
necessitates extreme care and a high level of competency in the
repair of this unit. We highly recommend all repair work be performed
by our service department. Please note that our warranty
il VOUCH ie awiiNOonmized repair work is -performed
Onestne- ll R22.
Page 10
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Base or Gate
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TR-22 VOLTAGE CHART
Emitter or Source
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Cotlector or Drain
Refer to circuit diagram for IC voltages
Refer to circuit diagram for IC voltages
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Page ll
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32540 Stricker Drive
Warren MI 48093
eee WODIFICATION
momen POWER OUTPUT)
ne of the most popular 2 meter FM
ye eicer in use today is the TR-22
from the R.L. Drake Company. Much of its
popularity is due to the established reputa-
tion for quality of Drake products, but also
the versatility of the unit itself. It can be
used effectively as a mobile, a portable, and
even a base station.
I have used my simplex as far as ten
miles, but find that its very best dependabili-
ty comes working into the repeaters in the
Detroit area where I live. As a mobile, I can
operate it on the car battery, and with a 5/8
whip, I have no trouble reaching the DART
repeater on 04—64 or the GLRA on 16—76
from anywhere in the city or nearby
suburbs. But I have also found that with a
very simple modification, I could increase its
power enough so that it would also hit the
same two repeaters when I’m as far as 25 or
30 miles out.
BB EOCBEELDELE IE LLB AELELMO DES
LER ADMIRE SEEDER RSD Rl SSG jis
The transistor with the ring around it is the driver (Q28) that we are going to change. To gain access to
the foil side of the transmitter board, we turn the rig over and remove the receiver board.
FEBRUARY 1973
91
transmitter board is illustrated in the Owner’s manual with the foil side showing how actual
nections are made. Here a circle has been drawn around Q28 to show the three connections where
present transistor is removed and the new one su bstituted.
The finger points to the same place on the actual board in the TR-22.
EBRUARY 1973 93
Here an unmodified TR-22 is operated into a
dummy load with a Bird Wattmeter showing actual
output of 1.7W.
sub-audible tone encoder circuit to it be-
cause the two repeaters in the Detroit area
require a 100 cycle tone for access. In the
plastic bag at the upper right is the miniature
circuit board and there are four wires leading
from it to the left and down near the
speaker to connect to the reed. Part of it can
be seen above the ac connector at the
bottom of the picture. Those wires also
appear in the photo showing the fiberglass
insulating board under the receiver board.
The only wires seen in a regular set at that
point will be the two leading to the speaker.
Even though this is a simple modification
to accomplish, some precautions need to be
taken to keep from turning it into a very
complex project. Extreme care must be
taken in the handling and movement of the
boards to insure against breaking off any
wire connections, and there is one other
pitfall to be sure to avoid. Normal time to
94
temporarily remount the antenna after \\
fiberglass board is removed, or just \\
careful to not move the rig around so the\
that darned screw does not slide back. I hac
no problem with this in making the modifi-
cation to my unit, but in taking it apart
again to take the pictures for this article, it
did get away from me. In recovering it, the
terminal broke off and I had to replace the
miniature coax and terminal. It was an extra
task which could have been avoided by
merely keeping the screw that holds the
antenna from sliding back.
With all other conditions the same, the modified
transceiver output increases to 2.7W.
73 MAGAZINE
This photo and the next one show that a higher
input to an amplifier like the TPL 502B will yield a
higher output. Here the TR-22, as it comes from
Drake, will have an output of 42W, with the aid of
the TPL.
Removing the old transistor and soldering
in the new one are done in the same manner
as routine soldering jobs. Since the transis-
tors fit flush to the circuit boards, there is
no room for using clamps to heat sink the
connections while soldering. You should
have no trouble here providing the iron is
applied to each terminal only long enough to
make the connection.
The two coils to be peaked are TC-27 and
TC-28 and are plainly marked on the board.
Alternating back and forth between the two
as the Bird meter is watched for its highest
output reading will complete the job.
For our tests and photos, I used a regular
12V automotive battery for the power
source, and had the car engine running at
fast idle to insure maximum voltage and
current available. While it is best to show
examples like this in terms of maximums, it
should be remembered that the real benefits
to raising power output in small amounts is
in the lowest ranges, or when operating
portable on the self-contained nicads.
There are several Class C amplifiers avail-
able to use with the smaller rigs like the
TR-22. Drake offers their own AA-22 for
25W out, and the AA-10 for 10W. If you
make this modification, you wiil not be able
to use the new amp as it has a fixed input to
match the TR-22s as they come from the
FEBRUARY 1973
With the new driver transistor installed, the power
from the amplifier increases to about 49W.
factory. It should also be borne in mind that
if your rig is less than 90 days old and
therefore still under warranty, it would not
be wise to make this or any other modifica-
tion. No matter what you buy today, the
warranty will be void when any unauthori-
zed repairs or modifications are made to the
product.
Battery life of the nicads is shortened by
the increased output as it naturally takes
more power. While this is difficult to
measure, it has been estimated by my
use — and some others that I know who have
done theirs — to be approximately 25% less.
For anyone who would find this to be
confining to their operation, the original
nicads could be replaced with some 500 mil
nicads and this would increase the battery
life by about 10%.
If you own a TR-22, the decision to make
the modification should be made based on
your own particular type of operation. For
portable and mobile use barefooted, it al-
most doubles your effective range. If you
work into a variable input amplifier, your
increase will be in the vicinity of 16 to 20%.
My own experience has proven it to be
worthwhile, and in the six months since I
have done it, I have found no reason to wish
that I had not made the modification.
.. .W8FJA
95
Separate S and discriminator
(either one watt Or ten watt output) e Remote VFO
Plug®12 Volt Dc Or 110 Volt AC Operation ®@ Crystals supplied in 4 channels @ AC/DC
cable supply
: . It plugs directly into the
IC-21. This combination we are offering at a SPECIAL INTRODUCTORY PRICE. These two units can be
purchased at only -00. is i i i
: € lot price of $399.50 for the IC-21 and
1 VFO.
Rica
Send your order today to
the address below or see
the INOUE line at your
i : j ‘favorite dealer,
ADIRONDACK RADIO SUPPLY. INC.
185 West Main St. Amsterdam, New York 12010
INSTALLING NEW HEP-75 TRANSISTOR IN THE DRAKE TR-22
1. Extreme care must be taken in the handling and movement of the boards to
insure against breaking off any wire connections.
2. Remove self contained antenna. NOTE - Be careful not to lose the screw
connection for the antenna,
3. Remove two mounting screws under the antenna.
4. Remove two mounting screws under the wires on the lift side.
5. After removing the four screws, take off two more that hold the small
right angle bracket to the right side of the chassis frame.
6. Carefully lift the receiver board to the right and out.
7. NOTE - You will now see the white fiberglass insulating board and
speaker wires.
8. Temporarily remount the antenna wires after fiberglass board is removed.
9. Unsolder and remove old transistor and install the new one. Transistor
mounts flush to circuit board.
10. Reassemble unit.
11. Peak two coils TC-27 and TC-28, alternating back and forth between the
two as the Watt meter is watched for it's highest output reading.
Job Completed
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INSTRUCTIONS FOR THE TEMPO CT-252-A-2
INTRODUCTION
Tempo and CT offer the finest amateur RF amplifiers for VHF FM available on the market today. Years of
~ experience in solid state RF design have gone into the amplifiers to assure the highest degree of efficiency and
reliability. All components have been chosen because of their reliability and performance. The power transis-
tors have been selected from leading American manufacturers. Still with these quality components, this ampli-
fier is economically and competitively priced because of the advanced techniques employed in its design and
manufacture. With proper care, your amplifier will offer a lifetime of dependable service.
INSTALLATION INSTRUCTIONS
Before installing the amplifier, check it for visible damage. If there is damage, return the amplifier to your dealer
immediately. The solid state devices in the amplifier may be damaged if the unit is operated in a damaged condition.
Also please return the warranty card to Henry Radio within 10 days of purchase.
The amplifier comes complete with all of the necessary installation cables. The power cable should be connected
directly across the battery terminals to minimize ignition starting spikes and to prevent damage to the ignition
switch from the high current drain of the amplifier.
The red wire must be connected to the positive terminal and the black wire to the negative terminal. The amplifier
is designed for use only on vehicles with negative ground. A special version of all amplifiers is available for use on
vehicles with positive ground.
After the power connections are made, plug the antenna into the coax connector (RF OUT) of the amplifier. Then
connect the RF input cable to the RF IN jack. All of the amplifiers come pretuned from the factory. However, if
your SWR is more than 1.5:1, or if you are operating at a frequency not between 144 and 148 MHz, refer to the
tune-up instructions begore operating the amplifier.
Some exciters are very sensitive to different loads. Therefore if the power output is not what it should be, or if
the relay chatters, refer to the tune-up instructions.
TUNE-UP INSTRUCTIONS
To properly tune the amplifier, the following equipment is necessary. A thru-line wattmeter-an insulated tuning
tool (no metal tip) -a VOM-a regulated power supply for bench testing (adjustable) -and a 50 ohm dummy load.
During initial tuning the power supply should be set at no higher than 11 volts. If the amplifier is tuned in ave-
hicle, the engine should not be running.
Tune the Arco 403 and the Arco 404 at the RF INPUT jack for minimum reflected power, as indicated on the
thru-line wattmeter. Adjust the Arco 404 located in the center of the printed circuit board for maximum output
power ‘on the:wattmeter. Then tune the two Arco 404s in the output for maximum output power on the watt-
meter. Repeat these steps until the minimum reflected power and maximum output power occur simultaniously.
(L5, L6, L7, C8, C10, C11, C12, and C13 are found only in the commercial amplifiers)
CIRCUIT DESCRIPTION
The amplifier has an RF sensing circuit to provide automatic antenna switching and two RF amplifying stages
to operate Class C.
The incoming RF from the exciter is sensed by diode CR1 and the rectified output of the diode biases Q1 into
conduction, energizing the relay, Kl. With K1 energized, the incoming RF is switched to the input of the
amplifier. The 50 ohm input line is matched to the input of the driver transistor by a Pi network. The stage
Operates as a class C amplifier due to the inherent rectifying action of the base-emitter junction, allowing about
160 degrees of the incoming wave to bias the stage on. The output of the driver stage is matched to the input
of the final stage by an L network with the final stage operating just like the driver stage. The output of the
. final is then matched to the load:by an L network.
The commercial version of this amplifier has a Pi L filter in the output line and is AC coupled to the antenna
by a 1500 pf capacitor to eliminate the possibility of DC reaching the antenna from external keying circuits.
WARRANTY
Henry Radio warrants each new radio product sold by it to be free from defective workmanship and agrees to
remedy any such defect or to furnish a new part in exchange for any part of any unit of its sale which under
normal installation, use, and service discloses such defect, provided the unit is delivered by the owner to us in-
tact, for our examination, with all transportation charges prepaid to our factory, within ninety days from the
date of sale to the original purchaser and provided that such examination discloses in our judgment that it is
defective. Should a malfunction be suspected, write in detail to our service department for suggestions concern-
ing the operation, repair, or return of your unit, if it should prove necessary.
This warranty does not extend to any of our radio products which have been subjected to misuse, neglect, ac-
cident, incorrect wiring not our own, improper installation, or to use in violation of instructions furnished by
us, nor does it extend to units which have been repaired or altered outside our service department, nor in cases
where the serial number has been removed, defaced, or changed, nor to units used with accessories not man-
ufactured or recommended by us.
Any part of a unit approved for remedy or exchange hereunder will be exchanged by Henry Radio without charge
to the owner.
|
LEPEPDEL:
Woul f
11240 West Olympic Bivd. Los Angeles, Calif. 90064 213/272-0861
ar
CT-252-A-2 PARTS LIST
(Gal CAPACITOR: .01 mf. FBC CHOKE: Farreta bead.
C2 CAPACITOR: 110 pf.
CS CAPACITOR: .0O1 mf. Kl REEAY-= 2. DGaZPDi:
C4 CAPACITOR: 56 pf.
C5 CAPACITOR: 1 mf. L=StO COIL: Available from the manufacturer.
C6 CAPACITOR: .01 mf. Lehi
er: CAPACITOR: .001 mf
C8 CAPACITOR: 20 pf. Ql TRANSISTOR: 2N2222.
c9 CAPACITOR: .001 mf. Q2 TRANSISTOR: PT 3503.
E19 CAPACITOR: 35 pf. Q3 TRANSISTOR: PT 5649.
(CUAL CAPACITOR: 35 pf.
C12 CAPACITOR: 20 pf. Rl RESISTOR: 1Kohm.
G13 CAPACITOR: 1500 pf. R2 RESISTOR: 10 o0hm.
All variable capacitors are Arco 400 series. R3 RESISTOR: 2.7 ohm.
CRl DIODE: IN34. RFC CHOKE: 2.7 uh.
CT-252-A-2 SCHEMATIC
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SPECIFICATIONS
DRIVE POWER: 1 watt
VOLTAGE: 13.8 VDC
OUTPUT POWER: 25 watts
CURRENT: a 4 amps
> power supplies are designed for use with Tempo FM transceivers. The ACA delivers 13.8 VC
a 115 VAC power source with a current capacity of 4 amperes. The ACV delivers 13.8 VEL
a 115 VAC power source with a current capacity of 2 amperes.
-MATIC
D401-D404
i|
Speaker
— ~—
PO/ACA and TEMPO/ACV Parts List = ile
matic No. _
Description =
through C404
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ret
| through D404
j
nolder
Sink
r Cord
CAPACITOR: Feces 500 Hae 50 ie
CAPACITOR: Electrolytic, 25 mf, 30 volt.
OBR Re iO R: Electrolytic, 2 mf, 30 volt.
Top
Bottom
DIODE: Auto diode, 150 volt, 20 amp.
DIODE: Zener, 10 volt, 1 watt.
FUSE: 3 AG, 1 amp, 250 volt.
FUSE: 3 AG, 5 amp (ACV is 2 amp), 250 volt.
Black plastic.
3 AG fuse holder.
AC power cord.
PLUG: Speaker, mini phono plug.
PLUG: Power, plastic, 2 connector, 10 amp.
TRANSISTOR: Silicon, medium power, NPN, 60 v, CCL
TRANSISTOR: Same as Q3.
TRANSISTOR: Silicon, high power, NPN, 70 v, 10 amp.
RESISTOR: Carbon, 4.7 K ohm, ‘2 watt, 10%.
RESISTOR: Carbon, 560 ohm, !2 watt, 10%.
RESISTOR: Carbon, 820 ohm, !2 watt, 10%.
RESISTOR: Carbon, 2.2 K ohm, '2 watt, 10%.
3° x 5". 3.2 ohm, 5 watts.
TRANSFORMER: Primary- 115 VAC, Secondary- 25.2
volt, 3 amp ( 1.5 amp for ACV), 2500 volt test.
;
08 01390
08 05025
08 03051
48 20200
48 20201
73 00100
73 14740
24 30101..
~ 24 30150
36 00103
25 34204
48 20600
04 00100
16 90001
16 00002
72 00243
72 00243
72 00247
6& 40472
68 45600
68 48200
68 40222
-56 00103
84 21114
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