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«ELECTRONICS TECHNICIAN Name
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ET FE 3
EXAMINATION
FM---Limiters---DC Clamping Pee t B\0 >
SPA AVS iM \we rey nvy,
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Brie in a FM signal corressponds to a change ins | 1 \ \
z amplitude? _4 Bulges , De | ff QEi “rrr Ore
aca aa Oa arma Rere 2E DErierL: On”
er ree WOH FIRS PION ve MORE Wee SE, TWE) IE A ges, IPE EMPASH 8
ee MOISE wWitHowT pKFRETUIME TOE ae RES POW cE.
ee detection of a FM signal can be accomplished byt ve7ewvs 9+ (6AT*
Dee Tere CHT FO THE DETECTE, so rT SPERATES ev THE
ee ree FR. CURVE (Diode DETECTOR)
ter stage operates with Low plate Y%t7Ase and its
a is tos age hh a de ee, PEAKS of ae Re wOee7e ae
a mein Beeantace of the a eee discriminator is: “9s @v4yY evel
Or RY 70 TUKE® AWAD TO OWLS EVE FKPREQIERM CY. THE
The reference voltage in a Foster-Seely discriminator is_[#e reweny joe ess
mee So ee
Bae schematic illustrates a_Sve7o Jere ore oF °
Ag teee ‘ :
ch eae , :
re the function of the following parts:
71. - fey PevGe CAPR Fe CovPle THE iif fro Ae CENTER TRF. GEC.
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a To WEEP THE CEvTER THPPED sfC, ABOVE Wik. GRovwD,
10CN4-3. > EL GW ATE THE AMPLITU D Peinr es CF THE FM WAVE, BY KEE:
ci ne TOME Ip Ee PF IP Ee © 3? nt ae reer , ; POE a
cs
= and 5. Ws a a a
#
ce
D sseribe the effect on frequency with a change in piate current for a
actance tube modulator and @ phase modulator, p= 7S VHT hme Fene BOT:
~ 2 FA CWRFIE, | Bre tWCIRERS E fC PZ ATE CORREMT We the IMCS EASE TAE Cae of {
ce L, te hI O LLL BFF ET UWWnl ie ¢ve%P: SPSL FY Lf LFF ECT ICM Cr PP ROMP D pre gee b
rE Tue £PR oF THE O8c1etATOR, yi (A PHASE MODULA T OTP mW 1 WORE
PT fC cS. wie POV AV OL THE Fee se PELE OF TF ME RF, wave THERE
tte tHe & Peg a. tow ; "|
mal cs of the fol owing: ( use separate sheet of paper for the balance
of the emamination) >
sie sortes diode pe eee |
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: Th hid
= ny Ae dante! inal 7 vi “4
5" i! Sey 1t ee ee. ee
ey cd a
Bhat i : OC i ms )
mation ( cont.) ;
& fi - | 1 nish
i a
Bod ao oe,
= ef | @
A pe he ; = ak
Yrew the characteristic curve for an overdriven amplifier:
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