The N/R- Module ircuit iagrams. Tone squelch (selective call). Homing. High requency oscillator HO. Low requency Oscilator LO. Variable I amplifier. R mplifier. Mechanical Tuning Unit. Power mplifier. R subframe 0. Main chassis ixed I Receiver udio. Transmitter udio Power Supply Unit. Harmonic ilter
High requency Xtal Oscillator.0.0 MHz in 0 steps of MHz Low requency Xtal Oscillator khz in 0 steps of 0 khz R 0.00. in 00 channels of 0kHz Variable I khz ixed I 00 khz Harmonic filter Power mplifier Homing M detector PSU High requency Oscillator HO Low requency Oscillator LO Tx mixer Rx mixer R mplifier 0-0 MHz Tx udio RT / R- Tx mixer M osc Rx mixer Variable I.. - MHz Mechanical Tuning unit M et. ixed I 00kHz Squelch gate Rx udio Tone squelch requency control Squelch control
TR /- V V SQ J rom I M detector k 0 0 k u k V a V b Q0 u 0u k k 0 p 0k Q0 k k R0 Q0 k Q0 R0 k k R k 0µH u 0.u 0Hz ilter or oscillator 0.u Noise u Q0 0k k 0u 0 Hz k Q0 k 0 k u 0k Tx tone Rx tone 0 meter k Tx tone receiver audio R0 Tx 0Hz R0 Rx andw R Rx 0Hz SQ-IS N 0 u 0 u k khz 00p u k k u Q0 k ll transistors N Unit V TON/NOIS SQULH pril 0 kb
G V Rx V 0 K0 k 00 Q0 N V V k 0m 00 Q0 N 0k 0 u u 0 Q0 N P0 00 Hz 0-0 MHz - Homing antenna S Towel rack P0 n n n Ω P0 0 J0 K0 J0 x N0 Whip antenna S 0 Via coupler U-/R rom Transmitter To receiver I- Signal strength rom ixed I 0 k n P0 0k R 0k 0uH 00 khz k k 00p 00p 0k Q0 k k 0 00p 0p 00p n n 0p M-out J0 0.u M etector k k u k 0k n u Q0 00 k R ourse Sens. K0 0.u k k k R J0 J0 R- Homing module pr 0 kb I- ourse indicator Testpoint Pin on module connector P0 0 P0 P0 J 0 on top of module P 0 on bottom edge of module
meter n n n n k n Q0 N k k p n 0.0 xtalls in.0 MHz steps MHz.0..0 in 0 MHz steps of MHz k 0 HO Unit 0.0 MHz 0.0 Xtal freq HO ilter freq. 0 0 0 Position tuning shaft (degrees) ll diodes N Gold bonded germanium TR V G Gnd from var I ( Tx mode) P0 P0 k p k 0k Q0 N (germanium PNP) 0k 0k k k 0k k k u p p k 00 Q0 N k k k p k Q0 N k k p n k k Q0 N k 0k 0k p k k k Q0 N n Unit n 00 to Var I - MHz P0 J0 to Tx Power mpl R- R mplifier and High requency Oscillator march 0 kb
- test gnd TR G rom sidestep osc. J0 J0 rom R ( Rx mode) 0n n 0 k n mh 0 0p : mh 0n 0 k k Xtal selector n n k k k n k Q0 N 0n Q0 N (germanium PNP) 0 00 0 0 00 Low requency Oscillator µh µh 0µH 0 0 0 mh 0 k 0n 0 0 0 xtalls in 0kHz steps from to khz k 00 0 0 00 n n k n n n 0k n 0n k ll diodes N 0n k 0n k Q0 N 0n k 0k k 0k 0n 0 khz Xtal freq 0 0 0 k Position tuning shaft (degrees) k 0n k 0n 0k mh 0n Q0 N n ilter freq. 0 k To fixed I (00kHz) 0 to R (Tx mode) J0 J0 Variable I. amplifier Unit R- Var I. and Low requency Oscilator march 0 kb
Q0 Q0 Q0 0. 0 00V 00 0 V meter - V gnd 0k 0k 0 00 0k To Harmonics filter 00 k 0 Q0 00 k 0 Q0 k 0k k k Q0 Tube heaters.v 0..V 0..V 0. //0 kb R- R Power mplifier
To M detector for homing audio out to tone and Rx audio n eramic filter 00kHz andwidth 0kHz TL0- n Q0 k n k mh 0 k k n n n n k k Q0 n k n k mh n V Q0 k k k mh k n k n k Q0 0 k mh n 0 n.v ( no signal) V ( -0dm R input).v ( -0 dm) n k G det n Q0 k k k n 0 Q0 n k Q0 k 0k k 0 00 00 oster Seeley M detector n n V 0k k u k k k Q0 G ncoded audio preamp u 0 u 0k Q0 0 k k mh G to VRI and R ampl u ux out G meter Homer strenght V ll 0 transistors N n k k u 0 Q0 u Unit R- ixed I module feb 0 kb
tone dis carr TR bus Squelch mode UIO IN J0 k u 00k 00k k 00k k n k u Q0 u k 0k 00 k u u u Q0 u Q0 00k k u carr k tone k k k 0.u k SQULH k k 0.u k k 0k k 0u u GIN 0 k 0u k Q0 0u 0u k 0 0 k Q0 N 0 Q0 N n n k V RTRN K 0 0 Ω 0mW.V To PTT 00k Other set ll transistors N n u Side tone and tuning tone Q0 MP RIVR J0 J0 J0 Module 0 Sidetone and channeling tone K0 0 Main R connector Module connector Module testpoint R- Receiver udio March 0 kb
Side tone disable from harm. udio in 0 To Rx audio Security input 0Hz tone 00 0k 00 0k k k k 0n 0k n Side tone disable by security box 0 k k.u k 0k µ µ µ k k Q0 N 0.µ µ k µ k 0 k 0µ Q0 N J0 k 0.µ 0 k.v k n V- PS p k meter 00 0 00kHz k Q0 N M Sidestep oscillator k u 0n V 00 mh 00 0 00u 0 J0 k m 0 K0 V K 0 K00 tone dev n PR-MP µs NORML R- Transmitter udio March, 0 kb V
0.u lower V 00 0 00 PTT K00 K00 Q0 N Q0 N J0 K k k N 0V J0 u J0 0 0 T Q0 N 00 Hz T Q0 SP0 k 0u e-spiler 0u k 0 K 0u K u V in J0 TX Only 00V T 00k J0 u 0V 00k meter x N Ω J0 - V V Tuning tone ~ ~ m L00 00V 0V heaters -V Tuning motor K00 Power mplifier Homer - K00 Tx audio TR K00 controls the ±V TR bus K00 is the antenna ( coax) relay K enables the 00 and 0V R- Power Supply --0 kb
0.µH 0.µH 0.µH 0.µH MHz cut-off rom P p p 0 0.µ 0.µ 0.µH 0.µH p p p p p 0 MHz cut-off p n 0.µH To TR relay k n k p k blue Gray (reflected) White ( orward) 0 M 0. V R- Harmonic ilter 0-0-0 kb Tx
0.u lower V PTT <MHz 00 Q0 N k Q0 N k J0 N 0V 0 0 J0 T J0 Q0 SP0 00 Hz T k 0u e-spiker Q0 u, N..Volts.. Volts. LO. HO. TON OS. G. MO. P GRI. 00V 0. R W. R RL O Ω Xmit test u 00 K00 Main in (0 Ω ) 00 Ω 0 Ω K00 ntenna oax relay 0u k 0 K0 0 0 0k k 00µ k HRM.ILTR UIO TX -V W RL k N00R ux in (0k ) 00 Ω 0 V - V J0 0u G Power Supply Module () 0 0k V K00 0Hz L00 K00 sidetone T TR bus UX OUT 0 TX Only, u 0 Ω HO LO IX I R Sub chassis 00V 00k 0V 00k, J0 J0 Power mplifier (fil) R MPL SL LL ( tone squelch) 0 UIO RX 0 MHNIL TUNING UNIT m VR I HOMR 0 0 0 0 SQ J k SQ IS Main out (0 Ω ) 0 Odd ven 0 OPR MHz select 0 khz select mb mb I- 0 to KY coder (option) pin of 0-pole Main onnector 0 RTRN / SQULH control RT- / R- MIN HSSIS N POWR SUPPLY Oct, 0 kb
R- R- JJ O PTT RTRN HOM VOL 0 N y KK q - intercom amp PTT x d v - -0 0 PP c w u Second - or -0 Receiving a signal IS TON RR 0 *) Z Y V,r X W IS TON RR HH Retransmit interconnections Power Homing LGS HOR VRT Harm.ilter mb mb Odd ven 0 0,G *) *) *) e f GG H, t s I- MM NN K J G k m LL h i P R S T U k < MHz MHz Select details on page 0kHz select Homing only Lamps H g M L j z a G V H J V ntenna tuner U or U Pins not used in - p. n, Pins not used in -0 K,W, h, i, r, p,n, - / R- -0 / R - ontrol Panels *) Not in -0 b --0 kb