RT-178 / ARC-27 All schematics

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1 RT / ARC All schematics J I K P0 L A B M C P N D O E H G F P0 RT /ARC F L P0 A C D G J M P S B E K R H N SQ OFF GUARD REC MOD I k I B E i DRVR I g FINAL I g I ant SQ OFF MAIN REC SENS PHONE METER MIC SENS Phone 00Ω 0.W (W max.) Antenna (P0) 0Ω 0W Mic Ω Carbon Meter ma / Ω ( external meter! ) P0 ( insert ) P 0 ( insert ) A 0MHz bit a shaft h A MHz bit j B 0MHz bit b B tone relay C 0MHz bit c C MHz bit i D 0MHz bit d D guard relay E E T/R switch F F Hz bit l, shaft k G 0MHz bit e G Carrier received H 0MHz ambiguity H on/off relay I,V for ADF J audio out Phone J MHz bit g shaft j K aux audio out K MIC input L Hz bit o L 0Vdc for ADF M MHz bit k M ADF time constant N AVC test N gnd P MHz bit h O sens R Hz bit n P +.V / A S Hz bit m Frequency coding on next page

2 ARC Frequency coding 0Mc coding 0 0 Pin P0 a X X X X X X X X X A b X X X X X X X X X B c X X X X X X X X X C d X X X X X X X X X D e X X X X X X X X X G f * * X X X X X X X X H An X indicates that this line connects to ground in the control panel The remaining lines except line f are interconnected in the control panel * grounded for 0 and, but open for and times 0 Mc The open circuit seeking switch in the RT/ARC has positions and makes cycles. The unused positions of the second cycle are skipped automatically Mc coding 0 pin g X X X X J ( P0) h X X X X P ( P0) i X X X X C,, j X X X X A,, k X X X X M,, The meaning of X in the Mc coding depends on the 0.Mc selection. For xxx.0 thru xxx., the X lines connect to ground in the control panel The remaining lines interconnect For xxx. thru xxx., the X lines are interconnected in the control panel The remaining lines connect to ground in the control panel The inverted codes cause the Mc positioner to make a half step to tune the 00Mc first IF amplifier which has 00kc bandwidth The RT/ARC open circuit seeking switch has positions. The unused are skipped automatically 0. Mc coding Pin P0 l X X X X X F m X X X X X S n X X X X X R o X X X X X L An X indicates that the line connects to ground in the control panel The remaining lines are interconnected in the control panel. The RT/ARC open circuit seeking switch has positions. The unused are skipped automatically

3 D B P +V N H I Antenna P0 L 0MHz steps H G D C B A MHz steps M A C P J c steps Guard Tone L R S F K0 K0 Mechanical Tuner K0 K0 K0 Ein Ib MOD Ik DRVR Ig FINAL Ig I ant a b c d e f g h i j k l m n o p K0 00V 0V V uf 0.uF N V K0 K0 uh k 0 K0 0 sens fans and filaments 0Mc Power amplifier 0Mc 0Mc Guard Receiver 0V Main Receiver uf k 0mA uf 0.Ω 0k uf 00 Ω Hz oscillator and bias source n H n n 0k Spectrum amplifier 0 k + uf ma/ω 0.u 0 ma H 00Ω 0 +.V 0V Rx 0Ω K0 SQ OFF K0 V0 M Tone K0 E0 uf 0 Sidetone SQ OFF K0 0 V 00Ω 00Ω 00 Mc IF amp 0 V Modulator audio 00Ω 0 AUDIO nd IF d IF K0 AVC E K MIC Ω Carrier detected G M PUSH TO TALK J Phone K0 O K Aux out Sens ADF time constant N Coax Plug P 0 on front Plug P 0 on front RT / ARC Main Chassis aug 0 kb

4 RT / ARC Introduced in Frequency range. MHz in 0 steps of 0. Mc Tunable: 00. Transmitter 0W power into 0 Ω Modulation AM, or Hz tone Receiver.uV for db S/N Guard Receiver. uv for db S/N Audio output W max, 0.W at <0% distortion Modules RF receiver amplifier 00Mc IF Fixed IF and LF amplifier Spectrum oscilator Spectrum amplifier RF Power Amplifier Modulator Guard Rx Tone, bias and rela 00 MHz 0 V0 V0 V0 AQ 00Mc IF k 0. Spectrum gen ARC RF preamplifier V0 V0 V0

5 V0 V0 V0 J0. Mc n n +0 n n n n n n n n k k k n n k n n n E0 0 n R* Xtal* V0 0 Open circuit seeking switch S0 Rx AGC V0 V0 V0 V0 V0 V0 V0 V0 V0 V0 Xtal* R*. Mc ARC 00 Mc IF Amplifiers 0 kb +

6 K J0 k +.V Aux out 00kc 0.Vrms into 0 kω V V V.Mc k VB V k k 0 0 V0 V V 0 0 M 0 k AGC Filaments V0 V0 V0 V0 V0 k Rx p from last IF stage V0 k V0 V0 V V0 V0 db bandwidth > kc 0dB bandwidth < kc Sens µv to open squelch at db S/N k 0 k p nd IF amp.. Mc 0 V0 AL Noise Limiter k k p V AL.Mc k k ADF Time constant 0.uF V M 0 V0 k k V0 0v 0.uF 0 p.. =. Mc.. =. Mc k 0 0k k k 0v 0k k.mc k.. Mc In 0 steps each c VA E.V 0 0 k k k 00u 0 0v V0 DUAL MIXER 0 k 0 0.uF 0.uF V B Retransmit B +V mod only. MHz Rx 0 V k V0. / uh uh k 0.uF 0.uF 0 0k 0 k 0 k. MHz.0 MHz V0. / 0 0 SQ OFF A 0 00u Sidetone 0 0k k K0 M VB k RT /ARC Fixed IF and LF aug 0 kb Mod k E J0.V V Rx AVC 0V 0k VA 0k Guard audio k 0.u k. MHz 0k V0. / 0V. ma 0v 0. MHz k k tubes All triodes k k V AQ 00 sens Rx +0V IF and RF AVC 0v +0V J Phone W max Into 00 Ω

7 V0 V0 0 Mc 0 V0 0 0Mc 0Mc 0 0Mc 0Mc K0 K0 K0 K0 0 k V0 V0 00 MHz V0 0 Oven 0ºC 00u Mc k n n 0 x0 0 x x x x x0 0 0 x0 0 0 x0 0 0 x0 0 0 x0 0 x x x x x0 0 0 x0 0 0 x0 0 0 x0 0 0 x0 0 x0 +0 n n V +0V 0k 0 k 0 Mc 0k k V0 n 0 V0 0 n n n k n Mc K0 K0 K0 K0 k V k k V0 RT/ARC Spectrum generator and amplifier 0000 MHz V First LO to receiver +0V 00 +0V To Power Amp

8 POWER AMPLIFIER V0 C V0 C 00 MHz V0 C J0 0.Ω ANT 0k k.ω k k 00 0 k +V +0V +V +.V.V MODULATOR OUT TONE MIC V Retran 0 M V0 k +0V V0 F 0k K0 k *) k k k 0.uF V0. 0.uF V0 B 00 k 0 0.u 0k k 0 0V 0V meter 0V AGC 0 V0 V0 0 SQ OFF +V *) Relay K0 is optional, only fitted in sets for automatic retransmission

9 J0 u k MHz V0 Osc/doubler MHz 0k k 00 V0 AK RF AMP 0 J0 V 0 V V u k 0 k V0 V0 V0 V0 MIXER pf 0 V0 V0 V0 tripler. V0 V0 from Last IF stage. MHz V0. MHz E 0k k p V0 IF AMP 0 0k 0k. MHz V0. AL Noise Limiter p V0 AGC Amp k 0.uF V0 MIXER/OSC 0 00u 0 0v 0 p M 0.uF 0k 0k.0 MHz V0. AL AVC det E 0k k k 0v. MHz V0. / IF AMP 0v. MHz 0 k 0 k 0.uF M 00k 0.uF J0 k 0k 0 V0. / IF AMP AVC 0.uF k 0.uF k k k 0v 0 k. MHz 0 ma. ma V Squelch/Audio Guard Relay K0 gain +0v 0v audio Squelch off 0 (+.V) db bandwidth > kc 0dB bandwidth < kc Sens.µV to open squelch at db S/N 0 ARC Guard Receiver aug 0 kb

10 V0 V0 V0 V V0 V0 V0 AL V0 V0 V V V AL V0 V0 V V AQ IF & AUDIO AMPLR MOD V0 V0 V0 MAIN RECEIVER RF AMPLIFIER MOD & V0 V0 V0 V0 V0 V0 V0 00 MC IF AMPLR MOD V0 V0 V0 SPECTRUM OSC MOD V0 V0 V0 V0 V0 V0 V0 V0 SPECTRUM AMPLIFIER MOD V0 CA R V0 CA R V0 C POWER AMPLR MOD V0 V0 V0 B MODULATOR MOD V0 AK V V0 V0 V0 V0 V0 AL V0 AL V0 V0 V GUARD RECEIVER MOD +.V +0.V BIAS RELAY MOD V0 +.V +.V ( x.a = W).A.A.0A.0A Filament circuit RT / ARC

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