VHF TUNER POWER SUPPLY MODULE A1600.

TM 11-5820-670-30

1-54. RETRANSMIT OPERATION. (CONT)

With K5502 energized, the retransmit control ground, which originates in the receiver-transmitter

during the receive condition, is applied through contacts 5 and 6 of K5502 and then through the con-

trol units to transmitter key relay K9602 in radio set no. 2.

Simultaneously, the received audio signal is coupled from radio set no. 1 through the control units to

the transmitter circuits of radio set no. 2 for transmission.

The retransmit control ground, placed on radio set no. 2, simultaneously keys the transmitter circuits

and removes the ground applied to squelch relay K5502 when radio set no. 2 is in the receive

condition.

When radio set no. 2 is in the transmit condition, the sidetone gate circuits (not shown) operate relay

K5502. Breaking the groundpath applied to relay K5502 in radio set no. 2 prevents radio set no. 2 from

energizing the transmit circuits of radio set no. 1. After retransmission has ceased, radio set no. 2

will return to the receive condition.

With both radio sets in the receive condition, either radio set can receive a signal and transmit it to the

other radio set. The radio set that receives the signal first is tuned to the frequency being transmitted

to the relay station.

1-55. VHF TUNER POWER SUPPLY MODULE A1600.

EL1AT134

Vhf tuner power supply A1600 supplies biasing voltages to vacuum tubes located in modules A1200,

A1300, and A1400. The power oscillator outputs a 1000 Hz square wave when +24 vdc biases the

stage. The 1000 Hz square wave is rectified in the full wave bridge rectifier where an output of

approximately 110 vdc at 100 mA is applied to the vhf tuner.

1-59