Signal Data Translator CV-1377A/PRC-47 (A8A3)

TM 11-5820-509-35

Figure 2-10. If. Amplifier and Product Detector Circuit, Schematic Diagram.

2-11. Signal Data Translator CV-1377A/PRC-47 (A8A3) (fig. 2-11 through 2-14, 7-11)

hf oscillator signal is again divided with part of it being

a. Signal data translator A3 contains isolation and

routed to follower Q12 and the remainder being applied

amplifier circuits, transmit sod receive mixer circuits, the

to follower Q13. The appropriate output of these circuits

tuned rf amplifier and driver stages, and the hf oscillator

is controlled by the bias voltage that is applied to either

and buffer amplifier. Follower Q2 isolates the output of

the +20 vdc rcvr input or to the +20 vdc xmtr input as B

buffer amplifier Q21 and routes the hf oscillator signal

+ relay K5 on the main chassis is operated. Application

through amplifiers Q3 and Q4 to follower Q5 and to the

of this bias voltage to Q12 as the receive mode is

oscillator control circuits (pare 2-14d ). This 2.5-to

selected enables the follower and places a forward bias

12.499-MHz signal branches at the emitter of follower

on CR6 that disables this gate. The hf oscillator signal

Q2 and is amplified by Q6 and Q7 before being routed

is then routed to the receiver mixer (Q11). When the

to the transmitter and receiver mixer circuits by follower

transmit mode is enabled, +20 vdc smtr input from

Q8. At the emitter of Q8, the

connector P1-2 is applied to follower Q13 and a forward

bias is placed on diode CR5. The transmit mixer input

is made operative and the receiver mixer is disabled.

2-21