Power Supply PP-3518/PRC-47 (A8A5)

TM 11-5820-509-35

megahertz frequency control knob on the front panel of

e. The 1-MHz pulse output from oscillator control

RT-671/PRC-47. The output frequency of the pulse

A7 is applied to the emitter circuit of pulse amplifier

amplifier remains in synchronism with the 1-MHz pulses

Q19. This grounded-base pulse amplifier provides

applied to its input, and limiters Q16 and Q17 clip the 5-

frequency multiplication since it is biased in its nonlinear

to 14-MHz output to maintain it at a constant level. The

character. The natural ringing frequency of the circuit is

resulting signal is routed to circuits in oscillator control

enhanced by the hi-Q tank components that are

A7 by follower Q18.

selected in 1-M Hz increments between 5 and 14 MHz

by the rotation of switch S9. This selection is made by

the whole

Figure 2-14. 5- to 14-MHz Amplifier/Limiter Circuit, Schematic Diagram.

2-12. Power Supply PP-3518/PRC-47 (A8A5)

(fig. 7-12)

is energized only in the transmit mode by operation of

a. The primary power input circuits to power supply

the push-to-talk relay (K1). A unique feature of power

A5 are conventional. Low voltage transformer T2 is

supply A5 is the same components are used regardless

energized continuously by the ac primary power source

of the type of primary power source connected to the

after closure of ac power control relay-K2, but high-

equipment. When an ac source is connected to the

voltage transformer T1

input terminals, transformer T2 is energized and

2-27