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Figure 2-1. Amplifier-Power Supply AM-2060(*)/GRC, block diagram.
Up
TM-11-5820-498-35 Radio Sets AN/VRC-53 AN/VRC-64 AN/GRC-125 and AN/GRC-160 and Amplifier Power Supply GROUPS 0A-3633/GRC and 3633A/GRC Manual
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CHAPTER 3. DS AND GS MAINTENANCE AMPLIFIER-POWER SUPPLY GROUP OA-3633(*) /GRC


TM 11-5820-498-35
required 13-volt output from the voltage regula-
volts that appears across resistor R19 is applied
tor.
to pin M of connector J2.
c. ANT. FREQ. CONTROL Switch S2. T h e
(2) Bias for Q4 is supplied from a voltage-
+25-volt dc input at pin J of POWER INPUT
dividing network composed of R9, R10, R11, and
connector J3 is applied through PWR circuit
R19 connected between the collector of Q3 and
creaker CB1 and switch S2 to the MX­2799/VRC
ground. Diode CR1 references the emitter of Q4
of the AT­912/VRC or to MX-6707/VRC of the
to ground. Diode CR2 references the base of Q4
AS-1729/VRC, whichever is connected to the
to the + 13-volt output. Regulating action is de-
AM­2060(*)/GRC. Switch S2 is set to the posi-
scribed in (3) below.
tion corresponding to the operating frequency of
(3) If the input voltage to Q3 decreases, the
the associated receiver-transmitter. Capacitors
13-volt output decreases. Capacitor C1, charged
C1 through C7 bypass radio frequency (RF) from
to the 13-volt level, will begin to discharge as the
the MX­2799/VRC or MX­6707/VRC to ground.
output voltage drops, tending to maintain a con-
stant output until the regulating action occurs.
2-11. Cable Assembly, Special Purpose,
As the output voltage decreases, the voltage drop
Electrical CS-4655/GRC
across R9, R11, and R19 decreases, reducing for-
ward bias on Q4, which will decrease its emitter-
The CX-4655/GRC (9 or 11 inches long) and the
to-collector current flow. The reduced emitter-to-
A M - 2 0 6 0 ( * ) / G R C comprise the OA-3633(*)/
collector current of Q4 reduces the voltage drop
GRC. The CX-4655/GRC is provided with two ca-
across resistor R6, increasing the forward bias of
Q3. Emitter-to-collector current flow in Q3 will
ble connectors either of which is connected to
increase, decreasing emitter-to-collector resist-
the  SET  POWER  connector  on  the
ance. The voltage drop through Q3 will decrease
AM­2060(*)/GRC; the other end of the cable is
and allow the output to return to the desired level
connected to POWER connector J3 on the re-
of 13 volts. If the supply voltage increases to the
ceiver-transmitter. The cable carries power, con-
normal 25.5-volt level, Q4 will decrease the for-
trol circuits, and audio signal circuits between
ward bias on Q3 to maintain the constant 13-volt
the AM­2060(*)/GRC and the receiver-transmit-
output. Resistor R10 is adjusted to produce the
ter.
2-13


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