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Receiver-Transmitter Received Audio Signal Distribution, Including Crewmember Boxes
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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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Retransmission Using RT-505/PRC-25's or RT-841/PRG-77's


TM 11-5820-498-35
c. Muted Audio Signals to Crewmember Con-
the crewmembers can be heard over the radio
trol Boxes. When a crewmember control box
audio signals, since both sources of audio signals
MONITOR switch is set to ALL position, muted
are avaiIable when the crewmember control box
audio signals (reduced strength by passage
MONITOR switch is set to ALL position. Muted
through R15 in AM-2060(*)/GRC) can be heard
audio signals received at the receiver-transmitter
at the audio accessory at each crewmember con-
are distributed to the crewmember control boxes
trol box. The receiver-transmitter audio signal is
as follows:
reduced so that the intercom audio signals among
From
To
Unit
Receiver-transmitter . . . . . . . . . . . . . . . . . .
Module A25/A55 . . . . . . . . . . . . . . .
J9, pin B
Pin B . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CX-4655/GRO . . . . . . . . . . . . . . . . . . .
Pin B
AM-2060(*)/GRO . . . . . . . . . . . . . . . . . .
J2, pin B . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio amplifier Q1, Q2
Audio amplifier Q2 . . . . . . . . . . . . .
R15 (muting resistor)
R15 . . . . . . . . . . . . . . . . . . . . . . . . . . .
J9, pin K
Pin K . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin K
CX-4723/VRC . . . . . . . . . . . . . . . . . . . .
S608 (OFF position)
AM-1780/VRC . . . . . . . . . . . . . . .. . . . . . . .
J501, pin K . . . . . . . . . . . . . . . . . . . . . . . . .
K502, terminals 18 and 19
S503 . . . . . . . . . . . . . . . . . . . . . . . . . .
Interphone amplifier A520
K502, terminal 19 . . . . . . . . . . . . . . . . .
Interphone amplifier A520a . . . . . . . . .
J504, pin L
Pin L
Pin L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CX-4723/VRC
...............
S801 (ALL position)
J801, pin L . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-2298/VRC . . . . . . . . . . . . . . . . . . . .
R801 (VOLUME control)
S801 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
R801 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
J802 and J809, pins B and E to
audio accessory earphone
a
J506 (J506, J507), pin L
AM-1780/VRC . . . . . . . . . . . . . . . . . . . . . . . .  Interphone amplifier A520 . . . . . . . .
Pin L
CX-4723/VRC . . . . . . . . .. . . . . . . . .  Pin L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S902 (ALL position)
C-2298/VRC . . . . . . . . . . . . . . . . . . . . . . J904, pin L . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S902
R902 (VOLUME control)
. . . . . . . . . . . . .. . . . . . . . .
R 9 0 2  . . . . . . .. . . . . . . . . . . . . . . . . .
J902 and J903, pins B and E, to
audio accessory earphone
S902b . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S901 (EXT position)
S901 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
J901, pin J
Pin J . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin J
Cable (fig. 4-6, note 7) . . . . . . . . . . . . . . . . .
J61, pin J . . . . . . . . . . . . . . . . . . . . . . . . . .
R61 (VOLUME control).
C-2296/VRC . . . . . . . . . . . . . . . . . . . . . . . . . . .
TB61, pin 5
R61 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-207/VRC earphone
TB61, pin 6 . . . . . . . . . . . . . . . . . . . . . . . . .
a
Indicates parallel connections from interphone amplifier A520.
b
Indicates paralled connections from S902.
Section II. RETRANSMISSION CIRCUIT FUNCTIONING
used to provide the connection between the re-
2-6. Radio Retransmission Circuits, General
c e i v e r - t r a n s m i t t e r s at the relay site. The
MK-456/GRC consists of a canvas bag and a 50-
a. The receiver-transmitter in the AN/VRC-53,
foot Cable Assembly, Special Purpose, Electrical
A N / V R C - 6 4 , AN/GRC-125, and AN/GRC-160
CX-4656/GRC. Two circuit boxes, a choke box,
can be connected with another receiver-transmit-
and filter box (fig. 4-7) are included in the cable
ter for the purpose of setting up a radio relay site
assembly. An audio accessory can be connected to
for automatic retransmission of radio signals
the receptacle on the choke box to monitor audio
from radio stations that are too far distant from
signals applied through the retransmission cir-
each other for direct radio communication. The
cuits. When the two radios at the relay site are
other receiver-transmitter at the relay site can be
set up for providing retransmission to the two
t h e RT-505/PRC-25 or RT-84/PRC-77 (para
distant radio stations, the keying of one relay site
2-7),  or  it  can  be  the  RT-246(*)/VRC  or
receiver-transmitter to send the signals to one
RT-542(*)/VRRC
(para
from
the
distant radio station is automatically arranged by
AN/VRC-12 radio series. (RT-246(*)/VRC and
the other relay site receiver-transmitter that i
RT-524(*)/VRC represent all models of each re-
receiving the signal from the other distant radio
ceiver-transmitter.)
station.
b. Retransmission Cable Kit MK-456/GRC is
2-8


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