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AM1780/VRC MAIN PWR Switch at NORM Position.
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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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Control, Intercommunication Set C-2297/VRC


TM 11-5820-498-35
To
From
Unit
Pin C
Pin C . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable (fig. 4-5, note 9) . . . . . . . . . . . . . .
Amplifier A80
J61, pin C . . . . . . . . . . . . . . . . . . . . . . .
C-2296/VRC . . . . . . . . . . . . . . . . . . . . . . .
a
Indicates parallel connection from CB501.
b
Indicates parrallel connection from J904 pin C.
b. AM-1780/VRC MAIN PWR Switch at INT
is inoperative, and only the intercom circuit is op-
ONLY. Under this arrangement, the radio circuit
erative.
To
Unit
From
MT-1029/VRC . . . . . . . . . . . . . . . . . . . . . . . . . .
J22, pin B
J21, pin B . . . . . . . . . . . . . . . . . . . . . . .
CX-4723/VRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  Pin B . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin B
S504, front
AM-1780/VRC . . . . . . . . . . . . . . . . .  J501, pin B . . . . . . . . . . . . . . . . . . . . . .
CB501
S504, front . . . . . . . . . . . . . . . . . . . . . . .
Interphone amplifier A520
CB501 . . . . . . . . . . . . . . . . . . . . . . . . .
J504, pin C
CB501 . . . . . . . . . . . . . . . . . . . . . . . . .
Pin C
CX-4723/VRC . . . . . . . . . . . . . . . . . .  Pin C . . . . . . . . . . . . . . . . . . . . . . . . .
Amplifier A80
C-2298/VRC . . . . . . . . . . . . . . . . . . . . . . .  J801, pin C . . . . . . . . . . . . . . . . . . . . . .
AM-1780/VRC . . . . . . . . . . . . . . . . . . . . .  CB501 . . . . . . . . . . . . . . . . . . . . . . . . .
J505 (J506, J507) pin C
Pin C
CX-4723/VRC . . . . . . . . . . . . . . . . . . . . .  Pin C . . . . .  b . . . . . . . . . . . . . . . . . . . . . .
.
Amplifier A80
C-2297/VRC . . . . . . . . . . . . . . . . . . . . . .  J904, pin Cb . . . . . . . . . . . . . . . . . . . . .
S901, rear (EXT position)
J904, pin C . . . . . . . . . . . . . . . . . . . . .
J901, pin C
S901, rear . . . . . . . . . . . . . . . . . . . . . . . .
Pin C
Cable (fig. 4-4. note 9) . . . . . . . . . . . . . . .  Pin C . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Amplifier A80
C-2296/VRC . . . . . . . . . . . . . . . . . . . . . . .  J61, pin C . .
a
Indicates parallel connection from CB501.
b
Indicates paallel connection from J904, pin C.
RADIO TRANS switch S502 is set to CDR ONLY
2-4. Receiver-Transmitter Control of Radio
or CDR + (plus) CREW, the INSTALLATION
Transmission and Microphone Signal Dis-
switch is set to OTHER, the MAIN PWR Switch
tribution, including Crewmember Control
is set to NORM, and the PWR CKT BKR switch
Boxes
CB501 is set to ON. When the PWR CKT BKR
The crewmember control boxes (C-2296/VRC,
switch is set to ON, dc power is applied to the am-
C2797/VRC, and C2298/VRC) provide a means
plifiers A80 in the control boxes (fig. 4-5), to en-
of keying the receiver-transmitter when the
able them to amplify the audio signals transmitted
audio accessory push-to-talk switch is set to radio
from the crewmember audio accessories. Received
position. Simultaneously, the speech signals ap-
signals (para 2-5), either from the receiver-
plied to the audio accessory microphone are ap-
transmitter or from other crewmembers in the
plied through the crewmember control box, the
system, are not amplified in the intercom receive
AM-1780/VRC, MT-1029/VRC, OA-3633(*)/
circuits.
GRC, and the transmit circuits of the receiver-
(2) Keying transmitter. When the audio ac-
transmitter to the antenna system.
cessory push-to-talk switch is depressed, a
Set
Intercommunication
a.Control,
ground is applied to the transmit circuits of the
C-2298/VRC.
receiver-transmitter, which, in turn, causes the
(1) Circuit setup. Control of the receiver-
transmitter to set up for transmit mode in order
transmitter from the C-2298/VRC crewmember
to permit speech signals ((3) below) to be ap-
b o x e s is possible when the AM-1780/VRC
plied to the distant radio station.
To
From
Unit
S801 (ALL and A positions)
J802, pin C . . . . . . . . . . . . . . . . . . . . . .
C-2298/VRC . . . . . . . . . . . . . . . . . . . . . .
J801, pin D
S801 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin D . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin D
CX-4723/VRC . . . . . . . . . . . . . . . . . . . . . . . . . . .
S502 (CDR ONLY or CDR +
J504, pin D . . . . . . . . . . . . . . . . . . . . .
AM-1780/VRC . . . . . . . . . . . . . . . . . . . . . . . . . . .
CREW position)
S501 (OTHER and INT positions)
S502 . . . . . . . . . . . . . . . . . . . . . . . .
S501 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
J501, pin S
Pin S . . . . . . . . . . . . . . . . . . . . . . . .
Pin S
CX-4723/VRC . . . . . . . . . . . . . . . . . . .
MT-1029/VRC. . . . . . . . . . . . . . . . . . . . . .
J24, pin S
J22, pin S . . . . . . . . . . . . . . . . . . .
See footnote at end of table.
2-4


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