Receiver-Transmitter Control of Radio Transmission and Microphone Signal Distribution, including Crewmember Control Boxes

TM 11-5820-498-35

From

Unit

Pin C

Pin C . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cable (fig. 4-5, note 9) . . . . . . . . . . . . . .

Amplifier A80

J61, pin C . . . . . . . . . . . . . . . . . . . . . . .

C-2296/VRC . . . . . . . . . . . . . . . . . . . . . . .

Indicates parallel connection from CB501.

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.

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 . .

Indicates parallel connection from CB501.

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

(fig. 4-5)

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.

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