CHAPTER 3. CONTROL, RADIO SET C-2299/VRC

11-5820-401-35-1/NAVELEX

0967-432-3020

CHAPTER 3

CONTROL, RADIO SET C-2299/VRC

Section I.

CIRCUIT FUNCTIONING

RETRANS position. Under these conditions, the

3-1. System Application of C-2299/VRC

retransmission signals are available on the ALL

(fig. 3-1)

position of the crewmember control boxes.

The C-2299/VRC is used between receiver-trans-

mitters of Radio Sets AN/VRC-49 and AN/VRC-

32. Control, Radio Set C-2299/VRC, Circuit

45 to provide automatic retransmission of signals

Functioning

between radio sets that are too far apart to com-

(fig. 3-2)

municate directly with each other.

In the following discussion, the first receiver-

a. Receiver-Transmitter No. 1 and terminal

transmitter is identified as receiver-transmitter

radio No. 2 operate on one frequency (F1), and

No. 1 in figure 31 and the second receiver-trans-

receiver-transmitter No. 2 and terminal radio

mitter is identified as receiver-transmitter No. 2

No. 4 operate on another frequency (F2). For

in figure 31. Connections from the C-2299/VRC

retransmission operation, the radios in the sys-

are made direct to the radio mounts MT-1029/

tem must operate on squelch mode.

VRC or through the AM-1780/VRC to the radio

b. When the C-2299/VRC RETRANS switch

mounts. Figure 33 is wiring diagram of C-

is set to ON, the retransmission of signals and

2299/VRC.

keying control are automatically passed through

a. When RETRANS switch W701S702 is in

the C-2299/VRC to the retransmission site re-

OFF position, remote control of the receiver-

ceiver-transmitters. When the C-2299/VRC RE-

transmitters from the C-2299/VRC is possible.

TRANS switch is set to OFF, the user has con-

Resistors R702 and R703 terminate the receiver-

trol of the two receiver-transmitters from the

transmitters monitor amplifier output when RE-

audio accessories connected to the C-2299/VRC.

TRANS switch W701S702 is in OFF position to

In position 1 of RAD TRANS switch, receiver-

provide the same output impedance for the am-

transmitter No. 1 is controlled; in position 2 of

plifiers as when the switch is in ON position.

RAD TRANS switch, receiver-transmitter No. 2

When RETRANS switch W701S701 is in OFF

is controlled.

position, RAD TRANS switch W701S701 selects

c. Audio accessories can be connected to the

the receiver-transmitter to be controlled. Position

C-2299/VRC to enable the radio user to com-

1 selects the receiver-transmitter connected to

municate through the retransmission site receiver-

W701J701; position 2 selects the receiver-trans-

transmitters with the terminal radios. When the

mitter connected to W701J702.

C-2299/VRC RETRANS switch is set to ON, the

(1) When RAD TRANS switch W701S701 is

radio user cannot communicate with the terminal

at position 1, muted audio from the first receiver-

radios, but can hear the transmission occurring

transmitter is fed from terminal J of W701J701,

between the terminal radios.

through switch W701S701 and VOLUME control

d. However, when the C-2299/VRC is con-

R701, to terminals B and E of audio accessory

nected to the AM-1780/VRC of the radio-inter-

connectors W701J703 and W701J704, respectively.

com system the receiving circuits of the receiver-

When W701S702 is in OFF position, a push-to-

transmitters No. 1 and 2 are not available at the

talk switch of an audio accessory connected to

C-2299/VRC. Thus, radio communication is con-

W701J703 or W701J704 can control the first re-

ducted from the crewmember control boxes. Also,

ceiver-transmitter keying relay through terminal

for the retransmission operation, the INSTAL-

C of the connectors, switch W701S701, and ter-

LATION switch of the AM-1780/VRC is set to

minals S and L of connector W701J701. After the

3-1