Control, Frequency Selector C-2742/VRC, Circuit Functioning

TM 11-5820-401-35-1/NAVELEX 0967-432-3020

controls power to the RT-246(*)/VRC through

2-2. Control, Frequency Selector C-2742/VRC,

terminals N and P of connector J71. When S72

Circuit Functioning

is in the LO position, power is applied to the RT-

246(*)/VRC by grounding contact N of J71.

The C2742/VRC permits the selection of any

When S72 is in HI position, the RT-246(*)/VRC

one of the 10 preset frequencies on the RT

is turned on the high RF output power by ground-

246(*)/VRC and also controls power to the RT-

ing contact P of J71 through the contacts of K71

246(*)/VRC. Figure 23 is wiring diagram of

and S72. CONTROL indicator lamp DS71 lights

the C-2742/VRC.

to indicate that the C-2742/VRC has control of

the RT-246(*)/VRC. CHAN SEL switch S71

C-2742/VRC in System. M o m e n t a r y

a. One

functions similarly to the pushbutton switches on

switch SW S73 provides a means of operating

the RT-246(*)/VRC front panel by applying

latching relay K71. Switch S72 momentarily ap-

+25.5 volts dc through J71 to energize the relay

plies a ground to coil 7-10 of relay K71 to re-

in the RT-246(*)/VRC associated with the pre-

lease the locking mechanism and allow contacts

set channel selected. Diode CR71 prevents volt-

6-8 and 3-5 to come together. PWR switch S72

Figure 2-2. Control, Frequency Selector C-2742/VRC, schematic diagram.

2-2