Section III. OPERATION - TM-11-5820-554-120073

TM 11-5820-554-12

Figure 10-5. Wattmeter Interconnections.

Section III. OPERATION

g. Slowly adjust the VOX BAL control until the

10-6. Phone Patch Operation of Collins

relays stop tripping.

312B 4/5 With Collins KWM-2/2A

h. Repeat f and g above, until it is no longer

possible to advance the VOX GAIN control without

Set the EMISSION switch to LSB,

causing the relays to trip.

ANTIVOX GAIN at minimum, MIC GAIN at

NOTE

minimum, VOX GAIN at minimum, and RF GAIN

1. The phone patch will balance on the

and AF GAIN as required for normal operation.

average telephone line with the circuit

b. Set the FUNCTION switch to CAL, and tune

capacities provided. Unusual line

in the calibrate signal to produce approximately a

conditions may require a change in

900-Hz audio tone.

capacity to compensate for these

c. Set the VOX BAL control on the Collins

conditions. If necessary, cut C7 loose,

312B -4/5 /5 fully counterclockwise.

or add the extra capacitor (furnished)

d. Lift the telephone handset, and dial a single

in parallel with C6 and C7 to produce

digit to remove the dial tone.

a null within the range of the VOX

e. Set the PHONE PATCH switch to ON.

BAL control.

f. Advance the VOX GAIN control on the

More precise balancing may be

transceiver until the vox relays begin to trip back

obtained if an a.c. vtvm is used.

and forth between receive and transmit positions.

Connect

10-6