PREFERRED AND ALTERNATE METHOD OF TUNING

TM 11-5805-387-10-2

2-10. PREFERRED AND ALTERNATE METHOD OF TUNING

Use the preferred method to tune the signal.

If the scope is not working, the preferred method cannot be used

to tune the signal. Use the alternate method (para 2-10b.)

a. PREFERRED METHOD

Tune the receiver-transmitter until you get a correct trace pattern on

the scope.

NOTE

When the modem is warmed up, 5 minutes will

be necessary for the BFO to stabilize. If the modem

is cold, 15 minutes will be necessary for BFO to

become stable. Make necessary adjustments during

these time periods to maintain the best signal recep-

tion display on the scope.

. In 850-Hz mode only, use the modem BFO control to aid fine tuning,

until you get a correct trace pattern. In all other modes, tune with

FREQ VERNIER control on receiver-transmitter.

CAUTION

Adjust SCOPE INTENSITY control to the MINIMUM

level necessary for adequate display to avoid damage

to the face of the cathode ray tube (CRT).

2-18