Externally Modulating Rf Signal Generator; Voice Modulating Rf Signal Generator - IFR FM/AM-1200A Operation Manual

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4-6-4 EXTERNALLY MODULATING RF SIGNAL GENERATOR
STEP PROCEDURE
1. Perform steps in "SIGNAL GENERATOR OPERATION''.
2. Apply external modulation signal to EXT MOD/SINAD Connector (15).
Insure VAR Tone Selector Switch (5) and 1 kHz
Tone Selector Switch (7) are positioned to "OFF''.
3. Adjust output of applied modulation signal to desired modulation
level, as reflected on MODULATION Meter (1) and Scope Display
( 3 1 ) •
4-6-5 VOICE MODULATING RF SIGNAL GENERATOR
STEP PROCEDURE
1. Perform steps in "SIGNAL GENERATOR OPERATION''.
2 •
3 •
4-38
05
Connect external microphone to MIC/ACC Connector (19).
Press PTT (Press-To-Talk) Switch (on microphone) and speak into
microphone. Use monitoring features outlined in Table 4-7 to
monitor voice modulation characteristics.
Diode speech limiting is incorporated within
FM/AM-12005/A circuitry for control of peak
modulation. The limiter is set for 6 kHz
deviation.
Whenever microphone is keyed, the FM/AM-1200S/A
will automatically switch to the generate mode
of operation, if the MODE Selector Control (39)
is in the "REC" or "DUP" position. The generate
mode cannot be overridden by applying power
transmission at the T/R Connector (11).