TM 11-6625-3051-12
a. Continuous Mode. All five basic functional circuits are used in this mode and can be modulated or unmodulated.
The following paragraphs describe this mode and the block diagram shows signal flow:
(1) Main Generator Loop. Generates triangle and square waves. Controls main generator frequency of opera-
tion. Fm or PM inputs from modulation generator will frequency or phase modulate the main generator
loop output when selected. Produces triangle wave and square wave for input to Signal Shaper/Selector.
(2) Signal Shaper/Selector. Receives modulated or unmodulated triangle and square waves from main
generator loop. Uses triangle waveform to develop sine wave. Clips square wave to develop positive
and negative pulse waveforms.
(3) Multiplier. Receives FM modulated, PM modulated, or unmodulated triangle, sine, square, and positive
or negative pulse waveforms from signal shaper/selector circuit. Mixes an AM signal (when selected)
from modulation generator to the unmodulated signal from the signal shaper/selector for AM modula-
tion. Outputs low level signal to output amplifier.
(4) Modulation Generator. Generates internal FM or PM signals for modulating the main generator loop
for FM and/or PM modulation. Also generates an internal AM signal for mixing in the multiplier for AM
modulation. Front panel controls select either internal or external AM, FM, or PM modulating signals.
(5) Output Amplifier. Receives low level function waveforms from multiplier. Amplifies low level function
waveforms to power level necessary to drive external equipment.
b. Infernal Trigger Mode. Same as continuous mode but with the following differences:
(1) Main Generator Loop. Each internal trigger signal from modulation generator enables main generator
loop for one complete cycle of selected frequency.
(2) Modulation Generator. Provides an internal trigger signal to main generator loop for internal trigger
operation.
c. External Trigger Mode. Same as continuous mode but with the following differences:
(1) Main Generator Loop. Each external trigger signal from modulation generator enables main generator
loop for one complete cycle of selected frequency.
(2) Modulation Generator. Accepts trigger signals from external sources. Routes external trigger signal
to main generator loop for external triggered operation.
d. Infernal Gate Mode. Same as continuous mode but with the following differences:
(1) Main Generator Loop. Each internal gate signal from modulation generator enables main generator
loop for duration of internal gate pulse and the completion of the last cycle started of selected frequency.
(2) Modulation Generator. Provides internal gate signal to main generator loop for internal gated operation.
e. External Gate Mode. Same as continuous mode but with the following differences:
(1) Main Generator Loop. Each external gate signal from modulation generator enables main generator
loop for duration of external gate pulse and the completion of the last cycle started of selected frequency.
(2) Modulation Generator. Accepts gating signals from external sources. Routes external gate signal to
main generator loop for external gated operation.
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