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|  TM 11-5820-401-34-3/0967-LP-432-3060
1-24.
LOCAL OSCILLATORA 1500.
EL4G0202
The Local Oscillator A1500 assembly contains the following items:
1.
Tuning circuits
2.
Local oscillator
3.
Buffer Amplifier Q1502
4.
Buffer Amplifier Q1503.
TUNING CIRCUITS
The tuning circuits control the frequency of the oscillator. They contain resonant tanks with a
mechanical linkage from a variable inductor slug to the gear train linkage.
A feedback dc signal from the crystal reference system is applied
to a varactor (variable capacitance
diode) in the tuning circuits to alter the tank capacitance, thereby
changing the resonant frequency
and the operating frequency of the oscillator. The dc voltage from
the CRS keeps the oscillator running
to within 3.5 kHz of the frequency selected by the MC-TUNE-KC
control.
1-22
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