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TM 11-5820-401-34-3/0967-LP-432-3060
LOCAL OSCILLATOR AFC/CRYSTAL REFERENCE SYSTEM. (CONT)
1-15.
The hunt discriminator can coarse tune the local oscillator when its frequency error is within
400 kHz.
FINE TUNING THE LOCAL OSCILLATOR
The hunt discriminator is sensitive to large errors in local oscillator frequency, while the phase dis-
criminator (14) responds to small errors. The phase discriminator compares the fixed output of the
reference oscillator (15) with the variable output of the limiter (10). When the two input signals are of
unequal frequency (due to incorrect local oscillator frequency), the phase difference causes the
phase discriminator to output a dc error voltage which is applied to the local oscillator to bias it into
correct frequency operation.
1-16.
CRS BALANCED MIXER A3200.
12 HARMONICS
FROM A3100
HARMONIC
GENERATOR
41.50 TO 64.45
MHz FROM
LOCAL OSCILLATOR
The balanced mixer accepts inputs from the following two sources:
1. The local oscillator through the high-pass Filter FL3002.
2. The harmonic generator.
Local oscillator signals are applied to the mixer through a buffer amplifier to prevent loading down the
local oscillator. Twelve frequencies, 1 to 12 MHz, are applied to the mixer along with the local
oscillator's output. The signals are heterodyned to produce four strong mixed output frequencies.
BALANCED MIXER OPERATING EXAMPLE
Assume that the radio is tuned to 30 MHz, in which case the local oscillator runs at 41.50 MHz. The
41.50-MHz frequency is mixed with 12 signals generated by the harmonic generator, producing mixed
output containing each of the 12 harmonics, the local oscillator frequency, and sum and difference
frequencies listed below.
1-9


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