HUNT DISCRIMINATOR, PHASE DISCRIMINATOR; REFERENCE OSCILLATOR WORKING EXAMPLE LOCAL OSCILLATOR AT CORRECT FREQUENCY

TM 11-5820-670-30

1-18. CRS HUNT DISCRIMINATOR A3600, CRS PHASE DISCRIMINATOR A3700, AND REFERENCE

OSCILLATOR A2000. (CONT)

HUNT DISCRIMINATOR, PHASE DISCRIMINATOR; REFERENCE OSCILLATOR WORKING EXAMPLE

LOCAL OSCILLATOR AT CORRECT FREQUENCY

EL1AT095

If the radio is set to 30.00 MHz, the local oscillator runs at 41.50 MHz, assuming that it is properly

alined. In this case, the limiter output is 5.65 MHz.

When 5.65 MHz is applied to the hunt discriminator through the buffer amplifier, no dc signal is fed

from the hunt discriminator to the damping network. Therefore, no dc voltage will be present at

TP3001 due to hunt discriminator action.

The same 5.65 MHz signal applied to the hunt discriminator is fed to the driver amplifier in the phase

discriminator module. This frequency is compared with the output of the reference oscillator which is

applied to buffer amplifier A3700.

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