HUNT DISCRIMINATOR, PHASE DISCRIMINATOR; REFERENCE OSCILLATOR - WORKING EXAMPLE

TM 11-5820-401-34-3/0967-LP-432-3060

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CRS HUNT DISCRIMINATOR A3600, CRS PHASE DISCRIMINATOR A3700, AND REFERENCE

OSCILLATOR A2000. (CONT)

With the radio set to 30.00 MHz, the 5.65-MHz crystal is selected, causing the reference oscillator to

output a 5.65-MHz fixed frequency. Since the reference oscillator and limiter output frequencies are

the same, the phase discriminator does not output a dc voltage to the damping network. Therefore,

no dc voltage will be present at TP3001 due to phase discriminator action.

In actual operation, even with the local oscillator almost perfectly alined, a slight plus or minus dc

voltage is present at TP3001. Its presence is due to normal imbalances in the hunt discriminator and

phase discriminator circuits.

HUNT DISCRIMINATOR, PHASE DISCRIMINATOR; REFERENCE OSCILLATOR - WORKING EXAMPLE -

LOCAL OSCILLATOR RUNNING TOO HIGH

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