THIRD, FOURTH, AND FIFTH IF AMPLIFIER, LIMITER, AND DISCRIMINATOR A4200

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

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THIRD, FOURTH, AND FIFTH IF AMPLIFIER, LIMITER, AND DISCRIMINATOR A4200 -

GERMANIUM TRANSISTOR VERSION.

THIRD, FOURTH, AND FIFTH IF AMPLIFIERS

The third, fourth, and fifth IF amplifiers provide the additional gain necessary to drive the limiter.

LIMITER AND DISCRIMINATOR

The limiter receives if input from the fifth if amplifier. The upper and lower peaks of the if waveform

are clipped by the limiter to provide a constant amplitude signal to the discriminator.

The discriminator is a Travis-type containing upper and lower tuned resonant tanks. When properly

alined, the output is the modulating intelligence with no dc offset. Any residual if is shunted to ground

by an rf trap.

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