Radio Receivers
Indicate which of the following circuits could not demodulate SSB:

BFO
Balance modulator
Product modulator
Phase discriminator

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Radio Receivers
In a ratio detector

the linearity is worse than in phase discriminator
the circuit is the same as in a discriminator, except that the diodes are reversed
the output is twice that obtainable from a similar phase discriminator
stabilization against signal strength variations is provided

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Radio Receivers
If a FET is used as the first AF amplifier in a transistor receiver, this will have the effect of

Reducing the effect of noise at low modulation depths
Improving the effectiveness of the AGC
Improving the selectivity of the receiver
Reducing the effect of negative-peak clipping

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