Radio Receivers
Indicate the false statement. The superheterodyne receiver replaced the TRF receiver because the latter suffered from

Insufficient gain and sensitivity
Instability
Inadequate selectivity at high frequencies
Gain variation over the frequency coverage range

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Radio Receivers
In a ratio detector

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

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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 selectivity of the receiver
Reducing the effect of negative-peak clipping
Improving the effectiveness of the AGC

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Radio Receivers
In a radio receiver with simple AGC

An increase in signal strength produces more AGC
The faster the AGC time constant the more accurate the output
The highest AGC voltage is produced
The audio stage gain is normally controlled by the AGC

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