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

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

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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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