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

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

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Radio Receivers
Indicate the false statement in connection with communications receivers.

Variable sensitivity is used to eliminate selective fading
The noise limiter cuts off the receiver’s output during a noise pulse.
Double conversion is used to improve image rejection
A product demodulator could be used for the reception of Morse code.

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Radio Receivers
Indicate the false statement. Noting that no carrier is transmitter with J3E, we see that

Adjacent-channel rejection is more difficult
The transmission is not compatible with A3E
Production of AGC is a rather complicated process
The receiver cannot use a phase comparator for AFC

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Radio Receivers
The local oscillator of a broadcast receiver is tuned to a frequency higher than the incoming frequency

To help the image frequency rejection
To permit easier tracking
To allow adequate frequency coverage without switching
Because otherwise an intermediate frequency could not be produced

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