Radio Receivers
If the intermediate frequency is very high (indicate false statement)

Image frequency rejection is very good
The local oscillator need not be extremely stable
The selectivity will be poor
Tracking will be improved

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

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

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Radio Receivers
In a ratio detector

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

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

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

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Radio Receivers
Show which of the following statements about the amplitude limiter is untrue:

The circuit is always biased in class C, by virtue of the leak-type bias.
When the input increases past the threshold of the limiting, the gain decreases to keep the output constant.
Leak-type bias must be used
The output must be tuned

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