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Radio Receivers

Radio Receivers
A receiver has poor IF selectivity. It will therefore also have poor

Double-spotting
Diversion reception
Blocking
Sensitivity

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Radio Receivers
The frequency generated by each decade in a direct frequency synthesizer is much higher than the frequency shown; this is done to

Reduce the number of decades
Reduce the number of crystals required
Increase the frequency stability of the synthesizer
Reduce the spurious frequency problem

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Radio Receivers
An AM receiver uses a diode detector for demodulation. This enables it satisfactorily to receive

ISB
Single-sideband, full-carrier
Single-sideband, reduced-carrier
Single-sideband, suppressed-carrier

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Radio Receivers
When a receiver has good blocking performance, this means that

It is unaffected by AGC derived from nearby transmissions
Its image frequency rejection is poor
It does not suffer from double-spotting
Its detector suffers from burnout

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Radio Receivers
A low ratio of the ac to the dc load impedance of a diode detector results in

Negative-peak clipping
Poor AF response
Diagonal clipping
Poor AGC operation

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Radio Receivers
The typical squelch circuit cuts off

RF interference when the signal is weak
an audio amplifier when the carrier is absent
An IF amplifier when the AGC is minimum
An IF amplifier when the AGC is maximum

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MORE MCQ ON Radio Receivers

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