RADIO RECEIVERS QUIZ

The controlled oscillator synthesizer is sometimes preferred over the direct one because

It does not require crystal oscillator

It is a simpler piece of equipment

It is relatively free of spurious frequency

Its frequency stability is better

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

Double-spotting

Diversion reception

Sensitivity

Blocking

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

Tracking will be improved

Image frequency rejection is very good

The selectivity will be poor

The local oscillator need not be extremely stable

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

Adjacent-channel rejection is more difficult

Production of AGC is a rather complicated process

The receiver cannot use a phase comparator for AFC

The transmission is not compatible with A3E

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One of the following cannot be used to demodulate SSB:

Complete phase-shift generator

Bipolar transistor balanced modulator

Diode Balance modulator

Product detector

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In a broadcast superheterodyne receiver, the

Mixer input must be tuned to the signal frequency

Local oscillator operates below the signal frequency

RF amplifier normally works at 455 kHz above the carrier frequency

Local oscillator frequency is normally double the IF

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The image frequency of a superheterodyne receiver

Is not rejected be the IF tuned circuits

Is created within the receiver itself

Is due to insufficient adjacent channel rejection

Is independent of the frequency to which the receiver is tuned

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

Because otherwise an intermediate frequency could not be produced

To help the image frequency rejection

To permit easier tracking

To allow adequate frequency coverage without switching

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

Negative-peak clipping

Poor AF response

Poor AGC operation

Diagonal clipping

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