Performance limitations - instability, image, spurious, etc.
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A-006-05: Performance limitations - instability, image, spurious, etc.

A-006-05-01: What part of a superheterodyne receiver determines the image rejection ratio of the receiver?

RF amplifier

Product detector

AGC loop

IF filter



A-006-05-02: What is the term for the reduction in receiver sensitivity caused by a strong signal near the received frequency?

Desensitization

Cross-modulation interference

Squelch gain rollback

Quieting



A-006-05-03: What causes receiver desensitization?

Strong adjacent channel signals

Squelch gain adjusted too high

Squelch gain adjusted too low

Audio gain adjusted too low



A-006-05-04: What is one way receiver desensitization can be reduced?

Shield the receiver from the transmitter causing the problem

Decrease the receiver squelch gain

Increase the receiver bandwidth

Increase the transmitter audio gain



A-006-05-05: What causes intermodulation in an electronic circuit?

Nonlinear circuits or devices

Too little gain

Positive feedback

Lack of neutralization



A-006-05-06: Which of the following is an important reason for using a VHF intermediate frequency in an HF receiver?

To move the image response far away from the filter passband

To provide a greater tuning range

To tune out cross-modulation distortion

To prevent the generation of spurious mixer products



A-006-05-07: Intermodulation distortion is produced by:

the mixing of more than one signal in the mixer of a superheterodyne receiver

the interaction of products from high-powered transmitters in the area

the high-voltage stages in the final amplifier of an amplitude or frequency-modulated transmitter

the mixing of more than one signal in the first or second intermediate frequency amplifiers of a receiver



A-006-05-08: Three of the following answers are direct causes of instability in a receiver. Choose the answer which is NOT a direct cause:

dial tracking

mechanical strength

feedback components

temperature



A-006-05-09: Poor stability in a receiver usually originates in the:

local oscillator and power supply

detector

RF amplifier

mixer



A-006-05-10: Poor dynamic range of a receiver can cause many problems when a strong signal appears within the front-end bandpass or even outside it. Which of the following is NOT caused as a direct result?

Feedback

Desensitization

Intermodulation

Cross-modulation



A-006-05-11: If a receiver mixes a 13.800-MHz VFO with a 14.255-MHz received signal to produce a 455-kHz intermediate frequency (IF) signal, what type of interference will a 13.345-MHz signal produce in the receiver?

Image response

Intermediate interference

Mixer interference

Local oscillator





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