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Element 3: General Radiotelephone

effective 6/25/2009

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3-F-041: Receiver Theory

3-41F1: What is the limiting condition for sensitivity in a communications receiver?

The noise floor of the receiver.

The power supply output ripple.

The two-tone intermodulation distortion.

The input impedance to the detector.



3-41F2: What is the definition of the term “receiver desensitizing”?

A reduction in receiver sensitivity because of a strong signal on a nearby frequency.

A burst of noise when the squelch is set too low.

A burst of noise when the squelch is set too high.

A reduction in receiver sensitivity when the AF gain control is turned down.



3-41F3: What is the term used to refer to a reduction in receiver sensitivity caused by unwanted high-level adjacent channel signals?

Desensitizing.

Intermodulation distortion.

Quieting.

Overloading.



3-41F4: What is meant by the term noise figure of a communications receiver?

The level of noise generated in the front end and succeeding stages of a receiver.

The level of noise entering the receiver from the antenna.

The relative strength of a received signal 3 kHz removed from the carrier frequency.

The ability of a receiver to reject unwanted signals at frequencies close to the desired one.



3-41F5: Which stage of a receiver primarily establishes its noise figure?

The RF stage.

The audio stage.

The IF strip.

The local oscillator.



3-41F6: What is the term for the ratio between the largest tolerable receiver input signal and the minimum discernible signal?

Dynamic range.

Intermodulation distortion.

Noise floor.

Noise figure.





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Element 3: General Radiotelephone
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