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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