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Canadian Advanced Exam Question Bank

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A-006-03: RF, IF amplifiers, selectivity

A-006-03-01: What is meant by the noise floor of a receiver?

The weakest signal that can be detected above the receiver internal noise

The weakest signal that can be detected under noisy atmospheric conditions

The minimum level of noise that will overload the receiver RF amplifier stage

The amount of noise generated by the receiver local oscillator



A-006-03-02: Which of the following is a purpose of the first IF amplifier stage in a receiver?

To improve selectivity

To tune out cross-modulation distortion

To increase dynamic response

To improve noise figure performance



A-006-03-03: How much gain should be used in the RF amplifier stage of a receiver?

Sufficient gain to allow weak signals to overcome noise generated in the first mixer stage

As much gain as possible, short of self-oscillation

It depends on the amplification factor of the first IF stage

Sufficient gain to keep weak signals below the noise of the first mixer stage



A-006-03-04: What is the primary purpose of an RF amplifier in a receiver?

To improve the receiver noise figure

To vary the receiver image rejection by using the AGC

To develop the AGC voltage

To provide most of the receiver gain



A-006-03-05: What is the primary source of noise that can be heard in a VHF/UHF band receiver with its antenna connected?

Receiver front-end noise

Detector noise

Atmospheric noise

Man-made noise



A-006-03-06: What is the term used for the decibel difference (or ratio) between the largest tolerable receiver input signal (without causing audible distortion products) and the minimum discernible signal (sensitivity)?

dynamic range

design parameter

stability

noise figure



A-006-03-07: The lower the receiver noise figure becomes, the greater will be the receiver's _________ :

sensitivity

rejection of unwanted signals

selectivity

stability



A-006-03-08: The noise generated in a receiver of good design originates in the:

RF amplifier and mixer

detector and AF amplifier

BFO and detector

IF amplifier and detector



A-006-03-09: Why are very low noise figures relatively unimportant for a high frequency receiver?

external HF noise, man-made and natural, are higher than the internal noise generated by the receiver

ionospheric distortion of the received signal creates high noise levels

the use of SSB and CW on the HF bands overcomes the noise

regardless of the front end, the succeeding stages when used on HF are very noisy



A-006-03-10: The term which relates specifically to the amplitude levels of multiple signals that can be accommodated during reception is called:

dynamic range

AGC

cross-modulation index

noise figure



A-006-03-11: Normally, front-end selectivity is provided by the resonant networks both before and after the RF stage in a superheterodyne receiver. This whole section of the receiver is often referred to as the:

preselector

preamble

preamplifier

pass-selector





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A-006-02: Oscillators, mixers, tuning
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A-006-04: Detection, audio, automatic gain control
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