In the block diagram of the receiver shown, the "RF amplifier"
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decreases random fluctuation noise
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is a restoring filter amplifier
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Correct Answerincreases the incoming signal level
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changes the signal frequency
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In the block diagram of the receiver shown, the "mixer"
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Correct Answercombines signals at two different frequencies to produce one at an intermediate frequency
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combines sidebands to produce a stronger signal
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discriminates against SSB and AM signals
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inserts a carrier wave to produce a true FM signal
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In the block diagram of the receiver shown, the output frequency of the "oscillator" is
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the same as that of the incoming received signal
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the same as that of the IF frequency
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Correct Answerdifferent from both the incoming signal and IF frequencies
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at a low audio frequency
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In the block diagram of the receiver shown, the "filter" rejects
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AM and RTTY signals
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Correct Answerunwanted mixer outputs
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noise bursts
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broadcast band signals
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In the block diagram of the receiver shown, the "IF amplifier" is an
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isolation frequency amplifier
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intelligence frequency amplifier
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indeterminate frequency amplifier
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Correct Answerintermediate frequency amplifier
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In the block diagram of the receiver shown, the "product detector"
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produces an 800 Hz beat note
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separates CW and SSB signals
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rejects AM signals
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Correct Answertranslates signals to audio frequencies
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In the block diagram of the receiver shown, the "AF amplifier"
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rejects AM and RTTY signals
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Correct Answeramplifies audio frequency signals
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has a very narrow passband
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restores ambiance to the audio
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In the block diagram of the receiver shown, the "BFO" stands for
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bad frequency obscurer
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basic frequency oscillator
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Correct Answerbeat frequency oscillator
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band filter oscillator
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In the block diagram of the receiver shown, most of the receiver gain is in the
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RF amplifier
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Correct AnswerIF amplifier
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AF amplifier
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mixer
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In the block diagram of the receiver shown, the "RF amplifier"
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decreases random fluctuation noise
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masks strong noise
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Correct Answershould produce little internal noise
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changes the signal frequency
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In the block diagram of the receiver shown, the "mixer"
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Correct Answerchanges the signal frequency
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rejects SSB and CW signals
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protects against receiver overload
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limits the noise on the signal
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In the receiver shown, when receiving a signal, the output frequency of the "oscillator" is
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the same as that of the signal
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the same as that of the IF amplifier
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Correct Answerof constant amplitude and frequency
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passed through the following filter
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In the block diagram of the receiver shown, the "limiter"
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Correct Answerlimits the signal to a constant amplitude
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rejects SSB and CW signals
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limits the frequency shift of the signal
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limits the phase shift of the signal
The demodulator will usually be a "discriminator" and may even be of a "phase-lock-loop" variety. There will be a "limiter" before the descriminator to remove noise peaks and amplitude-changes before detection of the FM signal
Last edited by cmscouler. Register to edit
In the block diagram of the receiver shown, the "frequency demodulator" could be implemented with a
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product detector
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Correct Answerphase-locked loop
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full-wave rectifier
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low-pass filter
The demodulator will usually be a "discriminator" and may even be of a "phase-lock-loop" variety.
Last edited by cmscouler. Register to edit
In the block diagram of the receiver shown, the "AF amplifier"
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amplifies stereo signals
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Correct Answeramplifies speech frequencies
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is an all frequency amplifier
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must be fitted with a tone control
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In this receiver, an audio frequency gain control would be associated with the block labelled
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Correct AnswerAF amplifier
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frequency demodulator
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speaker, phones
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IF amplifier
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In the block diagram of the receiver shown, the selectivity would be set by the
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AF amplifier
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mixer
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limiter
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Correct Answerfilter
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In the FM communications receiver shown in the block diagram, the "filter" bandwidth is typically
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3 kHz
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Correct Answer10 kHz
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64 kHz
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128 kHz
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In the block diagram of the receiver shown, an automatic gain control (AGC) circuit would be associated with the
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Speaker
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Correct AnswerIF amplifier
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RF filter
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Oscillator
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In the block diagram of the receiver shown, the waveform produced by the "oscillator" would ideally be a
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square wave
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pulsed wave
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Correct Answersinewave
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hybrid frequency wave
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