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315 lines
6.1 KiB
Plaintext
315 lines
6.1 KiB
Plaintext
% FILENAME = N25.TXT
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% Receiver Block Diagrams
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% Release version 3, October 2001
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% Q 15 and 19 changed 6 Mar 2012
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%Question: 1
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#16.1 In the block diagram of the receiver shown, the "RF amplifier":
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<img src = "ssbrx.gif" align = center width = 600 height = 161>
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<totallines = 15>
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decreases random fluctuation noise
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is a restoring filter amplifier
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increases the incoming signal level
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changes the signal frequency
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% ans 3
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%Question: 2
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#16.2 In the block diagram of the receiver shown, the "mixer":
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<img src = "ssbrx.gif" align = center width = 600 height = 161>
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<totallines = 15>
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combines 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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% ans 1
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%Question: 3
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#16.3 In the block diagram of the receiver shown, the output frequency of the
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"oscillator" is:
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<img src = "ssbrx.gif" align = center width = 600 height = 161>
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<totallines = 15>
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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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different from both the incoming signal and IF frequencies
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at a low audio frequency
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% ans 3
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%Question: 4
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#16.4 In the block diagram of the receiver shown, the "filter" rejects:
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<img src = "ssbrx.gif" align = center width = 600 height = 161>
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<totallines = 15>
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AM and RTTY signals
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unwanted mixer outputs
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noise bursts
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broadcast band signals
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% ans 2
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%Question: 5
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#16.5 In the block diagram of the receiver shown, the "IF amplifier" is an:
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<img src = "ssbrx.gif" align = center width = 600 height = 161>
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<totallines = 15 >
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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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intermediate frequency amplifier
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% ans 4
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%Question: 6
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#16.6 In the block diagram of the receiver shown, the "product detector":
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<img src = "ssbrx.gif" align = center width = 600 height = 161>
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<totallines = 15>
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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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translates signals to audio frequencies
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% ans 4
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%Question: 7
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#16.7 In the block diagram of the receiver shown, the "AF amplifier":
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<img src = "ssbrx.gif" align = center width = 600 height = 161>
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<totallines = 15>
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rejects AM and RTTY signals
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amplifies 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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% ans 2
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%Question: 8
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#16.8 In the block diagram of the receiver shown, the "BFO" stands for:
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<img src = "ssbrx.gif" align = center width = 600 height = 161>
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<totallines = 15>
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bad frequency obscurer
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basic frequency oscillator
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beat frequency oscillator
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band filter oscillator
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% ans 3
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%Question: 9
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#16.9 In the block diagram of the receiver shown, most of the receiver gain is in the:
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<img src = "ssbrx.gif" align = center width = 600 height = 161>
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<totallines = 15>
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RF amplifier
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IF amplifier
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AF amplifier
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mixer
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% ans 2
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%Question: 10
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#16.10 In the block diagram of the receiver shown, the "RF amplifier":
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<img src = "fmrx.gif" align = center width = 600 height = 151>
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<totallines = 16>
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decreases random fluctuation noise
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masks strong noise
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should produce little internal noise
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changes the signal frequency
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% ans 3
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%Question: 11
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#16.11 In the block diagram of the receiver shown, the "mixer":
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<img src = "fmrx.gif" align = center width = 600 height = 151>
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<totallines = 16>
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changes 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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% ans 1
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%Question: 12
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#16.12 In the receiver shown, when receiving a signal, the output frequency of the "oscillator" is:
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<img src = "fmrx.gif" align = center width = 600 height = 151>
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<totallines = 16 >
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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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of constant amplitude and frequency
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passed through the following filter
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% ans 3
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%Question: 13
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#16.13 In the block diagram of the receiver shown, the "limiter":
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<img src = "fmrx.gif" align = center width = 600 height = 151>
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<totallines = 16>
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limits 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
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% ans 1
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%Question: 14
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#16.14 In the block diagram of the receiver shown, the "frequency demodulator"
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could be implemented with a:
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<img src = "fmrx.gif" align = center width = 600 height = 151>
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<totallines = 16>
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product detector
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phase-locked loop
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full-wave rectifier
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low-pass filter
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% ans 2
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%Question: 15
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#16.15 In the block diagram of the receiver shown, the "AF amplifier":
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<img src = "fmrx.gif" align = center width = 600 height = 151>
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<totallines = 16>
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amplifies stereo signals
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amplifies 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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% ans 2
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%Question: 16
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#16.16 In this receiver, an audio frequency gain control
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would be associated with the block labelled:
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<img src = "fmrx.gif" align = center width = 600 height = 151>
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<totallines = 16>
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AF amplifier
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frequency demodulator
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speaker, phones
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IF amplifier
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% ans 1
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%Question: 17
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#16.17 In the block diagram of the receiver shown, the selectivity would be set by the:
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<img src = "fmrx.gif" align = center width = 600 height = 151>
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<totallines = 16>
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AF amplifier
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mixer
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limiter
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filter
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% ans 4
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%Question: 18
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#16.18 In the FM communications receiver shown in the block diagram, the "filter"
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bandwidth is typically:
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<img src = "fmrx.gif" align = center width = 600 height = 151>
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<totallines = 16>
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3 kHz
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10 kHz
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64 kHz
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128 kHz
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% ans 2
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%Question: 19
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#16.19 In the block diagram of the receiver shown, an automatic gain
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control (AGC) circuit would be associated with the:
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<img src = "fmrx.gif" align = center width = 600 height = 151>
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<totallines = 16>
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Speaker
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IF amplifier
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RF filter
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Oscillator
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% ans 2
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%Question: 20
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#16.20 In the block diagram of the receiver shown, the waveform produced by the
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"oscillator" would ideally be a:
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<img src = "fmrx.gif" align = center width = 600 height = 151>
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<totallines = 16>
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square wave
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pulsed wave
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sinewave
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hybrid frequency wave
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% ans 3
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