Transmitters, Modulation and Processing
AM, single sideband, linearity, two-tone test
What type of signal does a balanced modulator produce?
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FM with balanced deviation
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Correct AnswerDouble sideband, suppressed carrier
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Full carrier
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Single sideband, suppressed carrier
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How can a single-sideband phone signal be produced?
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By driving a product detector with a DSB signal
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By using a loop modulator followed by a mixer
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Correct AnswerBy using a balanced modulator followed by a filter
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By using a reactance modulator followed by a mixer
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Carrier suppression in a single-sideband transmitter takes place in:
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the carrier decouple stage
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Correct Answerthe balanced modulator stage
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the mechanical filter
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the frequency multiplier stage
Tags: none
Transmission with SSB, as compared to conventional AM transmission, results in:
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6 dB gain in the receiver
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Correct Answer6 dB gain in the transmitter and 3 dB gain in the receiver
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a greater bandpass requirement in the receiver
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3 db gain in the transmitter
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The peak power output of a singlesideband transmitter, when being tested by a two-tone generator is:
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equal to the RF peak output power of any of the tones
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one-half of the RF peak output power of any of the tones
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Correct Answertwice the RF power output of any of the tones
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one-quarter of the RF peak output power of any of the tones
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What kind of input signal is used to test the amplitude linearity of a singlesideband phone transmitter while viewing the output on an oscilloscope?
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An audio-frequency sine wave
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Correct AnswerTwo audio-frequency sine waves
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An audio-frequency square wave
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Normal speech
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When testing the amplitude linearity of a single-sideband microphone input and on what audio tones are fed into the transmitter, what kind of kind of instrument is the output observed?
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Correct AnswerTwo non-harmonically related tones are fed in, and the output is observed on an oscilloscope
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Two harmonically related tones are fed in, and the output is observed on an oscilloscope
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Two harmonically related tones are fed in, and the output is observed on a distortion analyzer
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Two non-harmonically related tones are fed in, and the output is observed on a distortion analyzer
Tags: none
What audio frequencies are used in a two-tone test of the linearity of a singlesideband phone transmitter?
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20 Hz and 20 kHz tones must be used
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1200 Hz and 2400 Hz tones must be used
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Any two audio tones may be used, but they must be within the transmitter audio passband, and must be harmonically related
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Correct AnswerAny two audio tones may be used, but they must be within the transmitter audio passband, and should not be harmonically related
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What measurement can be made of a single-sideband phone transmitter's amplifier by performing a two-tone test using an oscilloscope?
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Its frequency deviation
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Its percent of carrier phase shift
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Correct AnswerIts linearity
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Its percent of frequency modulation
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How much is the carrier suppressed below peak output power in a singlesideband phone transmission?
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Correct AnswerAt least 40 dB
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No more than 20 dB
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No more than 30 dB
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At least 60 dB
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What is meant by flattopping in a singlesideband phone transmission?
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Correct AnswerSignal distortion caused by excessive drive
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Signal distortion caused by insufficient collector current
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The transmitter's automatic level control is properly adjusted
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The transmitter's carrier is properly suppressed
Tags: none
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