Station Assembly, Practice and Safety
carrier suppression, SSB fundamentals
What may happen if an SSB transmitter is operated with the microphone gain set too high?
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It may cause interference to other stations operating on a higher frequency band
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It may cause atmospheric interference in the air around the antenna
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Correct AnswerIt may cause splatter interference to other stations operating near its frequency
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It may cause digital interference to computer equipment
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What may happen if an SSB transmitter is operated with too much speech processing?
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It may cause digital interference to computer equipment
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It may cause atmospheric interference in the air around the antenna
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It may cause interference to other stations operating on a higher frequency band
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Correct AnswerIt may cause splatter interference to other stations operating near its frequency
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What is the term for the average power supplied to an antenna transmission line during one RF cycle, at the crest of the modulation envelope?
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Peak output power
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Correct AnswerPeak envelope power
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Average radio-frequency power
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Peak transmitter power
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What is the usual bandwidth of a singlesideband amateur signal?
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1 kHz
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2 kHz
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Between 3 and 6 kHz
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Correct AnswerBetween 2 and 3 kHz
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In a typical single-sideband phone transmitter, what circuit processes signals from the balanced modulator and sends signals to the mixer?
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IF amplifier
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Correct AnswerFilter
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RF amplifier
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Carrier oscillator
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What is one advantage of carrier suppression in a double-sideband phone transmission?
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Correct AnswerMore power can be put into the sidebands
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Only half the bandwidth is required for the same information content
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Greater modulation percentage is obtainable with lower distortion
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Simpler equipment can be used to receive a double-sideband suppressedcarrier signal
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What happens to the signal of an overmodulated single-sideband or double-sideband phone transmitter?
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It becomes louder with no other effects
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It occupies less bandwidth with poor high-frequency response
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It has higher fidelity and improved signal-to-noise ratio
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Correct AnswerIt becomes distorted and occupies more bandwidth
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How should the microphone gain control be adjusted on a single-sideband phone transmitter?
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Correct AnswerFor slight movement of the ALC meter on modulation peaks
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For full deflection of the ALC meter on modulation peaks
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For 100% frequency deviation on modulation peaks
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For a dip in plate current
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The purpose of a balanced modulator in an SSB transmitter is to:
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make sure that the carrier and both sidebands are 180o out of phase
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ensure that the percentage of modulation is kept constant
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make sure that the carrier and both sidebands are in phase
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Correct Answersuppress the carrier and pass on the two sidebands
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In a SSB transmission, the carrier is:
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transmitted with one sideband
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Correct Answerreinserted at the receiver
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inserted at the transmitter
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of no use at the receiver
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The automatic level control (ALC) in a SSB transmitter:
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eliminates the transmitter distortion
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Correct Answercontrols the peak audio input so that the final amplifier is not overdriven
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increases the occupied bandwidth
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reduces the system noise
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