B-001
Subelement B-001
Section B-001-019
Section B-001-019
What do Canadian regulations stipulate regarding frequency stability in the amateur radio service?
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It shall remain within 2 parts per million, one hour after power up
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Correct AnswerIt must be equivalent to crystal control below 148 MHz
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It must not drift more than 10 Hz from a governmental time signal broadcast service
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It shall remain within 0.05% from -30 to +40 degrees Celsius ambient temperature
"The frequency stability of an amateur station in a frequency band below 148.000 MHz shall be equal to or greater than that which is obtainable using crystal control." (RBR-4)
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
Which of the following emission modes requires that an amateur radio station have means to prevent or indicate overmodulation?
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RTTY
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Correct AnswerSSB
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CW
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FM
Key word: OVERMODULATION. Supposes voice operation. "An amateur station shall be equipped with a means of: (a) determining the transmit frequency to the same degree of accuracy as would a crystal calibrator; and (b) indicating or preventing overmodulation of the transmitter in the case of a radiotelephone transmitter." (RBR-4)
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
Amateur radio stations are required to have means of indicating or preventing a signal quality problem unique to voice transmissions. What is it?
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Inadequate pre-emphasis
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Excessive compression
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Correct AnswerOvermodulation
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Inadequate audio filtering
Key words: VOICE TRANSMISSIONS. Voice operation runs the risk of overmodulation. "An amateur station shall be equipped with a means of: (a) determining the transmit frequency to the same degree of accuracy as would a crystal calibrator; and (b) indicating or preventing overmodulation of the transmitter in the case of a radiotelephone transmitter." (RBR-4)
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
What is the maximum percentage of modulation permitted for amateur radio voice communications?
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50%
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90%
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Correct Answer100%
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75%
What must all amateur radio stations be capable of reliably measuring, regardless of emission mode?
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Correct AnswerFrequency
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Modulation
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SWR
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RF power
Key words: REGARDLESS OF THE MODE. "Determining the frequency" applies to all modes. "Indication or prevention of overmodulation" applies to voice operation. "An amateur station shall be equipped with a means of: (a) determining the transmit frequency to the same degree of accuracy as would a crystal calibrator; and (b) indicating or preventing overmodulation of the transmitter in the case of a radiotelephone transmitter." (RBR-4)
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
What is the maximum percentage of modulation permitted for amateur radio voice communications?
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Correct Answer100%
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50%
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75%
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90%
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