86 lines
3.4 KiB
Markdown
86 lines
3.4 KiB
Markdown
T4B - Operating controls: frequency tuning, use of filters, squelch function, AGC, memory channels, noise blanker, microphone gain, receiver incremental tuning (RIT), bandwidth selection, digital transceiver configuration
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- [[T4B01]] (B)
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What is the effect of excessive microphone gain on SSB transmissions? #card
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- A. Frequency instability
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- B. Distorted transmitted audio
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- C. Increased SWR
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- D. All these choices are correct
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- [[T4B02]] (A)
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Which of the following can be used to enter a transceiver’s operating frequency? #card
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- A. The keypad or VFO knob
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- B. The CTCSS or DTMF encoder
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- C. The Automatic Frequency Control
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- D. All these choices are correct
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- [[T4B03]] (A)
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How is squelch adjusted so that a weak FM signal can be heard? #card
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- A. Set the squelch threshold so that receiver output audio is on all the time
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- B. Turn up the audio level until it overcomes the squelch threshold
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- C. Turn on the anti-squelch function
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- D. Enable squelch enhancement
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- [[T4B04]] (B)
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What is a way to enable quick access to a favorite frequency or channel on your transceiver? #card
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- A. Enable the frequency offset
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- B. Store it in a memory channel
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- C. Enable the VOX
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- D. Use the scan mode to select the desired frequency
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- [[T4B05]] (C)
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What does the scanning function of an FM transceiver do? #card
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- A. Checks incoming signal deviation
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- B. Prevents interference to nearby repeaters
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- C. Tunes through a range of frequencies to check for activity
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- D. Checks for messages left on a digital bulletin board
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- [[T4B06]] (D)
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Which of the following controls could be used if the voice pitch of a single-sideband signal returning to your CQ call seems too high or low? #card
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- A. The AGC or limiter
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- B. The bandwidth selection
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- C. The tone squelch
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- D. The RIT or Clarifier
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- [[T4B07]] (B)
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What does a DMR “code plug” contain? #card
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- A. Your call sign in CW for automatic identification
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- B. Access information for repeaters and talkgroups
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- C. The codec for digitizing audio
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- D. The DMR software version
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- [[T4B08]] (B)
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What is the advantage of having multiple receive bandwidth choices on a multimode transceiver? #card
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- A. Permits monitoring several modes at once by selecting a separate filter for each mode
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- B. Permits noise or interference reduction by selecting a bandwidth matching the mode
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- C. Increases the number of frequencies that can be stored in memory
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- D. Increases the amount of offset between receive and transmit frequencies
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- [[T4B09]] (C)
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How is a specific group of stations selected on a digital voice transceiver? #card
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- A. By retrieving the frequencies from transceiver memory
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- B. By enabling the group’s CTCSS tone
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- C. By entering the group’s identification code
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- D. By activating automatic identification
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- [[T4B10]] (C)
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Which of the following receiver filter bandwidths provides the best signal-to-noise ratio for SSB reception? #card
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- A. 500 Hz
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- B. 1000 Hz
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- C. 2400 Hz
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- D. 5000 Hz
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- [[T4B11]] (A)
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Which of the following must be programmed into a D-STAR digital transceiver before transmitting? #card
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- A. Your call sign
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- B. Your output power
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- C. The codec type being used
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- D. All these choices are correct
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- [[T4B12]] (D)
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What is the result of tuning an FM receiver above or below a signal’s frequency? #card
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- A. Change in audio pitch
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- B. Sideband inversion
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- C. Generation of a heterodyne tone
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- D. Distortion of the signal’s audio
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