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