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T2B14

OPERATING PROCEDURES · VHF/UHF operating practices: FM repeater, simplex, reverse splits; Access tones: CTCSS, DTMF; DMR operation; Resolving operating problems; Q signals

T2B14T2B →

Which of the following is a "talkgroup"?

  1. AA group of amateur radio operators who share email on a specific amateur radio topic
  2. BAn identifier used by DMR to organize radio traffic so that those who want to hear the group aren't bothered by other radio traffic
  3. CThe members of a net organized for amateur radio operators with a specific common interest
  4. DA method of automatically alerting all group members to the frequency where any member is transmitting
Why In DMR (Digital Mobile Radio), every transmission carries a numeric talkgroup ID along with the user's radio ID. Your radio is programmed to unmute only for the talkgroup IDs you have selected, so traffic aimed at other talkgroups passes by silently even though it shares the same repeater and time slot. It works like a digital version of a CTCSS tone, but it identifies a subject or regional network rather than just a repeater.
Watch out The choices about a net with a common interest or an email group describe people gathered around a topic; a DMR talkgroup is the numeric identifier in the data stream that routes and filters the audio, not the humans themselves.
Talkgroup = a number in the DMR data stream, the digital cousin of a CTCSS tone.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
← T2B13 All of T2B

The rest of T2B

  1. T2B01 What is the purpose of the reverse function on a VHF/UHF transceiver?
  2. T2B02 What term describes the use of a sub-audible tone transmitted along with normal voice audio to open the squel…
  3. T2B03 Which of the following describes a linked repeater network?
  4. T2B04 Which of the following could be the reason you are unable to access a repeater whose output you can hear?
  5. T2B05 Which of the following would cause your FM transmission audio to drop out on voice peaks?
  6. T2B06 What type of signaling to a repeater uses two simultaneous audio tones?
  7. T2B07 How can you join a digital repeater's "talkgroup"?
  8. T2B08 Which of the following applies when two stations transmitting on the same frequency interfere with each other?
  9. T2B09 Why are simplex channels designated in the VHF/UHF band plans?
  10. T2B10 Which Q signal indicates that you are receiving interference from other stations?
  11. T2B11 Which Q signal indicates that you are changing frequency?
  12. T2B12 What is the digital color code used on DMR repeater systems?
  13. T2B13 What is the purpose of a squelch function?
  14. T2B14 Which of the following is a "talkgroup"?
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