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T2B01
What is the purpose of the reverse function on a VHF/UHF transceiver?
- A. To reduce power output
- B. To increase power output
- C. To listen on a repeater’s input frequency ✓ Correct answer
- D. To listen on a repeater’s output frequency
The reverse function swaps your transmit and receive frequencies, so you listen on the repeater's input frequency. That lets you check whether you can hear the other station directly, which would mean you could talk simplex. It does not change power.
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T2B02
What term describes the use of a sub-audible tone transmitted along with normal voice audio to open the squelch of a receiver?
- A. Carrier squelch
- B. Tone burst
- C. DTMF
- D. CTCSS ✓ Correct answer
CTCSS (Continuous Tone-Coded Squelch System) sends a sub-audible tone along with your voice, and the repeater opens its squelch only when it hears the correct tone. Tone burst is a short audible tone, and DTMF uses touch-tone pairs.
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T2B03
Which of the following describes a linked repeater network?
- A. A network of repeaters in which signals received by one repeater are transmitted by all the repeaters in the network ✓ Correct answer
- B. A single repeater with more than one receiver
- C. Multiple repeaters with the same control operator
- D. A system of repeaters linked by APRS
In a linked repeater network, what one repeater receives is retransmitted by all the repeaters in the network, extending coverage over a wide area. It is not one repeater with several receivers or a matter of shared control operators.
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T2B04
Which of the following could be the reason you are unable to access a repeater whose output you can hear?
- A. Improper transceiver offset
- B. You are using the wrong CTCSS tone
- C. You are using the wrong DCS code
- D. All these choices are correct ✓ Correct answer
Any of these can lock you out. A wrong offset puts your transmitter on the wrong input frequency, and a wrong CTCSS tone or DCS code means the repeater's access control ignores you. Hearing the output alone does not prove your transmit settings are right.
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T2B05
Which of the following would cause your FM transmission audio to drop out on voice peaks?
- A. Your repeater offset is inverted
- B. Your FM deviation is too low
- C. You are talking too loudly ✓ Correct answer
- D. Your transmit power is too high
Talking too loudly overdeviates your FM signal, so on voice peaks it swings wider than the receiver's filter passband and the audio distorts or drops out. Low deviation would make your audio weak rather than dropping out, and an inverted offset would stop access entirely.
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T2B06
What type of signaling to a repeater uses two simultaneous audio tones?
- A. DTMF ✓ Correct answer
- B. CTCSS
- C. GMRS
- D. D-STAR
DTMF (dual-tone multi-frequency, or touch tone) sends two simultaneous audio tones for each key pressed. CTCSS uses a single continuous sub-audible tone. GMRS is a radio service and D-STAR is a digital voice system.
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T2B07
How can you join a digital repeater’s “talkgroup”?
- A. Register with the local Frequency Coordinator
- B. Register with the digital repeater control operator
- C. Program your radio with the group’s ID or code ✓ Correct answer
- D. Program your radio with the DTMF tone used by the talkgroup
Digital voice systems like DMR organize traffic by talkgroup ID, and you join one by programming your radio with that group's ID or code. No registration with a coordinator or control operator is needed, and DTMF is not how talkgroups are selected.
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T2B08
Which of the following applies when two stations transmitting on the same frequency interfere with each other?
- A. The stations should negotiate continued use of the frequency ✓ Correct answer
- B. Both stations should choose another frequency to avoid conflict
- C. Whichever station was on the frequency first has preemptive rights to the frequency
- D. Use subaudible tones so both stations can share the frequency
No one owns a frequency, and being there first gives no preemptive right. When two stations interfere with each other, courtesy calls for them to talk it over and agree on who continues or who moves. Sub-audible tones do not let two signals share a frequency.
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T2B09
Why are simplex channels designated in the VHF/UHF band plans?
- A. So stations within range of each other can communicate without tying up a repeater ✓ Correct answer
- B. For contest operation
- C. For working DX only
- D. So stations with simple transmitters can access the repeater without automated offset
Simplex channels are set aside so stations within range of each other can talk directly without occupying a repeater, keeping repeaters free for those who need them to cover greater distances. They are not specifically for contests or DX.
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T2B10
Which Q signal indicates that you are receiving interference from other stations?
- A. QRM ✓ Correct answer
- B. QRN
- C. QTH
- D. QSB
QRM means you are receiving interference from other stations. QRN is natural noise such as static, QTH is your location, and QSB is fading signal strength. Think of the M as man-made interference.
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T2B11
Which Q signal indicates that you are changing frequency?
- A. QRU
- B. QSY ✓ Correct answer
- C. QSL
- D. QRZ
QSY means you are changing frequency, as in "let's QSY to 146.52." QRU asks whether there is anything more for you, QSL acknowledges receipt, and QRZ asks who is calling.
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T2B12
What is the digital color code used on DMR repeater systems?
- A. An access code which must be programmed into a DMR transmitter to access a specific repeater ✓ Correct answer
- B. A code which automatically programs the repeater offset to a frequency chosen by the user
- C. A code which identifies the specific CODEC being used so that the repeater can properly decode the audio
- D. A code transmitted by the repeater to indicate health and status of the equipment
A DMR color code is an access code that must be programmed into your radio so a specific repeater will accept your transmission, much like CTCSS on analog. It does not set offsets, identify a codec, or report equipment status.
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T2B13
What is the purpose of a squelch function?
- A. Reduce a CW transmitter's key clicks
- B. Mute the receiver audio when a signal is not present ✓ Correct answer
- C. Eliminate parasitic oscillations in an RF amplifier
- D. Reduce interference from impulse noise
Squelch mutes the receiver audio when no signal is present, so you do not listen to constant hiss between transmissions. You adjust it to just above the noise threshold. It does not affect key clicks, parasitics, or impulse noise.
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T2B14
Which of the following is a “talkgroup”?
- A. A group of amateur radio operators who share email on a specific amateur radio topic
- B. An identifier used by DMR to organize radio traffic so that those who want to hear the group aren’t bothered by other radio traffic ✓ Correct answer
- C. The members of a net organized for amateur radio operators with a specific common interest
- D. A method of automatically alerting all group members to the frequency where any member is transmitting
In DMR, a talkgroup is an identifier that organizes radio traffic so users hear only the conversations they want and are not bothered by other traffic. It is not an email group, a net membership, or an alerting method.