How is a VHF/UHF transceiver’s “reverse” function used?
The correct answer is C: To listen on a repeater's input frequency. The reverse function on a VHF/UHF transceiver swaps the transmit and receive frequencies, allowing you to listen on the repeater's input frequency (where other stations transmit to the repeater) instead of the output frequency (where the repeater transmits).
This is useful for several reasons: you can hear stations that might be too weak to open the repeater, you can check if your signal is reaching the repeater, and you can monitor activity on the input frequency. The reverse function essentially flips your radio's offset, so if you're normally listening on the output and transmitting on the input, reverse makes you listen on the input and transmit on the output.
Exam Tip
Reverse = Listen on input. Remember: The reverse function swaps frequencies so you can listen on the repeater's input frequency (where others transmit) instead of the output.
Memory Aid
"**R**everse = **R**eceive **I**nput (think 'R = RI' = Receive Input)"
Real-World Application
You're trying to contact a station through a repeater but can't hear them on the output. You press the reverse button, which swaps your frequencies. Now you're listening on 146.160 MHz (the input) instead of 146.760 MHz (the output). You can hear the other station transmitting directly to the repeater, even though their signal isn't strong enough to open the repeater and come through on the output.
FCC Part 97.205Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. The reverse function doesn't reduce power output. It swaps frequencies, not power levels.
Option B: Incorrect. The reverse function doesn't increase power output. It's about frequency, not power.
Option D: Incorrect. The reverse function doesn't make you listen on the repeater's output frequency - that's what you normally do. Reverse makes you listen on the input.
题目解析
The correct answer is C: To listen on a repeater's input frequency. The reverse function on a VHF/UHF transceiver swaps the transmit and receive frequencies, allowing you to listen on the repeater's input frequency (where other stations transmit to the repeater) instead of the output frequency (where the repeater transmits). This is useful for several reasons: you can hear stations that might be too weak to open the repeater, you can check if your signal is reaching the repeater, and you can monitor activity on the input frequency. The reverse function essentially flips your radio's offset, so if you're normally listening on the output and transmitting on the input, reverse makes you listen on the input and transmit on the output.
考试技巧
Reverse = Listen on input. Remember: The reverse function swaps frequencies so you can listen on the repeater's input frequency (where others transmit) instead of the output.
记忆口诀
**R**everse = **R**eceive **I**nput (think 'R = RI' = Receive Input)
实际应用示例
You're trying to contact a station through a repeater but can't hear them on the output. You press the reverse button, which swaps your frequencies. Now you're listening on 146.160 MHz (the input) instead of 146.760 MHz (the output). You can hear the other station transmitting directly to the repeater, even though their signal isn't strong enough to open the repeater and come through on the output.
错误选项分析
Option A: Incorrect. The reverse function doesn't reduce power output. It swaps frequencies, not power levels. Option B: Incorrect. The reverse function doesn't increase power output. It's about frequency, not power. Option D: Incorrect. The reverse function doesn't make you listen on the repeater's output frequency - that's what you normally do. Reverse makes you listen on the input.
知识点
Reverse function, Repeater input, Repeater output, Frequency monitoring
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.