Which of the following could be the reason you are unable to access a repeater whose output you can hear?
The correct answer is D: All these choices are correct. If you can hear a repeater's output but cannot access it, the problem could be improper transceiver offset (your radio isn't transmitting on the correct input frequency), wrong CTCSS tone (the repeater requires a specific tone you're not transmitting), or wrong DCS code (the repeater uses Digital-Coded Squelch instead of or in addition to CTCSS).
All three issues can prevent you from accessing a repeater even though you can hear it clearly. The most common issue is incorrect offset, but CTCSS and DCS problems are also frequent. Modern radios often have these settings stored in memory, but if they're incorrect, you won't be able to access the repeater.
Exam Tip
Can't access repeater = Check offset, CTCSS, DCS. Remember: If you can hear a repeater but can't access it, check your offset frequency, CTCSS tone, and DCS code. Any of these being wrong will prevent access.
Memory Aid
"**C**an't **A**ccess = **C**heck **A**ll **T**hree (think 'CA = CAT' = Check All Three: offset, CTCSS, DCS)"
Real-World Application
You can hear the local repeater clearly on 146.760 MHz, but when you try to transmit, the repeater doesn't respond. You check your radio settings and discover your offset is set to 5 MHz instead of 600 kHz, so you're transmitting on the wrong frequency. After correcting the offset to 600 kHz (transmitting on 146.160 MHz), you can now access the repeater.
FCC Part 97.205Key Concepts
Why Other Options Are Wrong
This question has no incorrect options since all choices are correct. However, it's important to understand that any of these three issues (offset, CTCSS, or DCS) can prevent repeater access.
题目解析
The correct answer is D: All these choices are correct. If you can hear a repeater's output but cannot access it, the problem could be improper transceiver offset (your radio isn't transmitting on the correct input frequency), wrong CTCSS tone (the repeater requires a specific tone you're not transmitting), or wrong DCS code (the repeater uses Digital-Coded Squelch instead of or in addition to CTCSS). All three issues can prevent you from accessing a repeater even though you can hear it clearly. The most common issue is incorrect offset, but CTCSS and DCS problems are also frequent. Modern radios often have these settings stored in memory, but if they're incorrect, you won't be able to access the repeater.
考试技巧
Can't access repeater = Check offset, CTCSS, DCS. Remember: If you can hear a repeater but can't access it, check your offset frequency, CTCSS tone, and DCS code. Any of these being wrong will prevent access.
记忆口诀
**C**an't **A**ccess = **C**heck **A**ll **T**hree (think 'CA = CAT' = Check All Three: offset, CTCSS, DCS)
实际应用示例
You can hear the local repeater clearly on 146.760 MHz, but when you try to transmit, the repeater doesn't respond. You check your radio settings and discover your offset is set to 5 MHz instead of 600 kHz, so you're transmitting on the wrong frequency. After correcting the offset to 600 kHz (transmitting on 146.160 MHz), you can now access the repeater.
错误选项分析
This question has no incorrect options since all choices are correct. However, it's important to understand that any of these three issues (offset, CTCSS, or DCS) can prevent repeater access.
知识点
Repeater access, Frequency offset, CTCSS, DCS
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.