What is a common repeater frequency offset in the 2 meter band?
The correct answer is B: Plus or minus 600 kHz. According to standard 2-meter band plans, the common repeater frequency offset is 600 kHz (0.6 MHz). This means repeaters typically receive on one frequency and transmit on a frequency that's 600 kHz higher or lower.
For example, a repeater might receive on 146.160 MHz and transmit on 146.760 MHz (600 kHz higher, or +600 kHz). Or it might receive on 146.760 MHz and transmit on 146.160 MHz (600 kHz lower, or -600 kHz). This 600 kHz offset is standard for 2-meter repeaters in the United States and helps prevent interference between repeater input and output frequencies.
Exam Tip
2-meter offset = 600 kHz. Remember: The standard 2-meter repeater offset is 600 kHz (0.6 MHz). This is a key number to memorize for Technician exam.
Memory Aid
"**2**-meter **O**ffset = **6**00 kHz (think '2O = 6' = 2-meter Offset = 600 kHz)"
Real-World Application
You're programming your 2-meter radio to use a local repeater. The repeater output is 146.760 MHz, so you set your radio to transmit on 146.160 MHz (600 kHz lower, the input frequency) and receive on 146.760 MHz (the output). This 600 kHz offset is standard for 2-meter repeaters.
FCC Part 97.205Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. 5 MHz is too large for 2-meter offsets. The 2-meter band is only 4 MHz wide (144-148 MHz), so a 5 MHz offset wouldn't fit.
Option C: Incorrect. 500 kHz is close but not the standard. The standard 2-meter offset is 600 kHz.
Option D: Incorrect. 1 MHz is not the standard 2-meter offset. The standard is 600 kHz.
题目解析
The correct answer is B: Plus or minus 600 kHz. According to standard 2-meter band plans, the common repeater frequency offset is 600 kHz (0.6 MHz). This means repeaters typically receive on one frequency and transmit on a frequency that's 600 kHz higher or lower. For example, a repeater might receive on 146.160 MHz and transmit on 146.760 MHz (600 kHz higher, or +600 kHz). Or it might receive on 146.760 MHz and transmit on 146.160 MHz (600 kHz lower, or -600 kHz). This 600 kHz offset is standard for 2-meter repeaters in the United States and helps prevent interference between repeater input and output frequencies.
考试技巧
2-meter offset = 600 kHz. Remember: The standard 2-meter repeater offset is 600 kHz (0.6 MHz). This is a key number to memorize for Technician exam.
记忆口诀
**2**-meter **O**ffset = **6**00 kHz (think '2O = 6' = 2-meter Offset = 600 kHz)
实际应用示例
You're programming your 2-meter radio to use a local repeater. The repeater output is 146.760 MHz, so you set your radio to transmit on 146.160 MHz (600 kHz lower, the input frequency) and receive on 146.760 MHz (the output). This 600 kHz offset is standard for 2-meter repeaters.
错误选项分析
Option A: Incorrect. 5 MHz is too large for 2-meter offsets. The 2-meter band is only 4 MHz wide (144-148 MHz), so a 5 MHz offset wouldn't fit. Option C: Incorrect. 500 kHz is close but not the standard. The standard 2-meter offset is 600 kHz. Option D: Incorrect. 1 MHz is not the standard 2-meter offset. The standard is 600 kHz.
知识点
2-meter band, Repeater offset, 600 kHz, Frequency separation
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.