Where may SSB phone be used in amateur bands above 50 MHz?
The correct answer is C: In at least some segment of all these bands. SSB (Single Sideband) phone can be used in at least some portion of all amateur bands above 50 MHz, including 6 meters, 2 meters, 1.25 meters, 70 centimeters, and higher bands. According to FCC Part 97.305, SSB phone is permitted on various segments of VHF and UHF bands.
SSB is an efficient voice mode that's popular on HF bands and is also used on VHF and UHF bands, particularly for weak-signal work and long-distance contacts. While FM is more common on VHF/UHF for local communications, SSB provides better performance for DX (long-distance) contacts and weak-signal work. Different bands have different allocations for SSB, but every band above 50 MHz has at least some segment where SSB phone is permitted.
Exam Tip
SSB above 50 MHz = Available on all bands. Remember: SSB phone can be used in at least some segment of every amateur band above 50 MHz. It's not limited to specific license classes or repeaters.
Memory Aid
"**S**SB **A**bove **5**0 = **S**omewhere on **A**ll bands (think 'SA5 = SA' = Somewhere on All)"
Real-World Application
You're operating on 6 meters (50-54 MHz) using SSB on 50.125 MHz. Later, you switch to 2 meters and use SSB on 144.200 MHz for a weak-signal contact. Then you move to 70 centimeters and use SSB on 432.100 MHz. In each case, you're using SSB phone, which is permitted in at least some segment of each of these bands above 50 MHz.
FCC Part 97.305Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. SSB phone is not limited to General class or higher sub-bands. Technician licensees can use SSB on VHF/UHF bands within their privileges.
Option B: Incorrect. SSB phone is not limited to repeaters. SSB is primarily a simplex mode used for direct communication, not through repeaters.
Option D: Incorrect. Power limitations don't restrict which bands SSB can be used on. SSB can be used on multiple bands above 50 MHz regardless of power level (within legal limits).
题目解析
The correct answer is C: In at least some segment of all these bands. SSB (Single Sideband) phone can be used in at least some portion of all amateur bands above 50 MHz, including 6 meters, 2 meters, 1.25 meters, 70 centimeters, and higher bands. According to FCC Part 97.305, SSB phone is permitted on various segments of VHF and UHF bands. SSB is an efficient voice mode that's popular on HF bands and is also used on VHF and UHF bands, particularly for weak-signal work and long-distance contacts. While FM is more common on VHF/UHF for local communications, SSB provides better performance for DX (long-distance) contacts and weak-signal work. Different bands have different allocations for SSB, but every band above 50 MHz has at least some segment where SSB phone is permitted.
考试技巧
SSB above 50 MHz = Available on all bands. Remember: SSB phone can be used in at least some segment of every amateur band above 50 MHz. It's not limited to specific license classes or repeaters.
记忆口诀
**S**SB **A**bove **5**0 = **S**omewhere on **A**ll bands (think 'SA5 = SA' = Somewhere on All)
实际应用示例
You're operating on 6 meters (50-54 MHz) using SSB on 50.125 MHz. Later, you switch to 2 meters and use SSB on 144.200 MHz for a weak-signal contact. Then you move to 70 centimeters and use SSB on 432.100 MHz. In each case, you're using SSB phone, which is permitted in at least some segment of each of these bands above 50 MHz.
错误选项分析
Option A: Incorrect. SSB phone is not limited to General class or higher sub-bands. Technician licensees can use SSB on VHF/UHF bands within their privileges. Option B: Incorrect. SSB phone is not limited to repeaters. SSB is primarily a simplex mode used for direct communication, not through repeaters. Option D: Incorrect. Power limitations don't restrict which bands SSB can be used on. SSB can be used on multiple bands above 50 MHz regardless of power level (within legal limits).
知识点
FCC Part 97.305, SSB phone, VHF/UHF bands, Single sideband
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.