Deep Dive: G2A02
The correct answer is B: Lower sideband. Lower sideband (LSB) is most commonly used for voice communications on the 160-, 75-, and 40-meter bands. These bands are below 10 MHz, where LSB is the standard convention. For amateur radio operators, understanding this convention ensures compatibility - everyone uses LSB on these bands. This is an important operating convention that allows proper communication.
Why Other Answers Are Wrong
Option A (Upper sideband): Incorrect. USB is used on frequencies above 10 MHz (20m, 15m, 12m, 10m), not on 160m, 75m, and 40m. LSB is standard below 10 MHz. Option C (Suppressed sideband): Incorrect. This describes the technique, not which sideband is used. Both USB and LSB are suppressed sideband modes. Option D (Double sideband): Incorrect. DSB transmits both sidebands, which is inefficient. SSB (single sideband) is standard, and LSB is used on 160m, 75m, and 40m.
Exam Tip
160m, 75m, 40m = Lower sideband. Think 'L'ower 'S'ideband for 'L'ower frequencies (below 10 MHz). LSB is standard for 160m, 75m, and 40m. USB is for higher frequencies (14 MHz and above).
Memory Aid
160m, 75m, 40m = Lower sideband. Think 'L'ower 'S'ideband for 'L'ower frequencies. LSB convention: 160m, 75m, 40m use LSB. USB is for 20m, 15m, 12m, 10m, VHF/UHF (14 MHz and above).
Real-World Example
You operate SSB on 40 meters (7 MHz). Everyone uses lower sideband on this band - it's the standard convention. If you transmitted upper sideband, your signal would be on the wrong side of the carrier, and other operators wouldn't be able to copy you properly. LSB ensures compatibility on these lower frequency bands.
Source & Coverage
Question Pool: 2023-2027 Question Pool
Subelement: G2A
Reference: 2023-2027 Question Pool · G2 - Operating Procedures
Key Concepts
Verified Content
Question from the official FCC General Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the G2A topic.