Amateur Extra › E1 Commission Rules › E1A03
E1A03
What is the highest legal carrier frequency on the 20-meter band for transmitting a 2.8 kHz wide USB data signal?
Pick an answer to check it.
Answer: C. 14.1472 MHz
Data emissions on 20 meters are limited to 14.000 to 14.150 MHz. A USB signal extends above the carrier, so the highest carrier is 14.150 MHz - 2.8 kHz = 14.1472 MHz.
Tip: Top edge minus bandwidth: 14.150 - 0.0028.
FCC rule reference: Part 97.305, 97.307(b)