Which mode is most commonly used for voice communications on frequencies of 14 MHz or higher?
Upper sideband✓پاسخ درست
Lower sideband
Suppressed sideband
Double sideband
توضیح
Amateur HF voice practice splits at 10 MHz: the bands from 20 meters upward use USB. A station selecting the opposite sideband remains on frequency but will sound unintelligible to operators using the normal convention.