Amateur hf calling frequencies
International distress frequency - Wikipedia
What's the difference between national calling frequency and national simplex calling frequency in the 2m and 70cm band plans published by ARRL? Simplex in Amateur Radio is one way communication at a time between two communicating stations. When simultaneous transmission is used with capable equipment, it's called full duplex, meaning both
Ham Radio Bands Frequency Guide for the Considerate Operator!
It is important to note that the frequencies shown above in the green area of this chart are suppressed carrier frequencies the frequencies 5405kHz is common to the UK amateur 5MHz experimental band plan. This new allocation presents some new twists in amateur HF operation as well as some unfamiliar technical demands.
Band Plan - American Radio Relay League
calling frequencies HF To 6M DX, DXpedition, SSB, CW, AM, FM, RTTY, SSTV Note: By tradition, 20M and up is Upper Sideband, 40M and below is Lower Sideband.