RTTY frequencies

The 70-centimeter or 440 MHz band is a portion of the UHF radio spectrum internationally allocated to amateur radio and amateur satellite use. The ITU amateur radio allocation is from 430 to 440 MHz; however, some countries, such as the United States, allocate hams 420 to 450 MHz.

Many repeaters (2m, 70cm) you do not have to call CQ. You can just say “<your FCC callsign> <mobile, portable (as needed)> listening!”

In the UK the 2m calling frequency is 145.500 MHz FM .

The conventional wisdom in amateur radio is that we should not call CQ when using FM on the VHF and UHF bands, especially on repeaters. The reasoning for this is that during normal VHF/UHF FM operating, radio amateurs are tuned to a specific frequency and will easily hear a call on FM.