CB Radio FM Channels
The USA and Canada permitted FM frequency modulation, optionally with CTCSS and DCS, on 27 MHz CB radio in September 2021. This allows FM operation on the same 40 channels as AM CB radio at 4 watts maximum transmit power. Observations by USA users including the author is that FM is heard mostly in the range of CB radio channels 23 to 31. Any CB radio channel can be used with FM mode, the same as AM or SSB modes. A rise in FM activity over time is also expected on the President P channels that are preprogrammed FM standard CB radio channels with CTCSS / DCS squelch.