FM
From HFUnderground
Frequency Modulation
With FM, the carrier frequency is modulated by the audio signal, with the transmitter power remaining constant. FM typically produces better quality signals than AM when the received signal is strong, but worse quality under poor reception conditions.
It is rarely used on HF frequencies, with the exception of 27 MHz CB operators in many countries - often in conjunction with AM and SSB, amateur radio operators using the FM in the 10 meter band, land mobile radio users operating on a small number of channelized frequencies in the 25 to 30 MHz range and some specialized maritime mobile (marine radio) systems used by fishing fleets, fishery radio networks, etc.
FM (in the form of narrow FM, also known as NFM or NBFM for narrow band FM) is heavily used on the VHF/UHF bands. Different services have different regulations regarding deviation limits, bandwidth, etc. for FM voice use worldwide.
FM mode is also known by its emission designation F3 or F3E.
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