Somehow [hvde] wound up with a CB radio that does AM and SSB on ... this frequency because it is easier to create an SSB signal at a fixed frequency. The Arduino drives a frequency synthesizer ...

(A typical CB radio uses two "sideband" signals to carry a voice; SSB only uses one.) GMRS also uses Frequency Modulation (FM) as compared to CB radio, which uses Amplitude Modulation (AM).

Amateur radio is the only hobby that offers its licensed operators the chance to legally design, build, and operate high power radio transceivers connected to unlimited antenna arrays for the ...