The term "
freeband" pretty much refers to the 25.1000
MHz (25100.0 kHz) to 28.0000 MHz (28000.0 kHz) band, although people do operate "freeband" above those ranges, and into the 10-meter
ham radio band (which is REALLY illegal).
Freeband comes from the 26.9650 to 27.
4050 MHz CB radio band. Because of heavy use of this band al around the world (in all modes, AM,
SSB, FM). People started to modify thier CB radios to operate above or below (usally above, in the 27.4150 to 28.
775 MHz range) the normal CB band. Really, this band has very little users, the military and government have a few channels, and 28.000 to 29.700 is ham radio, and there are a few channels allocated to the Forest Products Radio Service/Business Radio Pool.
The most common
modulation mode is SSB.
The international calling frequency is 27.555 MHz (27555.0 kHz)
