Author Rick Lewis - Cobra CB Radio Blog
Visit Rick's website at TheCBdoctor.com

In 1957 Congress authorized The Federal Communication Commission to create a citizen band radio service. The FCC or" UNCLE CHARLIE" took the lower portion of the 10 meter recreational band and created a very restrictive class "D" Citizens Band starting at 26.965 MHz, as channel "1" and ending it with channel "23" at 27.255 MHz.

Except for channel 23 each channel was given a 5 kHz bandwidth with a 2.5 kHz bandguard on each end of the Bandwidth for a total of 10Khz between each channel or 10,000 Hz.

The mode of transmission chosen was "Amplitude Modulation" or "AM", with a carrier or "DEAD KEY of 4 Watts and a Peak Envelope Power or PEP of 12 watts. SSB was allowed with a maximum output of 12 watts.

Five "RC" or Remote Control channels were reserved primarily for remotely controlling model cars and toys. These channels were not
allowed to remotely control model aircraft due to the fact that interference of the signals may cause the model aircraft to go out
of control and injure people and damage property. (more...)