Changes

Originally, channel 10 was the "trucker's channel" (one of the 7 legal channels that could be used to talk to other people that were not affiliated with your license) - however, this caused a lot of interference with channel 9, the emergency channel, and truckers & others were encouraged to find another channel; so today channel 19 is the most popular channel among truck drivers, but there are exceptions in some geographic locations and highways (for example, channel 17 on Interstate 5 on the U.S. West Coast).

Originally, channel 10 was the "trucker's channel" (one of the 7 legal channels that could be used to talk to other people that were not affiliated with your license) - however, this caused a lot of interference with channel 9, the emergency channel, and truckers & others were encouraged to find another channel; so today channel 19 is the most popular channel among truck drivers, but there are exceptions in some geographic locations and highways (for example, channel 17 on Interstate 5 on the U.S. West Coast).

As previously stated, of the original 23 channels, 7 were legally used to communicate with inter-licensee's; channels 10, 11, 12, 13, 14, 15 & 23 (and channel 9 for emergency communications). (This all changed with the advent of the 40 channel system - after which only one frequency (ch 9) was assigned by the FCC for special use.) The remaining channels could only be used by intra-licensee communications. Channel 23 was used on a shared basis with class C paging systems, (and the paging system could have a maximum output of about 20 Watts (25 W input) - while the normal CB channels had a maximum output of 4 Watts (5 W input){up from the 3.5 W output of the 60's}. This explains why several CB radios of the day could be legally modified for class C service to put out 20+ watts by strapping a resistor - most notably were Johnson & Tram CB's that had the resistor in their plate circuit. BTW, channel 16 was the informal SSB only channel.  

As previously stated, of the original 23 channels, 7 were legally used to communicate with inter-licensee's; channels 10, 11, 12, 13, 14, 15 & 23 (and channel 9 for emergency communications). (This all changed with the advent of the 40 channel system - after which only one frequency (ch 9) was assigned by the FCC for special use.) The remaining channels could only be used by intra-licensee communications. Channel 23 was used on a shared basis with class C paging systems, (and the paging system could have a maximum output of about 20 Watts (25 W input) - while the normal CB channels had a maximum output of 4 Watts (5 W input){up from the 3.5 W output of the 60's}. This explains why several CB radios of the day could be legally modified for class C service to put out 20+ watts by strapping a resistor - most notably were Johnson & Tram CB's that had the resistor in their plate circuit. Channel 16 was the informal SSB only channel.

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