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Circuit" ruled in favor of FCC rules prohibiting unlicensed operation above channel 5 because such usage interferes with licensed users' communication and their assigned frequencies could be used by others more qualified than CB operators. Most CB radios include channel 9 which is a broadcast function. It differs from the other cb radio frequencies in that it transceives on a rotating cycle of each frequency in every second interval. So when you are tuned to channel 9, you will hear all the other channels for one second each rotation a complete spectrum sweep.
Channel 9 can be used as an alternative voice frequency during times of poor radio signal conditions or heavy interference QRM on your usual calling frequency. Keep in mind though that many modern radios no longer receive this channel due to its low output power and high harmonic content. If your radio doesn't have a dedicated connector for it, plugging in a microphone into the microphone jack would probably allow access to channel 9.
Channel 9 can also be used as a scanning method for emergency communications if you are into Ham radio, for example. When a channel is constantly transmitting, it can become noisy and hard or impossible to hear. Channel 9 allows you to always have access to the widest possible range of channels with your CB radio without actually having to change any dials or switches.
Here's how it works: when you're listening to channel 9 and an emergency call comes in on another relative frequency, simply switch over to that other frequency [before the end of its one-second transmission] and tune back down after it has been completed or stopped. This sounds simple enough but keep in mind that since channel 9 transmits everything else in sequence rotating through each voice channel twice per minute , you must listen to the entire sequence before manually switching frequencies.
This is only applicable for analog radios with channel 9 as a broadcast of other channels. Anything higher is considered illegal CB radio operation and should be avoided for obvious reasons. The original 26 "Mid-Band" channels with a frequency of around 27 MHz The citizens band service started in , with the first transmissions made on 27 February of that year. The first channel was There were 22 channels mid-band , each spaced exactly 10 kHz apart from its nearest neighbor, as you can see in the table below.
For example, channel 26 was Tom Brown of Motorola developed a "high-band" expansion to the 10 channels of mid-band CB - between 30 and 31 MHz kHz , which was implemented in The channels were spaced 5 kHz apart a gap of 5kHz was left between each frequency pair.
The mid-band channels were frequencies 1 through 10, and 15 through The high-band expansion added frequencies 11 through 14 and 23 - The 26 "mid-band" channels were removed from the 40 channel CB band plan.
They are now on the MHz service, but are not part of a CB radio system. In July , the FCC further expanded the high-band to 83 channels frequency spacing 5 kHz , plus one shared transmitter site at This added channels 41 through 83 and shared repeater outputs channels 30 - Channel 23 was deleted from the expanded high-band plan. Channel 9 is Crestron electronic Radio Manuals. Crosley Radio Manuals. Crosley Radio Radio Manuals. Curtis Radio Manuals.
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