Why are CB channels not all in order?

[James86004]

I just programmed the CB frequencies into my HT so I could monitor them. I have looked at a few different charts of the frequencies of CB channels, and they all show the frequency of each successive channel higher than the previous, until you get to Channel 23. It is higher than Channels 24 and 25. Does anyone know why?

1 26.965 MHz
2 26.975 MHz
3 26.985 MHz
4 27.005 MHz
5 27.015 MHz
6 27.025 MHz Superbowl of CB Radio
7 27.035 MHz
8 27.055 MHz
9 27.065 MHz
10 27.075 MHz
11 27.085 MHz
12 27.105 MHz
13 27.115 MHz
14 27.125 MHz
15 27.135 MHz
16 27.155 MHz
17 27.165 MHz
18 27.175 MHz
19 27.185 MHz Truckers Channel
20 27.205 MHz
21 27.215 MHz
22 27.225 MHz
23 27.255 MHz
24 27.235 MHz
25 27.245 MHz
26 27.265 MHz
27 27.275 MHz
28 27.285 MHz
29 27.295 MHz
30 27.305 MHz
31 27.315 MHz
32 27.325 MHz
33 27.335 MHz
34 27.345 MHz
35 27.355 MHz
36 27.365 MHz LSB ONLY
37 27.375 MHz LSB ONLY
38 27.385 MHz LSB ONLY
39 27.395 MHz LSB ONLY
40 27.405 MHz

 

[Superu]

Might have something to do with the fact that 23 used to be the top end channel on CB radios. I recall as a kid, when they added the additional channels to bump up to the present total of 40. :ylsmoke:

 

[Scenic WonderRunner]

Read down the page at this link.

http://www.ixradio.com/CB-radio.htm





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[James86004]

Read down the page at this link.

http://www.ixradio.com/CB-radio.htm





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Took a while but it is there. Superu, you were right, there were originally only 23 channels.

 

[Scenic WonderRunner]

Sorry, I didn't have time to paste it. I was running out the door.


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Channel assignments

To simplify selection of an operating frequency, Citizens' band radio is a two-way radio service that consists of 40 numbered radio frequency channels in the HF spectrum from 26.965 to 27.405 MHz, with channels generally spaced 10 kHz apart. Channel numbers are not strictly sequential with frequency.

There are unused 10 kHz assignments between channels 3/4, 7/8, 11/12, 15/16 and 19/20. These 'unused' frequencies are used by paging system transmitters and remote controlled toys such as toy boats and toy cars. These frequencies generally cannot be used by remote controlled aircraft, due to interference by CB radio in close proximity, which could crash the plane or helicopter into the ground, an object, or even a person. For this reason model aircraft can use the 72.0 to 73.0 MHz band instead, which contains 50 channels or licensed Amateur Radio operators can also use 53 to 54 MHz.

The gap between Channel 22 and Channel 23 (which is then filled by Channels 24 and 25) exists because originally CB radio ended at Channel 23. When the market grew extensively during the 1970s additional channels from 24 to 40 were added to the CB band.

This assignment of channels to frequencies has been adopted by many countries worldwide, including the U.K., although some countries have only approved the use of the first 22 channels.

The channel/frequency allocation for the 40 channels are as follows:

Channel Frequency

Channel 01 26.965 MHz
Channel 02 26.975 MHz
Channel 03 26.985 MHz

Channel 04 27.005 MHz
Channel 05 27.015 MHz
Channel 06 27.025 MHz
Channel 07 27.035 MHz

Channel 08 27.055 MHz
Channel 09 27.065 MHz (emergency channel)
Channel 10 27.075 MHz
Channel 11 27.085 MHz (unofficial general calling channel)

Channel 12 27.105 MHz
Channel 13 27.115 MHz
Channel 14 27.125 MHz
Channel 15 27.135 MHz

Channel 16 27.155 MHz
Channel 17 27.165 MHz
Channel 18 27.175 MHz
Channel 19 27.185 MHz (unofficial trucker's channel)

Channel 20 27.205 MHz
Channel 21 27.215 MHz
Channel 22 27.225 MHz
Channel 23 27.255 MHz
Channel 24 27.235 MHz
Channel 25 27.245 MHz
Channel 26 27.265 MHz
Channel 27 27.275 MHz
Channel 28 27.285 MHz
Channel 29 27.295 MHz
Channel 30 27.305 MHz
Channel 31 27.315 MHz
Channel 32 27.325 MHz
Channel 33 27.335 MHz
Channel 34 27.345 MHz
Channel 35 27.355 MHz
Channel 36 27.365 MHz
Channel 37 27.375 MHz
Channel 38 27.385 MHz (lsb, national calling frequency)
Channel 39 27.395 MHz
Channel 40 27.405 MHz

The frequency allocation list is supplied by the FCC (Federal Communications Commission) from Part 95 - Subpart D - Rules for CB Service Citizens Band (CB) Radio Service.





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[KA5IVR]

I remember being the 23 channel days. How old are you guys?

 

[ntsqd]

KAIC 7280

:sombrero:

 

[Scenic WonderRunner]

KAIC 7280

:sombrero:

That does not compute!....:sombrero:


You CB Radio hater....you....:elkgrin:



.

 

[HanzoSteel]

KAIC 7280

:sombrero:

KBAL 0901

:sombrero:

 

[Token]

I remember being the 23 channel days. How old are you guys?

I've still got a 23 channel CB around here somewhere and I'm only 40.. That was a screamin' little Corba.. Pretty sure it was overbuilt and under specified.. I haven't seen a new off the shelf radio that could even come close to it since..

 

[Ned B]

Kbgj 7305

 

[cletaco]

Still have my old Craig 4104 23 channel that I used in high school.

KAYF 6553

 

[Scenic WonderRunner]

I've still got a 23 channel CB around here somewhere and I'm only 40.. That was a screamin' little Corba.. Pretty sure it was overbuilt and under specified.. I haven't seen a new off the shelf radio that could even come close to it since..

That must be why I still keep using my 23 channel EF Johnson CB Radio since 1976....:victory:

At least somebody get's what I'm tryin' to say.....:ylsmoke:


OH! Is our CB Channel thread, turning into a Ham Call Signal Thread......:sombrero:

....hehe:elkgrin:




.

 

[HanzoSteel]

OH! Is our CB Channel thread, turning into a Ham Call Signal Thread......:sombrero:

....hehe:elkgrin:

Those are old CB call signs.

:sombrero:

 

[ntsqd]

That does not compute!....:sombrero:


You CB Radio hater....you....:elkgrin:



.

Well, er, no. That is my old CB call sign.
After this weekend though I have re-vowed my loathing of CB equipment, just not of CB.