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The majority of cb channels are 10 khz apart... for example channel 1 is 26.965... channel 2 is 26.975. Alot of the channels go up or down in 10 khz ( 10 kc or 10 kilocycles... its all the same). But there are some channels where there is a 20kc jump between them. Between channel 3 (26.985) and channel 4 ( 27.005)... between channel 7 and 8.... channel 15 and 16.... channel 11 and 12... channel 19 and 20. etc etc

So technically... since all cb channels occupy10kc of space .... there is technically another channel between channel 3 and 4... channel 11 and 12.. channel 15 and 16 etc etc.
These are usually called the A channels as GRTS pointed out.
Basically what a 10 kc jump switch will do is enable you to jump from channel 3 to channel 3 A or in other words between channel 3 and 4... or jump to 11a which will put you on a channel between channel 11 and channel 12. Between channels.
Its like there are a few extra channels out there to talk on. I don't know how often they are used in your area... but we used to sneek off to these channels when there was a bunch of fools on the air that no one wanted to talk to or hear.... of course we had capable radios and he did'nt so we could sneek between channels.

Thats the only thing the 10 kc jump will do... it will let you jump up or down to get these "A" channels. With some radios.. you will be able to get only certain "A" channels by jumping up ( from 11 jump up to 11a)... other ones you will only be able to get to by jumping down( channel 16 jump down to 15A)

Thats the way it is with some PLL's... you have to jump up to get to some A channels and jump down to get the others..... so if you only do a 10 kc "jump down" mod" you will only get some of the A channels. You need to be able to jump up and down to get all the a channels on alot of radios.

<blockquote data-quote="bushwacker" data-source="post: 96547" data-attributes="member: 527">The majority of cb channels are 10 khz apart... for example channel 1 is 26.965... channel 2 is 26.975. Alot of the channels go up or down in 10 khz ( 10 kc or 10 kilocycles... its all the same). But there are some channels where there is a 20kc jump between them. Between channel 3 (26.985) and channel 4 ( 27.005)... between channel 7 and 8.... channel 15 and 16.... channel 11 and 12... channel 19 and 20. etc etcSo technically... since all cb channels occupy10kc of space .... there is technically another channel between channel 3 and 4... channel 11 and 12.. channel 15 and 16 etc etc.These are usually called the A channels as GRTS pointed out.Basically what a 10 kc jump switch will do is enable you to jump from channel 3 to channel 3 A or in other words between channel 3 and 4...&nbsp; or jump to 11a which will put you on a channel between channel 11 and channel 12. Between channels.Its like there are a few extra channels out there to talk on. I don&#039;t know how&nbsp; often they are used in your area... but we used to sneek off to these channels when there was a bunch of fools on the air that no one wanted to talk to or hear.... of course we had capable radios and he did&#039;nt so we could sneek between channels.Thats the only thing the 10 kc jump will do... it will let you jump up or down to get these &quot;A&quot; channels. With some radios.. you will be able to get only certain &quot;A&quot; channels by jumping up ( from 11 jump up to 11a)... other ones you will only be able to get to by jumping down( channel 16 jump down to 15A)Thats the way it is with some PLL&#039;s... you have to jump up to get to some A channels and jump down to get the others..... so if you only do a 10 kc &quot;jump down&quot; mod&quot; you will only get some of the A channels. You need to be able to jump up and down to get all the a channels on alot of radios.</blockquote>

[QUOTE="bushwacker, post: 96547, member: 527"] The majority of cb channels are 10 khz apart... for example channel 1 is 26.965... channel 2 is 26.975. Alot of the channels go up or down in 10 khz ( 10 kc or 10 kilocycles... its all the same). But there are some channels where there is a 20kc jump between them. Between channel 3 (26.985) and channel 4 ( 27.005)... between channel 7 and 8.... channel 15 and 16.... channel 11 and 12... channel 19 and 20. etc etc So technically... since all cb channels occupy10kc of space .... there is technically another channel between channel 3 and 4... channel 11 and 12.. channel 15 and 16 etc etc. These are usually called the A channels as GRTS pointed out. Basically what a 10 kc jump switch will do is enable you to jump from channel 3 to channel 3 A or in other words between channel 3 and 4... or jump to 11a which will put you on a channel between channel 11 and channel 12. Between channels. Its like there are a few extra channels out there to talk on. I don't know how often they are used in your area... but we used to sneek off to these channels when there was a bunch of fools on the air that no one wanted to talk to or hear.... of course we had capable radios and he did'nt so we could sneek between channels. Thats the only thing the 10 kc jump will do... it will let you jump up or down to get these "A" channels. With some radios.. you will be able to get only certain "A" channels by jumping up ( from 11 jump up to 11a)... other ones you will only be able to get to by jumping down( channel 16 jump down to 15A) Thats the way it is with some PLL's... you have to jump up to get to some A channels and jump down to get the others..... so if you only do a 10 kc "jump down" mod" you will only get some of the A channels. You need to be able to jump up and down to get all the a channels on alot of radios. [/QUOTE]

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