Re: What Happened To Channel 1

[TELECOM Digest Editor's Note: This is an example of how someone

> screwed up when the Citizens Band radio channels were numbered. CB is > allocated the space between 26.965 kc and (originally) 27.255 kc. The > 'channels' were 10 kc apart, and there were (originally) 23 channels. > (Well, not originally, when there were 8 channels, but in later > years.) If you look at the difference between 27.255 and 26.965 as > divided in 10 kc increments you get more than 23. That's because the > FCC took three spaces in the middle and reserved them for use on > garage door openers. So we had channel 22 as 27.225 and channel 23 > a full 30 kc later, on 27.255. Then the FCC said they would expand the > CB area all the way up to 27.405, or 40 channels, although common > sense would imply actually 43 channels if you take 27.405 minus 26.965 > at 10 kc increments. What the FCC did, in an effort to 'tidy up' that > discrepany was run the channels slightly out of order. After channel > 22 (27.225) they created channel _24_ at 27.235, channel _25_ at 27.245, > then they had the (already existing) channel _23_ at 27.255 where it > had always been, and then by 10 kc up to channel 40 at 27.405.

There were more than three gaps left in the channels for radio-control. They are at:

26.995 (between channels 3 / 4) 27.045 (7 / 8) 27.095 (11/ 12) 27.145 (15 / 16) 27.195 (19 / 20)

then 27.235 and 27.245 as you say, which were later filled by channels

24 and 25. In addition, 27.255 was shared between CB channel 23 and the "blue" radio-control channel.

Having those two channels out of order in the frequency allocations

> did make for some tricky programming of the 'gang switches' > (revolving knobs which select the channels). PAT]

It also resulted in some interesting switching modifications over here in Britain as well, as when we finally got a legal CB allocation in the early

1980s it was just 40 channels running in straight 10kHz steps all the way (27.60125 through 27.99125).

I did quite a lot of EPROM burning to provide UK bands on export sets

20-odd years ago.

- Paul

Reply to
Paul Coxwell
Loading thread data ... Forums website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.