History of CB.

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History of CB.

Postby m0lsx » Sun Jul 23, 2017 8:39 am

I saw this link to via on the Southgate ARC news site & thought some CB'ers & others here may find it interesting.

http://ukspec.tripod.com/rf/cb/

The website of radio amateur RF-Man has an interesting article on the history of CB radio that covers UK usage from the mid-1960s and the early development of CB in the USA

The UK Citizen's Band Association was formed in 1976 to campaign for a legal CB service in the UK. The President was James M. Bryant G4CLF one of the many radio amateurs who actively campaigned for legalisation.


Breaker Magazine, issue 3

"Probably the first recorded users of the
illegal 27MHz band were the Charlie
Bravo Group who seem to have
appeared in about 1965. They used the
100 milliwatt hand-held sets which, in the
USA, required no licence, and worked on
channel 11. Later they moved up to ch 14
because of interference. In view of the
low power they escaped detection for
some years, but a number of prose-
cutions in the 70s forced them off the air.

They were quickly replaced in the
mid-70s by the Lima Echo Group who
had got sophisticated and mobile, using
the 23-channel rigs which were then
available in the States. Mostly they
worked ch 14 as well, using it as a private
net.

Really it was about then that the CB
boom began in the UK. Although the
Lima Echo Group didn't fold up as such,
the larger numbers of other illicit users
who gradually caught the bug swamped
them out and they sank without trace.

It was probably their use of 14 as their
net channel which first led to it being
established as the London calling chan-
nel- new users tuned in automatically.."


1967
The Wireless Telegraphy Act 1967 (a follow up to one from 1949) grants powers to the Home Secretary to ban manufacture or importation of specific radio apparatus. Paging systems had been operating on 26/27 MHz since the 1950s, so to protect them from interference ...


March 1979's "Custom Car" magazine spread the news to 140,000 purchasers (2m readers).

By the turn of the decade into the 1980s there were an estimated 100,000 breakers - activity picking up markedly from late 79 to early 80.


There is LOTS more worth reading at the site.

Read the article about CB Radio written by James Bryant G4CLF in the March 2, 1978 issue of New Scientist magazine
http://tinyurl.com/CBradioNewScientist
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Re: History of CB.

Postby G4RMT » Sun Jul 23, 2017 10:57 am

The Convoy movie perked the entire thing up I seem to remember!
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Re: History of CB.

Postby m0lsx » Sun Jul 23, 2017 12:22 pm

G4RMT wrote:The Convoy movie perked the entire thing up I seem to remember!


In some ways yes, but that was based on the C W McCall song Convoy, which predated it by several years. And the film Smokey & the Bandit starring Burt Reynolds was released the year before Convoy. As were a couple of other less popular films that also featured CB.
So in American terms Convoy was cashing in CB, but here in the UK it was probably the biggest game changer, as it made CB much more mainline.
I remember trying CB in about 78, just before Smokey & the Bandit & it was dead. You could hear stations miles away, as very few people were using it. When a friend showed me their radio in about 1980, the bands were packed. It was no longer a radio enthusiast, or a trucker thing. It was kids, housewives, the lot
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Re: History of CB.

Postby FreqFreak » Mon Jul 24, 2017 5:19 pm

Plenty to read there, thanks.
The SDR page http://ukspec.tripod.com/rtlsdr/index.html is a bit of a challenge - "Just as our 3 physical dimensions are all at 90 degrees to each other, this Quadrature malarkey has a 90 degrees phase involved too. You may also have heard of Complex Numbers, so beloved of engineers and Advanced Maths guys. Think of impedance in the radio world, and their two part values being a combination of resistive R and reactive X added in, shifted along 90 degrees by multiplication with that j fellow the square root of -1. You have the real numbers and the 'imaginary' part which is 90 degrees out of phase. I still shudder at the thought, I can't say I fully understand these '3D' numbers, but I've come to peace with my ignorance and can sort of get along with it." :huh: :shocker:
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