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In the run up to legalisation, many people wanted the unused since WW2, vhf bomber frequency for UK CB. This would have offered much better conditions for CB; nice clear channels without the chronic overseas interference there is on 27 MHz. This interference is often so severe, it even stops local contacts from being made, rendering 27 MHz CB totally useless. The fact is that short wave is not the place for short range two way radio; the professionals [Police, Fire Brigade, and Ambulance etc], all use vhf/uhf.
CB became legal in the United Kingdom in 1981; hence the logo stamped on all type approved radios of this era CB27/81 or CB934/81.
A licence is required to operate a CB Radio. This was at one time available from most major Post Offices within the United Kingdom for a small fee, but is due to be scrapped in 2004. No special test is required.
The channels legalised on 2nd November 1981 were on two blocks of frequencies. 40 channels on the 27 MHz band and 20 channels on the 934 MHz band both using FM ( frequency modulation). The 27 MHz band frequency allocation is shown here: 27 MHz CB27/81 Bandplan
Many CB users who witnessed the noisy & unruly conditions on 27 MHz, wanted to get away from all that and use the superior 934 MHz uhf CB allocation. In fact the cost of cutting edge [at the time] uhf radio equipment meant that only the more serious CB operator would use the band, a nice though expensive haven for mature CB operators, and radio hams who didn't like the 'red tape' of amateur radio. At first the range was limited, but as antenna restrictions were lifted and better equipment started to appear, the number of uhf CB operators grew. The 934 MHz band was eventually discontinued by the government on 31 December 1998 due to low user numbers, though this same argument doesn't affect the huge amount of frequencies that a relatively small number of radio hams can use. The main reason for the public refusing to accept the 934 MHz band was its cost [up to £500 for a radio], coupled with the fact that by the time reliable Japanese equipment became available in the mid 1980's, most people had opted for the noisy and cheap 27 MHz, or gone on to take the Radio Amateur Exam.
Later on in the 1990s the government allocated an additional 40 channels in line with the emerging European harmonisation and the American channel allocation method, although transmission was still only allowable using FM modulation.
The 27 MHz band frequency allocation is shown here: 27 MHz FCC Bandplan
There are three channels that have a specific use in the UK
CB users may use the phonetic alphabet and ten-codes.
The CB craze in the UK started off with a few individuals, particularly truck drivers, importing US equipment and using it illegally. It clearly served a need as the craze grew rapidly, reaching an enormous peak around 1980. While CB sets from the US had been used in the UK since around 1977, this was still a very small number of users. However, by 1979, the widespread existence of illegal CB was becoming common knowledge, especially among the more technically aware. Around this time, companies in Britain started to sell US equipment quite openly, as there was no law against selling or owning a set, only using one. At the same time, technically savvy engineers with a certain amount of curiosity about the rumours, started to convert radiotelephone equipment to use on the 27 MHz band. The result was an explosion in the number of users, and a huge growth in the CB culture that accompanied it.
While the number of users grew, the authorities were slow to react, but by the beginning of 1980, a number of police forces decided to take it upon themselves to start clamping down on illegal CBers. The normal authority for regulating the use of radio, the Home Office Radio Regulatory Department, were overwhelmed and could not possibly trace and prosecute every illegal user. The fact that the police weighed in to enforce the law is probably one reason why the craze grew and had a more extended life than it might otherwise have done - suddenly there was a common cause (the legalisation of CB) around which CBers could organise. As a result, CB clubs sprang up in most towns around the country, and numbers of users went through the roof. As the fad reached its peak towards the end of 1980, it became impossible to achieve more than a few miles range at most, such was the number of users jamming the channels.
Around this time, a number of CB-related periodicals appeared on the market, and you could buy CB equipment such as antennae in many ordinary car accessory shops. The CB clubs organised a number of national demonstrations in favour of legalisation, including a mass "convoy" to the heart of London, which brought the city to a standstill. In the face of overwhelming support, and the fact that the current situation was unenforceable, the government hastily commissioned a white paper proposing a CB service using the 934 MHz UHF frequency band. Among the enthusiasts, there was an outcry, since they wanted to use the 27 MHz equipment they had already invested in, despite the fact that the band was already allocated for model control and other applications. Eventually the government capitulated, and sanctioned both a 27 MHz and 934 MHz band. The CB lobby was appeased, until they saw the fine print - the new 27 MHz band used an odd channel offset and FM modulation, so it was incompatible with the American system. The reason for this was on the grounds of reducing as much as possible the interference to legitimate services. By then it was too late, the legislation had been passed, and the 27 MHz FM system was rushed in.
The new system was taken up enthusiastically by all those who had held back using an illegal system, and it was one of the biggest selling gifts for christmas in 1981. Those who had been using the illegal system for the previous few years felt they had been deceived by the government, and there was considerable resistance to the new sets from them. Many did make the change however. The combination of the old and new systems operating on a largely overlapping band rendered both systems more or less unusable, especially in the 6 month period following christmas 1981. With the fight won, albeit with a considerable compromise, and the system practically unusable, the remaining CB clubs gradually dwindled in membership, most disappearing altogether within a year.
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