The 27 MHz CB27/81 Bandplan is a list of the channel frequencies for FM CB radio in the United Kingdom.
Unlike CB usage in the United States, and subsequently elsewhere in the world, the original UK 40 channels progress in order with 10 kHz spacing. These channels apply to UK-only radios meeting MPT-1320 (marked CB 27/81)CB sets that attract unseasonal greetings, New Scientist, Dec. 17, 1981 page 809 and MPT-1382 (marked PR 27/97, these may also feature the additional 40 CEPT channels). In 2006, the UK 27/81 Bandplan was introduced by the Republic of Ireland's Comreg as one of two sets of channels available for the Wireless Public Address System (WPAS) licensing scheme (similar to the UK's CADS – Community Audio Distribution System), as many Irish churches were already illegally using UK 27/81 CB equipment for this purpose. Usage of the 27/81 channels for CB however remains illegal in the Republic of Ireland, though usage has been noted in areas near the Northern Ireland border.
+ CB27/81 Radio Channelshttp://www.ofcom.org.uk/static/archive/ra/publication/ra_info/ra246/ra246.htm Citizen's Band Information Sheet retrieved 2010 Dec 8 Channel Frequency [MHz] Channel Frequency [MHz] 1 27.60125 21 27.80125 2 27.61125 22 27.81125 3 27.62125 23 27.821254 27.6312524 27.83125 5 27.6412525 27.841256 27.65125 26 27.85125 7 27.66125 27 27.86125 8 27.6712528 27.87125 9 27.6812529 27.8812510 27.69125 30 27.8912511 27.70125 31 27.9012512 27.7112532 27.9112513 27.72125 33 27.92125 1427.73125 34 27.93125 15 27.7412535 27.94125 16 27.75125 36 27.9512517 27.7612537 27.9612518 27.7712538 27.9712519 27.78125 39 27.98125 20 27.79125 40 27.99125
By convention, channel 9 is set aside for emergency use, channel 14 is a 'calling' channel, where one CBer can call someone else before they both move to another channel for the bulk of their conversation. Channel 19 is commonly used by mobile stations (in vehicles).
References