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No voice transmissions are permitted. It has six channels in the 27 MHz band. Five are unused 10 kHz CB assignments between channels 3–4, 7–8, 11–12, 15–16 and 19–20, and the sixth is shared with Channel 23. R/C transmitters may use up to 4 watts on the first five channels and 25 watts on the last, 27.255 MHz.
These roughly corresponded to the present channels 5–22, except for the two unique frequencies that are known as 11A (Channel 7 on an 18 channel Australian CB) and 19A (Channel 16 on an 18 channel Australian CB) or remote control frequencies but are no longer part of the Australian 27 MHz CB band since 40 Channels were introduced. [21]
Channel 40 is the primary road safety channel Australia-wide, most commonly used by trucks including pilot/escort vehicles for oversized loads. [6] [7] Users should be aware that UHF CB channels 31 to 38 and 71 to 78 are the 'input' channels for repeaters. Users should avoid using these channels to avoid interfering with repeaters.
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.
20 kHz channel steps 30.580–31.960 MHz 20 kHz channel steps, shared with State Forestry in some areas 33.120–33.400 MHz 20 kHz channel steps, some low-power frequencies 35.020–35.980 MHz 20 kHz channel steps, some low-power frequencies 37.440–37.880 MHz 20 kHz channel steps, often used for power and water company communications
In the Americas (defined as International Telecommunication Union (ITU) region 2), the FM broadcast band consists of 101 channels, each 200 kHz wide, in the frequency range from 87.8 to 108.0 MHz, with "center frequencies" running from 87.9 MHz to 107.9 MHz. For most purposes an FM station is associated with its center frequency.
South Africa allows use of nine 27 MHz CB frequencies between 27.185 MHz and 27.275 MHz (27 MHz CB channels 19–27). Maximal output power is 5 watts carrier power in AM mode and 12 watts PEP power in SSB mode. As with the 29 MHz allocation, each frequency is assigned to either AM only or SSB operation.
The UK channels that were legalised on 2 November 1981 were on two blocks of frequencies: 40 channels on the 27 MHz band and 20 channels on the 934 MHz band, both of which used FM (frequency modulation) and both unique to the UK. Equipment conforming with the 27 MHz CB27/81 Bandplan was identified as "CB27/81". In 1987 40 additional frequencies ...