UHF CB is a licence-free citizen's bandradio service authorised by the government of Australia in the UHF 477MHz band. A similar frequency allocation is also used in New Zealand. It uses 40 channels like the United States HF CB allocation. A license or licence is a document or agreement giving permission to do something. ... A typical mobile citizens band radio Citizens band radio (CB) is, in the United States, a system of short distance radio communication between individuals on a selection of 40 channels within the single 27 MHz (11 meter) band. ... This article is about the radio frequency. ... A band is a small section of the spectrum of radio communication frequencies, in which channels are usually used or set aside for the same purpose. ... Since the electromagnetic spectrum is a limited resource, the use of its radio frequency bands is regulated by governments in most countries, in a process known as frequency allocation or spectrum allocation. ... For the geographical meanings of this word, see channel (geography). ... High frequency (HF) radio frequencies are between 3 and 30 MHz. ...
The equipment designs are similar to mobile two-way radio gear as used in the U.S., though a fair amount of inexpensive equipment is available that is roughly equivalent to the low-end gear commonly available in the U.S. and Europe for FRS/GMRS or PMR 446 usage. The three allocations are at different frequencies and are therefore incompatible, and usually illegal to use in each other's areas as it is likely to cause interference with other services. A two-way radio is simply a radio that can both transmit and receive (a transceiver). ... The Family Radio Service is an improved walkie talkie system authorized in the United States. ... The General Mobile Radio Service (GMRS) is a land-mobile radio service in the United States available for short-distance two-way communications to facilitate the activities of an adult individual and his or her immediate family members, including a spouse, children, parents, grandparents, aunts, uncles, nephews, nieces, and in... PMR446 (Personal Mobile Radio, 446 MHz) is a radio frequency part of the UHF range that is open without licensing for personal usage in most members of the European Union. ... Sine waves of various frequencies; the lower waves have higher frequencies than those above. ... The term compatibility has the following meanings: In telecommunication, the capability of two or more items or components of equipment or material to exist or function in the same system or environment without mutual interference. ... This article is about law in society. ... Interference of two circular waves - Wavelength (decreasing bottom to top) and Wave centers distance (increasing to the right). ...
"UHF CB" may also be used informally to refer to the FRS in the North America, PMR 446 in Europe, or any similar service, but this is mostly a fact of regulations and not an official name given to the service.
UHFCB suffers much less from interference and has better sound quality, but its range is much lousier.
The UHFCB repeater channels are numbers 1 through 8, with channel 5 reserved for emergency traffic, and the channel pair spacing is the same for all of them - 2 pairs with 32, 3 pairs with 33, and so on.
In Sydney, for instance, UHFChannel 1 is repeated by a chap in Hurstville whose repeater is instantly recognisable, thanks to its insertion of a "quack quack" sound effect every time someone dekeys (stops transmitting).
On UHFCB when repeaters are used it's termed duplex, and when repeaters aren't used it's termed simplex.
UHFCB radios are generally short range radios, and the Australian Government decided to limit the power of the CB radios so people couldn't talk too far and so I suppose there wouldn't be over crowding of the band due to a lot of high powered stations talking.
Beam antennae effectively harness the limited output of 477MHz CB stations and also cut down on interference from other stations that may be on the same channel although not along a direct path between the two stations.
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