UHF CB
From Wikipedia, the free encyclopedia
UHF CB is a class licensed (meaning licence-free use for most users) citizen's band radio service authorised by the governments of Australia and New Zealand in the UHF 477 MHz band. It provides 40 channels, including 16 channels (8 output, 8 input) allocated to repeater stations. It is similar in concept to the 40 channels used in United States' HF CB allocation, which is also available in Australia and New Zealand.
The equipment designs are similar to commercial land mobile two-way radio gear, 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. Except for repeater stations and stations using the data-only channels, transmitter RF power is limited to 5 Watts.
Use of CTCSS and Selcall are permitted for selective calling between CB users.
A feature of the Australian UHF CB band not available on HF CB is the availability of repeater stations to extend range. Repeater stations are available for use by all UHF CB radio owners but unlike them, repeaters are individually licensed by the Australian Communications and Media Authority and repeater owners pay a license fee. Channel 5 (and with its corresponding repeater station input, if a repeater is available, channel 35) are designated as emergency calling frequencies.
Channel 11 is designated as a calling frequency. Although not officially specified as such, channel 40 is usually used as a road channel to communicate with road travellers, truck drivers and the like.
"UHF CB" may also be used informally to refer to the FRS in the North America, PMR 446 in Europe, the Malaysian 477Mhz FRS service or similar, but these do not share the same band plan, power output, channels etc as UHF CB. It is usually illegal to use these systems in Australia and New Zealand as it is likely to cause interference with other licensed services. Care must be taken with radios imported from overseas to ensure they comply with local regulations.
| Channel | Frequency | Use |
|---|---|---|
| 1 | 476.425 | Rep Out Simplex |
| 2 | 476.450 | |
| 3 | 476.475 | |
| 4 | 476.500 | |
| 5 | 476.525 | Emergency |
| 6 | 476.550 | Rep Out Simplex |
| 7 | 476.575 | |
| 8 | 476.600 | |
| 9 | 476.625 | General |
| 10 | 476.650 | |
| 11 | 476.675 | Call Ch. |
| 12 | 476.700 | General |
| 13 | 476.725 | |
| 14 | 476.750 | |
| 15 | 476.775 | |
| 16 | 476.800 | |
| 17 | 476.825 | |
| 18 | 476.850 | |
| 19 | 476.875 | |
| 20 | 476.900 | |
| 21 | 476.925 | |
| 22 | 476.950 | Data Only |
| 23 | 476.975 | |
| 24 | 477.000 | General |
| 25 | 477.025 | |
| 26 | 477.050 | |
| 27 | 477.075 | |
| 28 | 477.100 | |
| 29 | 477.125 | |
| 30 | 477.150 | |
| 31 | 477.175 | Rep In |
| 32 | 477.200 | |
| 33 | 477.225 | |
| 34 | 477.250 | |
| 35 | 477.275 | Emergency |
| 36 | 477.300 | Rep In |
| 37 | 477.325 | |
| 38 | 477.350 | |
| 39 | 477.375 | General |
| 40 | 477.400 | Road Ch. |
[edit] External links
- UHF CB license conditions determination - The official license under which UHF CB operates
- Australian Communications and Media Authority - The Australian regulator of the radiofrequency spectrum
- VMB4 Newcastle - An example of an Australian UHF CB Repeater
- Malaysian Communications and Multimedia Commission - Malaysia's regulator for the converging communications and multimedia industry
Amateur and hobbyist
Amateur radio • Amateur radio repeater • Citizens' band radio • Family Radio Service
General Mobile Radio Service • Mobile rig • Multi-Use Radio Service • PMR446 • UHF CB (Australia)
Aviation (aeronautical mobile)
Air traffic control • Aircraft emergency frequency • Airband • Mandatory frequency airport • Single Frequency Approach • UNICOM
Land-based commercial and government mobile
Business band • Base station • Mobile radio • Professional Mobile Radio • Radio repeater • Specialized Mobile Radio • Trunked radio system • Walkie talkie
Marine (shipboard)
2182 kHz • Coast radio station • Marine VHF radio • Maritime mobile amateur radio
Signaling / Selective calling
CTCSS • Dual-tone multi-frequency • D-STAR • MDC-1200 • Push to talk • Quik Call I • Selcall
System elements and principles
Antenna • Audio level compression • Call sign • DC remote • Fade margin • Link budget • Rayleigh fading • Tone remote • Voice procedure • Voting (diversity combining)
