Band III

Band III is the name of a radio frequency range within the very high frequency part of the electromagnetic spectrum. Band III ranges from 174 to 230 MHz, and it is primarily used for radio and television broadcasting. It is also called high-band VHF, in contrast to Bands I and II. Contents 1 Television 1.1 North America 1.2 Europe 2 Radio 3 Worldwide Usage 4 References // Television North America The band is subdivided into seven channels for television broadcasting, each occupying 6 MHz. Channel Frequency Range 7 174-180 MHz 8 180-186 MHz 9 186-192 MHz 10 192-198 MHz 11 198-204 MHz 12 204-210 MHz 13 210-216 MHz Europe European Band III allocations vary from country to country, with channel widths of 7 or 8 MHz. The standard channel allocations for most of Europe are 7 MHz wide and are as follows: Channel Frequency Range E5 174-181 MHz E6 181-188 MHz E7 188-195 MHz E8 195-202 MHz E9 202-209 MHz E10 209-216 MHz E11 216-223 MHz E12 223-230 MHz The Irish (8 MHz) system is shown below. Channel Frequency Range D 174-182 MHz E 182-190 MHz F 190-198 MHz G 198-206 MHz H 206-214 MHz i 214-222 MHz J 222-230 MHz Radio The band has only come into use for radio broadcasting within the last decade, and is used for Digital Audio Broadcasting. It is subdivided into a number of frequency blocks Block Centre Frequency 5A 174.928 MHz 5B 176.640 MHz 5C 178.352 MHz 5D 180.064 MHz 6A 181.936 MHz 6B 183.648 MHz 6C 185.360 MHz 6D 187.072 MHz 7A 188.928 MHz 7B 190.640 MHz 7C 192.352 MHz 7D 194.064 MHz 8A 195.936 MHz 8B 197.648 MHz 8C 199.360 MHz 8D 201.072 MHz 9A 202.928 MHz 9B 204.640 MHz 9C 206.352 MHz 9D 208.064 MHz 10A 209.936 MHz 10B 211.648 MHz 10C 213.360 MHz 10D 215.072 MHz 10N 210.096 MHz 11A 216.928 MHz 11B 218.640 MHz 11C 220.352 MHz 11D 222.064 MHz 11N 217.088 MHz 12A 223.936 MHz 12B 225.648 MHz 12C 227.360 MHz 12D 229.072 MHz 12N 224.096 MHz 13A 230.784 MHz 13B 232.496 MHz 13C 234.208 MHz 13D 235.776 MHz 13E 237.488 MHz 13F 239.200 MHz Worldwide Usage In the UK and part of Ireland, Band III was originally used for monochrome 405-line television. However this was discontinued by the mid 1980s. Some European countries (including Ireland) continue to use Band III for analogue 625-line colour television. Digital television in the DVB-T standard can be used in conjunction with VHF Band III and is used as such in some places. The use of sub-band 2 and sub-band 3 band for Digital Audio Broadcasting is now being widely adopted. Sub-band 1 is used for MPT-1327 trunked PMR radio, remote wireless microphones and PMSE links. In North America, use of the band for color television broadcasts is still widespread. Favorable propagation characteristics and reasonable power limits (up to 65kW for full-power digital television, versus 20 kW or less on VHF Band I) has meant that many US broadcasters elected to move their full-power ATSC stations from UHF frequencies to Band III VHF when all full-power NTSC analog television services in the US shut down in 2009. 1 References ^ FCC TV Query: US DTV construction permit listings for VHF Band I (ch 2-6) and III (ch 7-13) v · d · eBroadcast bands with Roman Numeral designations VHF Band I  · Band II  · Band III UHF Band IV  · Band V SHF Band VI