Band IV

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Band IV is the name of a radio frequency range within the ultra high frequency part of the electromagnetic spectrum.[1][2][3][4][5]

Sources differ on the exact frequency range of the band. For example, the Swiss Federal Office of Communications,[1] the Broadcast engineer's reference book[2] and Ericsson India Ltd[3] all define the range of Band IV from 470 to 582 MHz. An EICTA paper[4] defines the range as 474 to 602 MHz, whilst the BBC define the range as 470 to 614 MHz.[5] Band IV is primarily used for analogue and digital (DVB-T & ATSC) television broadcasting, as well as services intended for mobile devices such as DVB-H.

Television[edit]

United Kingdom[edit]

In the UK, Band IV allocations are 8 MHz wide, traditionally consisting of 14 channels from UHF 21 to 34 inclusive. However, in the mid-1990s the squeezing of analogue Channel 5 broadcasts into the existing national terrestrial TV transmitter network effectively closed a gap between bands IV and V, which was previously reserved for radar applications and home consumer devices. This stretched the practical definition of Band IV in the UK to cover 18 channels from UHF 21 to 38 inclusive.[6] Aerials of the group A type cover this band.[7]

The following table covers the most inclusive definition of Band IV in the UK. Rows with a yellow background indicate channels which were not traditionally (before the mid-1990s) considered part of Band IV for TV broadcasting purposes and may not be considered part of the band in other countries (e.g. Switzerland[1]).

Channel Frequency Range
21 470-478 MHz
22 478-486 MHz
23 486-494 MHz
24 494-502 MHz
25 502-510 MHz
26 510-518 MHz
27 518-526 MHz
28 526-534 MHz
29 534-542 MHz
30 542-550 MHz
31 550-558 MHz
32 558-566 MHz
33 566-574 MHz
34 574-582 MHz
35 582-590 MHz
36 590-598 MHz
37 598-606 MHz
38 606-614 MHz

References[edit]

  1. ^ a b c "Frequency characteristics and radio parameters". Swiss Federal Office of Communications. 2009-01-01. Retrieved 2009-05-17. 
  2. ^ a b Tozer, Edwin Paul J. (2004). Broadcast engineer's reference book. Focal Press. p. 166. ISBN 0-240-51908-6. Retrieved 2009-05-17. 
  3. ^ a b "700 MHz: Spectrum Issues". Ericsson India Ltd. 2009. Retrieved 2009-05-17. 
  4. ^ a b "TECHNICAL ASPECTS IN SPECTRUM ALLOCATION FOR DVB-UMTS CONVERGENCE TERMINALS". DVB-UMTS Group and EICTA. 2003. Retrieved 2009-05-17. 
  5. ^ a b "Television aerials factsheet". British Broadcasting Corporation. Retrieved 2012-07-07. 
  6. ^ "UHF channel and frequency guide". Digital Spy Limited. Archived from the original on 18 May 2007. Retrieved 2007-05-17. 
  7. ^ "Aerial Groups / Widebands". A.T.V. (Aerials and Television). Archived from the original on 23 April 2009. Retrieved 2009-05-17.