Transmitter Power
At 500 kW E.R.P. for the four main analogue channels, Belmont was one of the most powerful transmitters in the UK, though there are four UK transmitters which were more powerful; Sutton Coldfield, Crystal Palace and Sandy Heath were all at 1000 kW and Emley Moor was 870 kW. Channel 5 was only broadcast at 50 kW from Belmont and digital at 20 kW (Mux 2), 10 kW (Mux 1, A, B) and 4 kW (Mux C, D) although this level of digital power is theoretically equal to 500 kW on analogue in terms of the received carrier to noise ratio required to give a "perfect" picture. After digital switchover Belmont's digital transmitting power rose to 50 kW for SDN (previously Mux A), 100 kW for Arqiva A & B (Mux C, D) and 150 kW for BBC A, D3&4 and BBC B (Mux 1, 2, B).
Different sources (even "official" ones) give differing digital output powers for Belmont; this is also the case for several other transmitters, e.g. this Ofcom source published Feb. 2009 and this Ofcom source.
Read more about this topic: Belmont Transmitting Station
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