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Changed multiplex names in shutdown notes

The various transmitter pages had a mixture of different multiplex styles

The various transmitter pages had a mixture of different multip
published on UK Free TV

The UK Digital switchover simulation page generates data that appears on many pages.

Due to creating this page back in June 2007, it used the old multiplex names that were used by Ofcom during the European frequency negotiations: PSB1, PSB2, PSB3, COM4, COM5 and COM6.

These are being used in place of the old, legal names Multiplex 1, 2, B, A, C and D - because of the change of allocations and modes.

As it turns out, 2/PSB2 and A/COM4 have remained the same before and after switchover, already being in 64QAM mode.

Since 2007, Ofcom now refers to the multiplexes by the owner's name, so they are now: BBCA, D3+4 (Digital 3 and 4 Ltd), BBCB, SDN (S4C Digital Networks), ArqA and ArqB (Arqiva).

However, BBCB whilst remaining the legal ownership of the BBC, has been used for the Freeview HD service.

S4C Digital Networks long since sold their multiplex to ITV plc (and spent the money).

I have, therefore, changed the database to reflect the usage of BBCA, D3+4, BBCB, SDN, ArqA and ArqB for primary use.

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Friday, 1 April 2011
Mike Dimmick

2:27 PM

2/PSB2 and A/COM4 aren't completely identical. 2 and A are in 2K mode, while PSB2 and COM4 are in 8K mode.

This doesn't affect capacity (or by only a very small amount), but does affect the robustness of the signal - 8K mode can cope with more distant/more delayed reflections.

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Mike Dimmick's 2,486 posts GB flag
Mike's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage

7:20 PM

Mike Dimmick: Thanks, yes, the mode change is another factor, which gets covered on the transmitter pages.

I was thinking more in terms of my database and code that puts up pages of what's where.

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Briantist's 38,899 posts GB flag
Friday, 13 May 2011
6:16 PM


I wonder if some-one can help me. We moved about 9months ago to the Caribbean. I have finally installed my tv and tuned it in but i have a problem.My analog is working fine but as soon as i switch to dtv i have no picture but only sound. could some one please advice me what to do to fix this problem.

Many Thanks

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theuns's 1 post FR flag

8:12 PM

theuns: Where did you move from and where did you move to, and what sort of digital system do you have (aerial, satellite, cable)?

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Briantist's 38,899 posts GB flag

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