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All posts by will

Below are all of will's postings, with the most recent are at the bottom of the page.

Preece J: There is a trade-off between available capacity and the amount of error correction.

The more error correction there is, the easier it is to get the multiplex without error, but at the cost of available capacity.

The PSBs, BBCA and D3&4, have 1/3 of the transmitted data devoted to error correction, leaving 2/3 for actual services.

The COMs ARQA, ARQB and SDN have 1/4 of the transmitted data devoted to error correction, leaving 3/4 for actual services.

So, for example, BBCA has an available capacity of 24 Mbps (Mega bits per second) while SDN has 27 Mbps.

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PBS America
Monday 9 September 2019 5:50PM

Peter Snape: I give up. Why?

Seriously, if you want an answer, we need details like:

a) makes and models

b) how they get their signals

c) anything else that might have a bearing

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MikeP: According to this Digital UK document:

BBCB changed from UHF ch25 to ch37 on the 4th September.

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john: Sony Movies Christmas, formerly True Movies, is only available on Local Multiplexes.

The Bluebell Hill Local Multiplex is on UHF channel 21.

It may be that the Local Multiplex is not available at your location.

We need your postcode to see the predicted coverage at your location.

You can see for yourself if you go to and enter your postcode in the Coverage checker.

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Bluebell Hill (Medway, England) Full Freeview transmitter
Friday 20 September 2019 4:36AM

Ray Taylor: I've assembled some links that might contain an explanation:

Bluebell Hill - Possible weak signal

Coverage checker for TN14 7JW

New relay:
"11 July 2019
The BLUEBELL HILL transmitter group, serving north and mid Kent
Gillingham MOT

RF Channel
34PSB2 (D3&4)

Power change: the ERP will launch at 400W for all multiplexes":

Coverage checker for a Gillingham postcode:
Gillingham Testing Centre

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Chris.SE: Caldbeck Scotland, which is co-located with Caldbeck, has BBC B on UHF channel 21 and looks almost as good as Caldbeck from the given postcode - it's running at half the power of the Caldbeck BBC B.

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Winter Hill (Bolton, England) transmitter
Saturday 28 September 2019 12:30AM

MikeP: Yes Mike, it's a poor show.

They are different. "Liverpool TV" is on - you guessed it - L-LIV but L-MAN has "That's TV".

What's more, this:

shows both LOC1 (MAN) and LOC2 (LIV) moving from 56 to 24.

Confused? Not half!

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fincher: Try asking Sony:

There's a Contact Us link on the page.

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Divis (Northern Ireland) transmitter
Friday 11 October 2019 10:33PM

Denis: But, assuming we aren't powering something, do we need a DC connection at all, given that the stray capacitance between the centre conductor and pin is a virtual short at these frequencies?

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