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All posts by Briantist

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


@Tom G

Good question...

"Who determines whether my home is one of them, and when? "

Before the digital switch-over, you could work out if you needed a new aerial by using a special "Teletext" page. This time they might do it by generating a temporary multiplex service that just consists of a single channel with the simple text saying "you don't need a new aerial".

So, you might be asked - by means of publicity - to see if you can see a special Freeview channel (say, "99") to check to see if your aerial is OK.

"Who is responsible for changing the antenna? "

This will be a body funded by the costs of taking over the new allocations, as per "at800".

"Who pays for changing the antenna? (That's especially important for 4 story houses with no roof access other than by scaffolding!) "

See above.

"What happens if a home has more than one antenna? "

See section 6.15 of http://stakeholders.ofcom….pdf "12% of households with outdoor aerials have multiple aerials"

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Janet Murry: That sounds very annoying. Can you see https://ukfree.tv/knowled…base ?

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All free TV channels in the UK
Friday 7 October 2016 3:50PM

P. Kieran Ward: Thanks. Normally Akismet: Spam Protection for WordPress removes all these posts before they ever appear. This seems to have been missed! I've banned the user, as you suggested.

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Map of all DAB transmitters
Monday 10 October 2016 12:06PM

Ofcom have changed their site around a lot over the weekend and moved lots of critical data files in the process.

The radio parameters are now here - Technical Parameters for broadcast radio transmitters - Ofcom - I have changed the site code to deal with their new location.

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Map of all DAB transmitters
Monday 10 October 2016 5:24PM

StevensOnln1: Thanks for reporting the Icomb Hill problem. It seems to have moved 10 meters to SP202228 in the Ofcom data so wasn't reponding to the SQL query using the "old" position.

It should be fixed now for you.

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nicholas: I think you might be getting things a little muddled.

Sky boxes do still use the transmission lines in the "blanking area" to fool VHS recorders' auto-levelling into making the picture dark and light. This happens only on the RF outputs.

The issue you describe "ghost outline follows the players" is actually an artefact of the MPEG-2 encoding system. A well known and fixed in MPEG-4 problem. Which is why you see it is SD that is always MPEG-2 in the UK and you don't see it on HD, which is always MPEG-4.

The MPEG-2 problem is that "motion blur" from left to right can't be compressed and causes a vast amount of extra data to be produced in the encoder. Because this will either break the bandwidth limit or buffer size, the encoder has to ditch some of the detail. Most of the time this is imperceptible live, but the moment you give people the ability to pause and live-rewind, it is more obvious.

The effect is even worse on lower horizontal-resolution channels (on Freeview) such as ITV4.

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John: Interesting.

The maps have been designed to allow you to see both town/city/village names and the roads. Other details has been turned off. I've just visually checked the above map and I can see the places and roads quite well...

You might find the maps on the prediction page more useful as you can change the selected transmitter. https://ukfree.tv/prediction and use your postcode.

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Map of all DAB transmitters
Tuesday 11 October 2016 6:32PM

StevensOnln1: The problem seems to be the data is missing from the Ofcom data - which is listed on Technical Parameters for broadcast radio transmitters - Ofcom and links to https://www.ofcom.org.uk/….csv .

You might like to tell them and then the data will appear on here again! Contacting Ofcom - Ofcom

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