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All posts by Ash

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

DAB maps - another update | Blogs
Friday 10 June 2011 8:44PM

Briantist, DAB can have multiple transmitters covering the same area - that's the whole point of it being an SFN.

As long as the transmitters are all synchronised by GPS then all is well.

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DAB maps - another update | Blogs
Friday 10 June 2011 10:11PM

By the way... Digital One and NOW Digital do publish coverage maps on their websites.

ukdigitalradio: Coverage

and

http://www.localdigitalra….php

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DAB maps - another update | Blogs
Monday 13 June 2011 5:21PM

Hi Briantist, there isn't a mush zone created in a DAB SFN! The neighbouring transmission sites in a DAB network do not have their radiation patterns changed when a new site comes on.

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Welcome back and get well soon!

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Automatic postcode fixes
Sunday 10 July 2011 2:30PM

Hi Brian,

I like your postcode feature, but I dislike the way the site then makes it public for all to see. That's why I have made posts with more than one email address, this one doesn't reveal the street I live in to the outside world. It would be nice to have some kind of privacy setting!

Ash

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DAB maps - another update | Blogs
Tuesday 19 July 2011 9:53PM

Briantist - some posts appear to have dissapeared from this page?

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Automatic postcode fixes
Tuesday 19 July 2011 9:55PM

Briantist: OK, I'll give you the benefit of the doubt. I thought they appeared next to people's usernames but it now seems a placename appears instead.

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DAB maps - another update | Blogs
Wednesday 20 July 2011 8:40PM

...ah I see. My follow up post and the posts that other people who lept to my defence regarding SFNs must have been sucked up by the SPAM system?

Anyway... I managed a DAB multiplex network for four years, so I DO know a bit about how DAB SFNs work!

I can tell you that when a new TX is turned on, the others in the SFN are not adjusted. As long as the DAB transmitters are all sync'd by GPS, then it is just a case of turning a new site on and leaving the rest alone.

On rare occasions it may be the case that a particular location in a TX area may receive a signal from a local site, and another over 74km away - in this case the GPS timings would be tweaked rather than radiating patterns.

Otherwise, a DAB receiver is perfectly capable of receiving the same multiplex from more than one transmitter.

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All DAB transmitters
Thursday 21 July 2011 6:48AM

Nice pages.

Just a couple of observations....

You've sourced the data from Ofcom's TX parameters?

If so, it will probably be better to be quoting the in-use ERP (in KW) rather than difference in directional ERP (in W), because the in-use ERP better reflects actual coverage on the ground.

The other thing, is a word of caution regarding stations. Some can appear before they go on-air, and it is also possible for some to remain there even when no longer licenced by Ofcom (such as KARD on South Hampshire). It is probably worth keeping tabs on Ofcom's monthly radio update mailing list, which is usually sent the first Tuesday of every month to see what is/isn't licenced.

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All DAB transmitters
Thursday 21 July 2011 5:43PM

Hi Brian,

Some fantastic work!

The TX Params depend on the multiplex operators keeping Ofcom up to date with station/multiplex names. Obviously, whilst I was good at this, not all other multiplex operators are, which is why 'X F M' still appears!

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