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All posts by Wayne Cochran

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

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Divis (Northern Ireland) transmitter
Tuesday 5 February 2013 1:23PM
Armagh

Lynn Steenson, are you sure you're getting Freeview from Divis? Your PSB muxes are definitely on UHF chs. 21, 24 & 27?

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The difference in power between Brougher PSBs & COMs isn't anywhere near enough to cause problems with adjacent channel operation.

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Divis (Northern Ireland) transmitter
Thursday 7 February 2013 10:57AM
Armagh

You can't take it for granted that it's Divis, as Brougher Mountain can prove better in some areas of Monaghan.

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W
Divis (Northern Ireland) transmitter
Thursday 7 February 2013 11:53PM
Armagh

You've probably looked at this, but is the aerial pointing northeast for Divis? Brougher would be northwest.

Pre-DSO, Brougher used mostly the same frequencies as Divis, except for 1 mux. It's possible you could have aligned your aerial on either transmitter then & got all available services, even with slight mutual interference.

What exactly is happening now will depend on where your aerial is actually pointed. I would think there'll be a relatively straightforward explanation.

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Clairmont Cairn photos | Rigger's zone
Tuesday 19 February 2013 4:31PM

Re. the explanatory text for the photos: those 4 log periodic aerials (not 'Yagi type') for the supposed 'DTT trial', appear to be pointing in a northerly direction, so who was monitoring this 'trial'?

Also, the shrouds *are* for weather protection & possible protection from precipitation-static, especially if used for rx purposes.



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W
Divis (Northern Ireland) transmitter
Thursday 2 May 2013 11:05AM

Donaghadee seems to be in a good reception area for the Divis main transmitter, but could be prone to interference from Caldbeck in NW England.

I don't think they've done any 800 MHz 4G tests in NI yet.

Might be no harm to get your aerial system checked out.

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The guard interval has no function in rejecting different transmissions on the same channel as your wanted one. It's only useful wrt multipath reception of the same programme, either from a single transmitter or in an SFN.

The protection from uncorrelated interference comes from the error-correction, interleaving etc.

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Divis (Northern Ireland) transmitter
Wednesday 1 January 2014 1:34PM

Nothing weird: just that your receiver is right on its decoding threshold & a small drop in signal is enough for it to lose signal lock.

Most receivers will go from 100 - 0% with very little provocation.

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