All posts by Wayne Cochran
Below are all of Wayne Cochran's postings, with the most recent are at the bottom of the page.W
Brougher Mountain (Northern Ireland) Full Freeview transmitter Thursday 7 February 2013 10:47AM
Armagh
The difference in power between Brougher PSBs & COMs isn't anywhere near enough to cause problems with adjacent channel operation.
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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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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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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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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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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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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?