All posts by Dave Lindsay
Below are all of Dave Lindsay's postings, with the most recent are at the bottom of the page.
Anthony: Perhaps your problem is that the signal level is too high and the break-up is owing to it being OTT for your receiver. Why have you got a high-gain aerial and amplifier??
Freeview signals: too much of a good thing is bad for you | Digital switchover | ukfree.tv - 11 years of independent, free digital TV advice
You're only 11 miles from Winter Hill with some obstructions:
Terrain between ( m a.g.l.) and (antenna m a.g.l.) - Optimising UK DTT Freeview and Radio aerial location
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ron: The COM channels from Brougher are on much lower power than the PSBs - maybe it is just below the level required. Try a manual scan of UHF channel 24.
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Derek McLean: The predictor on this site rules out transmitters to which there is no line-of-sight, which would appear to be the case for Craigkelly (just):
Terrain between ( m a.g.l.) and (antenna m a.g.l.) - Optimising UK DTT Freeview and Radio aerial location
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Joyce Hodgeson: I suggest that this might be something you will have to live with. The reason is that the COM channels (those you've lost) don't have as good a coverage as the PSB ones (those you have). Some transmitters don't carry the COMs and where others do they are unavailable or intermittent due to interference from another transmitter on the same frequencies. In your case the COMs of Divis, which is the main transmitter which serves Belfast and other eastern parts of Northern Ireland, are on the same frequencies. Unsurprisingly, others along the coast have reported the same problem, or worse. It depends on how well the unwanted signals travel. Don't retune or they may be lost from your set totally and you will have to carry out repeated retunes in order to restore them (when they become available again).
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Angela Ward: Broadcasters have to have rights to show programmes. They will need be licensed to show on ITV+1 as well as ITV. The message implies that they didn't have the rights to show the programme on +1.
However, if the programme was Benidorm then it contained a reference to Rolf Harris and was not broadcast on +1 for that reason.
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tony: If you're using a communal aerial system then it may require adjustment for the new channel. Try a manual scan of UHF channel 56, if your TV offers manual tuning.
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M Roberts : The same signal which carries ITV also carries ITV2, Channel 4, Channel 5 and some others. So do you have these?
Further advice on reply.
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brian perry: What's the make and model of the box?
I've read on here that some HD receivers have issues whereby they are unable to receive more than one HD multiplex at a time.
With digital broadcasts each signal is a "multiplex" and each multiplex carries several services. So the HD multiplex that carries HD variants of BBC One, BBC Two, BBC Three, CBBC, ITV and Channel 4 is missing.
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Dr. S. Day: It may be worth noting that the two "lost" multiplexes are on C58 and C59, which are the two closest to any 4G signals operating in the 800MHz band, which have been allocated C60 upwards.
So it may be the case that a 800MHz 4G signal has come on air and is affecting either your TV or the amplifier within the aerial system. Either way, it's outside your control and should be reported to the party which maintains the aerial system (it needs filtering at the input so that the 4G signal doesn't enter the amplifier).
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Saturday 28 June 2014 8:43AM
Rob: Too high a signal level sounds a possibility:
Freeview signals: too much of a good thing is bad for you | Digital switchover | ukfree.tv - 11 years of independent, free digital TV advice
Fit an attenuator.