All posts by Dave Lindsay
Below are all of Dave Lindsay's postings, with the most recent are at the bottom of the page.
Jeff Harris: Check that BBC services are tuned to Dover on UHF channel 50 (706MHz) by viewing the signal strength screen.
Do you have a Sky box, or some other box, putting out an analogue signal on, or near, UHF channel 50?
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Jack Luxon: If the booster is unnecessary then why use it? In such circumstances then the suggestion is that it would be removed.
If the booster is required then at800 will arrange for a filter to be fitted before the booster (if it is mounted on the roof).
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Barbara Finch: What I suspect you may have alluded to is the fact that you reside in a block of flats and therefore use a communal aerial system. In which case the communal aerial system may require adjustment so as to let through from the aerial the new frequency (used by ITV, Channel 4 etc). So the answer to your question may be "when the engineer visits your block". If no resident has reported the issue to the party responsible, because everyone is waiting for someone else to do it, then it may not get done.
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Paul Waite: I would suggest that you need to look at the parts that are common to the two TVs. If there is a powered booster try bypassing it; don't assume that just because the power light is on that it is functioning normally.
You obviously believe in coincidences (as in both TVs have failed together) or that the powers that be have decided to change all the channels on a Saturday afternoon.....
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Jack Luxon: The issue with 4G in the 800MHz band may affect amplifiers and therefore any filter should go before an amplifier.
Prior to digital switchover the digital signals operated on lower power than the analogue. Whilst they did serve viewers closer to the transmitters (without the need of an amplifier or replacement aerial) those further away may have replaced their aerials or added amplifiers to bring in the weaker digital. The same may have been true for Channel 5 analogue which, for those transmitters that carried it, was on a lower power than the other four channels.
Today the power of the digital signals, for the Public Service (PSB) channels at least is equivalent of the former four-channel analogue and within the former analogue aerial group with all but a handful of tiny exceptions. The Commercial (COM) channels are not far behind - quite a few transmitters have COMs at half power to PSBs (for the transmitters that they broadcast from).
Obviously the other time amplifiers are used is for distribution. They are probably used at all distances from transmitters, so not necessarily only in weak areas.
Apparently there is a new "wideband" aerial group T which is 21 to 60:
Aerials, TV Aerial and Digital Aerial
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Paul Waite: This definitely doesn't sound like co-channel interference due to the weather. The reason being that there are five separate channels/frequencies and it is not likely that all would be affected to about the same degree at the same time.
I would be looking at the common bits, such as the connection to the aerial and the other end of that cable.
Are you sure that what you regard as a "powered booster" adjacent to your main TV is in fact so and not a power supply for a booster fitted in the loft to split the signal?
If the signal is split using an unpowered splitter then, from what you describe, the bedroom feed isn't amplified. However, the main TV is. But if there is sufficient signal strength (under normal operating conditions) for the bedroom TV to work then this may also be so for the main TV and the booster may be redundant.
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Rekha: Stations do get removed from DAB multiplexes and Ofcom provides monthly updates on this, but there isn't one for June yet. The latest is for May:
Ofcom | Radio Broadcast Update May 2013
On that one is says that Sunrise Radio was removed from the Glasgow/Edinburgh multiplex.
It might be worth giving them a ring to see if this is what has happened on the London DAB service: Sunrise Radio Group
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Saturday 8 June 2013 4:25PM
Alex Fuller: Have you checked that BBC One is tuned to UHF channel 57 and not 23 which is Crystal Palace?
If it is then interference from one of the other high-power transmitters on C57, maybe:
C57 (762.0MHz) after switchover | ukfree.tv - 10 years of independent, free digital TV advice
Perhaps Waltham or Oxford, maybe carrying due to lift conditions (owing to the weather).
The Digital UK prediction for St Albans at your location isn't great at all, but it is for Crystal Palace. Perhaps you can receive all channels from Crystal Palace. That said, I note there are quite a few tall buildings and trees in the area that may make reception from particular transmitters difficult.