I am missing a transmission multiplex?
Brian Butterworth published on UK Free TV If you are missing a single multiplex on a single frequency, it may be that you have a local source of interference - such as a VCR, games console or Sky Digibox - causing the problem rather than a poor signal from the aerial.
Try eliminating any such devices, and if one does appear to cause the problem, change it's RF output channel to a new value.
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Friday, 11 April 2025
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Darren Brown6:15 AM
Hi Chris
Sorry forgot to mention. When I click the search icon (magnifying glass), the search box has disappeared. Dont know if its affecting everyone or if its a problem with my computer.
Darren
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Darren Brown1:53 PM
Hi Chris
At around midday today, the signal on com4 dropped to quality = 94% and strength = 74%.
Darren
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Darren Brown11:11 PM
Hi Chris. Com4 and U&Dave went off again tonight at around 9pm. However, they came back on at around 9.30 with signal strength at about 90% but quality at 35-50%. Signal strength and quality have since gone back up to roughly what they were late last night and early this morning. I just wish I knew what was causing this dropout.
Darren
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Saturday, 12 April 2025
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Chris.SE5:09 AM
Darren Brown:
I also have the search box issue, so it's the site!
The last set of figures you posted are excellent. I think that proves beyond doubt that mobile cell interference is a primary problem here.
Chatton is currently on Planned Engineering, so there can be other variations in signal, so some of the "drop-outs" may be just that. U&Dave is on COM5/ArtqA.
It's encouraging signal returned at about 9.30. I think as you have now got some good figures, it's a case of watching what happens for a while.
Post the figures when you get any noticeable changes that persist for longer periods.
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Darren Brown9:24 AM
OK will do Chris. Thanks for all your help. Much appreciated.
Darren
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Wednesday, 30 April 2025
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Darren Brown11:26 PM
Hi Chris
I am pretty certain I have solved my signal issue. The Coax connections on my signal booster had become a bit loose, (probably with messing about with it so much) so I have replaced it with a Labgear booster with screw in connections (20 from Amazon) and also bought a SLX 5G filter (11.50 from B & Q). I have the filter on the aerial side of the booster. The signal and quality figures are pretty much the same as the last ones I posted but although the signal quality on COM4 still drops on an evening, it drops to about 55% which is not enough to knock the picture off altogether.
Thanks again to you and the rest of the guys for all the help and assistance.
Darren
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Thursday, 1 May 2025
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Chris.SE3:44 AM
Darren Brown:
Well all I can say is good luck with that then. I do not know how good or effective the SLX 5G filter is.
The filters supplied by Restore TV are to a high spec. standard that was specified and approved by OFCOM, I hope the SLX is a t least as good. You seemed to get the best results, from the figures you posted, when you had two in series on the aerial side.
I hope the Labgear booster has variable gain. Getting the right gain can be very important, high as possible without overload, as I emphasised in an earlier post, too much gain can be just as detrimental.
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Thursday, 12 June 2025
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Darren Brown6:08 PM
Hi Chris
Sorry to bother you again. TV still ok. Signal quality still drops on an evening to around 50 - 60% but still ok. However, after I did a retune last week. apart from the usual CH29, CH31, CH37, CH41, CH44 and CH47, I am picking up an intermittent signal on CH27, CH39 and CH43. The signal quality on these extra ones is only around 10 - 15% and I cant find any extra channels. Are these from Chatton or could they be from another transmitter? When I go into signal information on my TV, sometimes they are there and sometimes they are not.
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Chris.SE11:49 PM
Darren Brown:
Hi again.
Firstly, Chatton is listed for Planned Engineering again, so that will have a bearing on received signal which maybe on reduced power or the reserve antenna.
Secondly, there's been variable tropospheric conditions on and off for several weeks. So co-channel signals from other transmitters in the UK or Europe may start affecting your wanted signals. The usual initial effect is a reduction in the Quality %, if the interfering signals get strong enough ultimately signal strength goes to zero, because all that the set sees is noise!
Those signals you are seeing on C27, C39 and C43 will be coming from another transmitter, maybe more than one transmitter, it just depends on the tropo conditions at the time.
Unfortunately, nothing you can do about the tropo, you have to grin and bear it until conditions change but do NOT retune, unless, you are up for some experimenting to try and discover which multiplexes are on those channels that come and go, which may help identify the transmitter. Do so by Manual tuning of the UHF channel BUT in such conditions you may struggle to get your own tuning for Chatton back easily!
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