All posts by Chris.SE
Below are all of Chris.SE's postings, with the most recent are at the bottom of the page.
Iain Davies :
As Steve has explained, it's due to the fact that UHF channels are co-channel with other transmitters and you just happen to be closer to one that's affecting reception of the channels you want, but coupled with which current weather atmospherics (tropospheric conditions that have come with this high pressure system) may be causing further problems with signals from other distant transmitters travelling further and causing interference.
Also one note of correction, UHF C29 PSB2 West is 2kW not 20kW, but because of the mode of transmission used (QPSK instead of 64QAM - it doesn't carry lots of channels) the coverage is almost as good as as the main PSB multiplexes.
| link to this comment |
Steve Donaldson:
As you well know, it is BAD advice to suggest a retune in such circumstances and it's a hangover from the days of pre-DSO transmissions, 800MHz and 700MHz clearance occasions. It's no longer relevant.
People should NEVER retune (IF they were correctly tuned to start with) when there is NO Signal or Badly Pixellated pictures. You CANNOT tune to signals that are not there or can't be decoded.
| link to this comment |
Mrs Johanne Sillar:
The Mendip transmitter is currently listed for Planned Engineering, however that shouldn't be causing you to have a total loss of signal, there is obviously something else amiss.
Current weather conditions will not be helping either however this shouldn't cause total loss, but we do need a full postcode to look at your predicted reception and then be able to advise in more detail.
Please also tell us where the aerial is located - chimney stack, wall mounted, loft etc. and what booster/signal splitter you have (model number if possible) and where that is located.
Where are you putting the filter - at the back of the TV or before the booster/splitter?
Does your TV Tuning section give Signal Strength and Quality figures for each multiplex's UHF channel? If so please post those as well as this may help identify a problem.
| link to this comment |
Stuart Tier:
How long have you had the problem? It could be current weather conditions, there is some tropospheric conditions around that will be causing interference problems for some on occasion. Such conditions can be very frequency dependant, so not all multiplexes will be affected, if indeed any others, it just depends on where the interfering signals originate.
That said, in addition to which, although Restore TV say postcards have not been sent to your postcode - see https://restoretv.uk/post…ure/
- there is a Vodafone mast less than 1.5km to the south of you, pretty well directly on the line of site to Rowridge. IF they've recently upgraded the mast to be using the 700MHz band, this could be an issue.
I'd continue to try a MANUAL retune for UHF C25 as your previous attempt(s) may well have cleared the correct tuning with there being No signal.
One other point, with Vertical polarisation, all the muxes are 200kW, I'm afraid the info on this site hasn't been updated correctly.
| link to this comment |
Henry Porcher:
Was your local "Aerial installer" CAI approved? I suspect not, as otherwise he'd have had the correct equipment - professional signal strength meters, spectrum analysers and the likes to identify the problem.
There are several things here that could cause issues and more information is needed to provide you with some constructive help, but firstly the Wrekin transmitter is "FIT for purpose" otherwise the transmitter page on this site, also other pages here and elsewhere would be full of reception issues and they are not. The transmitter is currently having Planned Engineering which has been so, on and off for a few weeks (like many main transmitters) but won't necessarily be causing the problems you are seeing, there is NO Sabotage and the BBC have absolutely no connection with the programmes that you've so far mentioned.
So let's start with the information needed.
Firstly a full postcode so we can check your predicted reception, which transmitter (if there's more than one) for best reception and which way your aerial should point.
It will also allow us to check for possible sources of interference.
Next, where is your aerial. Chimney stack, wall mounted, loft etc. and roughly how old is it? Do you perchance know what type it is?
Do you have any aerial amplifiers/splitters to feed more than one TV/Box? If so, do the problems occur on all sets? Where is it located? Can you tell us the model number of any such amp/splitter?
Can you list the channel numbers (LCNs) which are giving you pixelation problems? It sounds like LCN10 - ITV3 may be one of them.
If your set is an LG, in the TV Tuning section there's one section called Signal Test. It will have the Signal Strength and Quality figures for each multiplex's UHF channel that your are tuned to. Other sets will have similar information in different places.
If you can post the figures and list each multiplex UHF Channel that will be really helpful.
I look forward to all the information so that we can give you some proper help.
| link to this comment |
Henry Porcher:
1) Did you bother to read my reply to your previous post here Read this: Will Labour save the BBC? | free and easy for 21 years if you want help with your reception problems?
2) The "urban sprawl of inane garbage" is one of the "Transcriptions done by Google Cloud Platform." and as you may know Speech to Text sometimes gets it wrong, just like subtitles go wrong on LIVE tv speech.
| link to this comment |
Henry Porcher:
Just to add that your were advised 18 months or so ago and never responded. You know you are in a difficult location and that the traffic on the A5 & A483 are an issue, but as you haven't replied with the detail requested we can't see if there is a better way of doing things. So without the technical knowledge you just honk on a load of rubbish blaming the transmitter.
| link to this comment |
Thursday 7 November 2024 11:56PM
CHRIS MILLS:
Sorry, also meant to add that the other fly in the ointment at present is current atmospheric conditions coming with the high pressure system. There are some Tropospheric conditions affecting some parts of the UK (including the Anglia region) and this can cause signals from distant transmitters in the UK or Europe to travel further and cause interference to your wanted signals - this in fact might have been the cause of a No Signal - not all multiplexes are affected by such conditions as they can be very frequency dependant.