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High pressure causing channel loss through "Inversion"

High pressure does not just bring cold at this time of year, it is causing quite random loss of Freeview and analogue reception.

High pressure does not just bring cold at this time of year, it
published on UK Free TV

There is high pressure over the whole of the UK at the moment, and this causes the Inversion Effect. This is causing people to be missing a single Freeview multiplex, or have terrible analogue reception on a single channel. The problem may come-and-go or last for several days.

For details, please see What is the Inversion Effect and why does it effect my Freeview TV reception?.

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Sunday, 27 October 2019
steve byles
11:53 AM

picture breaking on some channels(eg 11 and 81) but not others
goes away during the day but really bad early is
is there a fault or maintenance work at Redruth transmitter?

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steve byles's 1 post GB

9:47 PM

steve byles:

Without a full postcode to see what the gives for predicted reception at your location, it'll be difficult to offer definitive advice.
I can find no reported faults on the Redruth transmitter, and there's currently no Planned Engineering.

The two channels you've mentioned (Pick & Talking Pictures) are on two different multiplexes - ArqA & ArqB.
Could you be more explicit about when it's really bad? How many times and how often is this happening?

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Chris.SE's 708 posts GB
Wednesday, 30 October 2019
Martin Wells
9:21 AM

Live in Bicester OX26 1BS, this post code not on the checker as it's a new address (18 months?) however reception has been perfect. From yesterday my HD channels and Freeview menus have had reception problems although my box says the signal is strong. I'm less than 12 miles from the Oxford transmitter so not sure what the problem is, could it be the weather?


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Martin Wells's 1 post GB

8:48 PM

Martin Wells:

One possibility is that the signal may be too strong. Please check what strength is reported by your television, concentrating on the most affected channels. If the strength is above about 85-90% then that could be the cause. To resolved that, insert a coaxial attenuator into the aerial lead feeding the TV, but add a flyw lead so the weight of the attenuator does not 'hang' on the coaxial socket of the TV.

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MikeP's 3,010 posts GB

10:11 PM

Martin Wells:

Whilst what MikeP says is a possibility, I think it unlikely even though you are indeed only about 12km from the Oxford transmitter with clear line-of-sight and had perfect reception for the last 18 months. There have been no recent changes at the transmitter, the power hasn't suddenly increased and I can find no trace of any reported faults or Planned Engineering.

Do you have more than one set? Do you have the same problem with all, if more than one?
I suggest you check all you coax plugs, connections, flyleads etc, unplug connectors check for corrosion or other problems and reconnect them. See what signal strengths and quality you are getting for all the multiplexes shown in your TV's tuning section, this might indicate whether there's a problem with your aerial or downlead. Also check that your downlead looks undamaged as best you can, and that your aerial seems intact and pointing in the correct direction (almost due S).

Problematic connections, water ingress etc. can seem to affect reception of just an individual, several or all multiplexes.

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Chris.SE's 708 posts GB
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