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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?.

Help with Freeview, aerials?
Can I attach a Freeview digibox to a Combi TV/Video unit?1
My high gain aerial can't get all the Freeview channels I expected2
I can't get Freeview yet, when will it start in my area?3
Are there plans to extend the range of regional variations on Freeview?4
How can I Receive Freeview on two TVs using one box?5
In this section
Official aerial installers guide to the TV spectrum future1
Which free digital TV system will give me the most reliable reception?2
Digital Region Overlap3
Freeview reception has changed?4
Two frequency interference 5
Single frequency interference6

Monday, 23 July 2012
Jim Charters
4:02 PM

Thanks for the reply. Belmont is on top of a the wolds; I live in a low lying area and found it difficult to receive the analogue signal at times and the previous low output digital one almost impossible periodically. To make matters rather worse, the rear of the property faces immediate woodland of about 50m depth (en route to Belmont)! The aerial is a Blakes JBX 32 element. Is this aerial really that sensitive?

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Jim Charters's 2 posts GB
Wednesday, 2 January 2013
10:22 AM High Wycombe

We have a Samsung 22" smart TV. We have recently been losing the use of all BBC channels including Radio channels intermittently. These were not accessible all yesterday (1st Jan/13) evening and have just returned 9.30am today.We are in south Bucks HP10 8AH

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Alex's 1 post GB
Alex's: Freeview map terrain plot frequency data R&TI Service digitaluk trade DAB coverage
Sunday, 28 September 2014
robert stevenson
8:44 AM

4G interference in Belfast. On RTE 2HD etc rf channel 56.
Most people who have Rte channels in Belfast will have a group CD mast head amplifier , this also in making the 4G signal which is on rf channel 63 wipe out or cause picture breakup on the Rte and normal BBC ,itv freeview channels .
I have changed a few headlamps as they were high gain ,mostly CD 1223 or even the old red CD supreme. I fixed these issues by fitting a Labgear outdoor 4g rejection filter and a CD1213 mast head amp. This should work as the Rte freeview from down south is now a good strong signal . You may not even need a mast head amp it depends on the set top box or tv you are using also which way or type off splitter there may be if the aerials are connected to feed more than one tv.
Also remember the more splitters and joints etc and cheap rf fly leads these cause big problems with reception issues.
Please email me if you have any 4G issues etc and I will try and advise via email. We are the only CAI registered and approved installation company in Newtownabbey and Belfast .
Hope this is helpful.

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robert stevenson's 2 posts GB
Monday, 26 October 2015
Beth Young
10:29 AM

The past year I have been getting a loss of picture seems to flash on & off then off altogether with the message NO SIGNAL. Stays off for from 15 mins to 6 hrs. I have had the outside area chked to no avail. Sometimes I also get like a raydar effect like sweeping for aircraft...... the loss of signal is now so bad as to make me only use the tv as a monitor for films. Thank you. Beth

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Beth Young's 1 post GB
10:55 AM Trowbridge

Beth Young:

For any contributor to be able to help we would need to know where you live by giving a post code, or that of a nearby public building, and the make/model of your TV equipment. It would also help to know if you have your own aerial and where it is located or whether you are connected to a communal aerial system.

There can be many reasons for your reported problem, such as trees, buildings, hills, interuptions in the 'line of sight' between you and the transmitter, and so on. Hence the need for location information. Different makes of TV can have either a more sensitive tuner or a less sensitive one, hence the benefit of knowing what make/model.

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MikeP's 215 posts Silver Silver GB
MikeP's: Freeview map terrain plot frequency data R&TI Service digitaluk trade DAB coverage
Monday, 12 December 2016
Chris Evans
7:16 PM

I have deleted my entire channel list and re-scanned for channels and have found 137 channels - however none of the free view channels on channel 54 are being found - bluebell hill transmitter showing 76% strength and 100% quality

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Chris Evans's 1 post GB
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