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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 <img src="data:image/png;base64,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" class="xico" style="vertical-align:text-bottom" alt="www.ukfree.tv link icon"> link iconWhat is the Inversion Effect and why does it effect my Freeview TV reception?.

<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQAgMAAABinRfyAAAACVBMVEUAAAD8/vwEAgTo1XnGAAAAAXRSTlMAQObYZgAAADNJREFUCNdjYMAEjKsYGP4xvfnNsIGJmXF/ANPf/w4MTMyMBxiY/v533MC4ioHhHwMuAAAmbgz06BzauwAAAABJRU5ErkJggg==" class="xico" style="vertical-align:text-bottom" alt="www.bbc.co.uk link icon"> link icon





Freeview, aerials?
My Freeview box has no EPG, is blank on FIVE, ITV3, ITV4, ITV2+1, has no sound o1
I have now lost all signal can you tell me what the problem might be?2
My ITV/C4 Freeview channels have disappeared - what can I do? Is it my SCART ca3
What is the Inversion Effect and why does it effect my Freeview TV reception? 4
My high gain aerial can't get all the Freeview channels I expected5
In this section
Which free digital TV system will give me the most reliable reception?1
Digital Region Overlap2
Freeview reception has changed?3
Two frequency interference 4
Single frequency interference5
Freeview intermittent interference6

Comments
Monday, 23 July 2012
J
Jim Charters
4:02 PM

Dave
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?
JIM

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Jim Charters's 2 posts GB
Wednesday, 2 January 2013
A
Alex
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
R
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
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