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Tropospheric Ducting Forecast link
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Old 22-06-2020, 17:22   #1
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Tropospheric Ducting Forecast link

A useful link to a 6 day forecast for conditions likely to cause co-channel interference to analogue FM radio, DAB radio & Digital Freeview services.

If you start having problems particularly during the summer months itís worth checking these first before blaming your equipment or aerial system.

http://www.dxinfocentre.com/tropo_nwe.html
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Old 22-06-2020, 18:05   #2
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Re: Tropospheric Ducting Forecast link

My elderly neighbour was having problems with her Freeview reception last summer.

I checked all her connections and as she had a relatively new aerial and TV I started to look on the internet for possible explanations/fixes. I came across the site you have linked to and I also came across an article which explains and how Tropospheric Ducting or the Inversion Effect effects signals. Unfortunately on checking the forecast for our area it did not seem to be the reason for her problems.

I then found another possible explanation which can also cause similar Freeview interference. 4G. Honest it's legitimate and not just aluminium hat territory.

The site at800 was set up under Government direction ensuring viewers who rely on Freeview for TV continue to receive it when 4G services launch across the country.

We had had a 4G mast erected locally over a year previously and she not had any problems originally but I contacted at800 and they sent her a free filter which I installed and her reception is has been perfect ever since. No more pixellation or sound interference.
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Last edited by joglynne; 22-06-2020 at 18:09.
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Old 22-06-2020, 19:45   #3
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Re: Tropospheric Ducting Forecast link

The ironic thing is that the 800 MHz filters were designed to remove the interference from UHF channels 58 to 60. However these channels are also now reallocated for 5G with the top broadcast channel now channel 48 (once temporary Mux 7 closes on channel 55).

at800 are now supplying 700 MHz filters to combat 5G interference on channels 46 to 48.
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Old 22-06-2020, 20:19   #4
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Re: Tropospheric Ducting Forecast link

Thanks for that extra information nodrogd.
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