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Satellite TV disruption
Satellite TV disruption
by Pug of Cydree » Tue Aug 03, 2021 10:30 pm
Does anyone have any idea why the satellite TV ( English ) seems to vanish at about 12:15 and 19:15 for up to half an hour? Good the rest of the day, but get serious problems at these times.
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Re: Satellite TV disruption
by Red Rock » Wed Aug 04, 2021 8:30 am
Sorry pug I don't get that but my Channel 3 (ITV) disappeared a few months back.
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Re: Satellite TV disruption
by JamesB » Wed Aug 04, 2021 8:32 am
If you mean satellite TV as in satellite dish. We have 1.9mt dish for Sky and we always get wasps in the LNB this time of the year, which I solved by putting clingfilm over the opening, but it was always BBC and ITV that went off when one went inside.
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Re: Satellite TV disruption
by davebrandrick » Wed Aug 04, 2021 9:20 am
Pug of Cydree wrote:Does anyone have any idea why the satellite TV ( English ) seems to vanish at about 12:15 and 19:15 for up to half an hour? Good the rest of the day, but get serious problems at these times.
Sorry about this, but its technical
There is a layer of ionised air called the Heaviside layer at approx 90 -150km up. Because its ionised , it affects the propagation and reflection radio and tv transmissions. During the day the Solar wind presses it down and it sits lower. As the earth rotates into night and out the solar wind, the layer rises, cools, and its density drops, it spreads out and breaks up into several bands and it bends and disrupts the satellite signal. The effect is less noticeable in the winter.
https://ethw.org/Kennelly-Heaviside_Layer
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Re: Satellite TV disruption
by telmel » Wed Aug 04, 2021 9:44 am
Thanks for the technical explanation
I have a 1.9 m dish on my roof and am having problems with reception
I have also lost channel 3 , itv, but i can get it on channel 32 instead
My main problem is i have a dual LNB that feeds tv to the living room and bedroom
The tv in the living room is working fine, but i have lost all signals to the bedroom tv
I was thinking it might be a cable problem running from the dish to the bedroom but i have checked the connections and all seems ok
Can one part of the LNB stop working while the other part is ?
I have a 1.9 m dish on my roof and am having problems with reception
I have also lost channel 3 , itv, but i can get it on channel 32 instead
My main problem is i have a dual LNB that feeds tv to the living room and bedroom
The tv in the living room is working fine, but i have lost all signals to the bedroom tv
I was thinking it might be a cable problem running from the dish to the bedroom but i have checked the connections and all seems ok
Can one part of the LNB stop working while the other part is ?
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Re: Satellite TV disruption
by marcliff » Wed Aug 04, 2021 9:48 am
telmel wrote:Thanks for the technical explanation
I have a 1.9 m dish on my roof and am having problems with reception
I have also lost channel 3 , itv, but i can get it on channel 32 instead
My main problem is i have a dual LNB that feeds tv to the living room and bedroom
The tv in the living room is working fine, but i have lost all signals to the bedroom tv
I was thinking it might be a cable problem running from the dish to the bedroom but i have checked the connections and all seems ok
Can one part of the LNB stop working while the other part is ?
We lost ITV HD (channel 3) a while back. We then retuned the satellite box and put in an E Midlands postcode when prompted and now have the ITV HD channel back in full glory.
We were using a London postcode previously.
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Re: Satellite TV disruption
by Pug of Cydree » Wed Aug 04, 2021 4:43 pm
Have to advise I am a satellite engineer, but this problem is vexing me.
On my 1.8 dish no problems, don´t lose the signals other than high band ITV HD which are impossible to get in this area. low band ITV HD are receivable on some 1.25 ( sold as 1.4 ) dishes depending on exact location.
Yes, on a Freesat box changing the postcode will return ITV HD depending on dish size. If you have a 1.8m dish and cannot get, consult your supplier / maintainer as your dish could require to be re-aligned.
All ITV frequencies changed a while ago, SD variants can be restored by a rescan on free to air boxes, Freesat and Sky boxes should update on their own.
Cling film stops the bugs, but degrades quickly, use the white plastic stuff they use to protect most electrical goods in the boxes they come in. The newer clearer type can effect the signal, so not recommended.
I´m aware of the summer effect caused by the ionosphere but the recent drops twice a day are confusing me.
Myself and another specialist just outside Alicante are trying to find out what is causing the problem with these dips, ant thoughts or ideas welcome.
Oh! Nearly forgot, yes one part of an lnb can fail, but most likely a cable issue, check for inline joints or cable degradation.
On my 1.8 dish no problems, don´t lose the signals other than high band ITV HD which are impossible to get in this area. low band ITV HD are receivable on some 1.25 ( sold as 1.4 ) dishes depending on exact location.
Yes, on a Freesat box changing the postcode will return ITV HD depending on dish size. If you have a 1.8m dish and cannot get, consult your supplier / maintainer as your dish could require to be re-aligned.
All ITV frequencies changed a while ago, SD variants can be restored by a rescan on free to air boxes, Freesat and Sky boxes should update on their own.
Cling film stops the bugs, but degrades quickly, use the white plastic stuff they use to protect most electrical goods in the boxes they come in. The newer clearer type can effect the signal, so not recommended.
I´m aware of the summer effect caused by the ionosphere but the recent drops twice a day are confusing me.
Myself and another specialist just outside Alicante are trying to find out what is causing the problem with these dips, ant thoughts or ideas welcome.
Oh! Nearly forgot, yes one part of an lnb can fail, but most likely a cable issue, check for inline joints or cable degradation.
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Re: Satellite TV disruption
by davebrandrick » Wed Aug 04, 2021 11:33 pm
Pug of Cydree wrote:Myself and another specialist just outside Alicante are trying to find out what is causing the problem with these dips, ant thoughts or ideas welcome.
.
Is there a correlation between the disruption and solar events, ie the Solar Wind, or Coronal Mass ejections? There's a page here from NASA that monitors Space weather.
https://www.swpc.noaa.gov/communities/satellites
The Kp Index is a measure of the total Earths geomagnetic activity. If Kp rises above 4 you get auroras at the poles. There appears to be, in the short couple of weeks ive been watching this, a loose correlation when Kp peaks and my satellite signal starts to pixillated
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Re: Satellite TV disruption
by Wingnut » Thu Aug 05, 2021 4:26 pm
Our modern society relies on electronics.
What could possibly go wrong?
Google "Carrington Event"
What could possibly go wrong?
Google "Carrington Event"
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Re: Satellite TV disruption
by Pug of Cydree » Thu Aug 05, 2021 4:34 pm
davebrandrick wrote:Pug of Cydree wrote:Myself and another specialist just outside Alicante are trying to find out what is causing the problem with these dips, ant thoughts or ideas welcome.
.
Is there a correlation between the disruption and solar events, ie the Solar Wind, or Coronal Mass ejections? There's a page here from NASA that monitors Space weather.
https://www.swpc.noaa.gov/communities/satellites
The Kp Index is a measure of the total Earths geomagnetic activity. If Kp rises above 4 you get auroras at the poles. There appears to be, in the short couple of weeks ive been watching this, a loose correlation when Kp peaks and my satellite signal starts to pixillated
Good thought, but as the transmission satellites are on the Clarke Belt which follows the line of the Equator , polar clouds are very unlikely to cause transmission / reception issues.
As an aside, that´s why all satellite dishes in the Northern hemisphere look south and those in the Southern hemisphere look north. At the Equator the point straight up.
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