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Old 09-07-2013, 22:57
albertd
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Just assuming tropospheric lift is causing the problem is on par with blaming 4G just because it's been reported in the media. (I'm not suggesting that you are doing this, just a general point).
I am finding difficulty trying to understand the parallel that you are trying to draw there.

4G is a very new potential problem which is not yet understood very well, whereas co-channel tropospheric interference problems have been with us since the late 1950s and are very well understood indeed.

I have been seeing the effects of this problem at regular intervals for all of that period, having had TV in my life since before the start of ITV which is where it first showed up.

There is a great probability that problems at the present are from that source.
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Old 09-07-2013, 23:43
jj20x
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I am finding difficulty trying to understand the parallel that you are trying to draw there.
Any source of interference gets reported on here and someone comes forward and says it must be from 4G. Often when it hasn't even been launched anywhere near the area concerned.

The parallel would be, as some people are experiencing problems due to tropospheric lift, certain users start jumping on that bandwagon. Say, a group of multiplexes are taken down for a short while at a certain site to allow antenna work to be undertaken, a user notices a lack of service and reports that on here. Someone jumps in and says "oh, it will be atmospheric conditions". Sure it could be, but if the transmitters were powered down for a while at a given site, that just might have caused it too.

And yeah, I know about tropospheric conditions and used to take advantage of lift a few years ago, when I was at a better location with a steerable aerial. At the moment I cannot receive anything from Bilsdale, largely because reception is marginal and the current conditions are probably bringing in enough co-channel interference to block it completely.
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Old 10-07-2013, 06:46
albertd
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Yes, I see what you are getting at now, though it is a rather tenuous connection. Let us just say that the chances of random problems occuring when there is a lift happening are quite high and should not be ignored otherwise people will be chasing around looking for other reasons like aerial faults etc when, if they were to wait a few days, the problem would go away of its own accord.

Clearly, other reasons for loss of service like you describe are possible, but searching for them when a lift is happening is a bit pointless until that much more obvious possibility has ceased.

By the way, 800MHz 4G is not in service anywhere yet, though there have been a few tests in some areas.
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Old 10-07-2013, 09:09
ecco66
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I've been getting break ups and drop outs on a number of channels for the past few days, and more French DTT channels than normal came up when I did a re-scan!
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Old 10-07-2013, 14:09
aciddad
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Thanks for the explanations. I had the same trouble early today so I guess high pressure is the problem. I must have been lucky previous years as I have never seen this before, but then I was only 15km from Emley Moor until May this year.
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Old 10-07-2013, 14:41
jj20x
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By the way, 800MHz 4G is not in service anywhere yet, though there have been a few tests in some areas.
More specifically:

https://at800.tv/faq/will-4g-masts-a...ew-in-my-area/
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Old 10-07-2013, 15:31
Nigel Goodwin
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Thanks for the explanations. I had the same trouble early today so I guess high pressure is the problem. I must have been lucky previous years as I have never seen this before, but then I was only 15km from Emley Moor until May this year.
With major stations like Emley Moor it's less of a problem - because they are so high powered, so you pretty well have to have a fairly marginal signal to start with to suffer interference.

Also, as it doesn't pick up it's input 'off air' it can't suffer incoming interference.

If you're on a relay the interference can be present on the relay input (and as the relay is normally on top of a hill it's likely to have a decent view to the continent). In the analogue days it wasn't uncommon for the local relays to briefly re-broadcast foreign TV at times

You're also far more likely to get direct interference on a relay as well, as their output powers are far lower.
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Old 10-07-2013, 15:39
albertd
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By the way, the Ducting Forecast is suggesting strong activity for tomorrow morning (see 0600 11/7/13 chart), but reducing later in the day.
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