In gusty winds, TV signals disappear and can only be restored by powering the receiver off and on again. Or at least that's the only way I've discovered so far to restore normal operation.
The setup is a little unusual: a satellite internet link (which continues to work throughout the gusts, so dish pointing isn't the issue), a DVB-S LNB offset by the appropriate amount so that it 'sees' the Astra 2A-B-D satellites instead of the Europasat internet satellite which the dish is aimed at, a dish motor so that I can look at other TV satellites if I don't mind losing the internet connection, a multiplexer on the roof to combine DAB, FM, terrestrial and satellite signals, and a matching demultiplexer beside the receiver.
It all works perfectly if the wind isn't blowing, but gets into some odd state where the TV signal goes from 90% signal strength and 73% signal quality to near zero strength and zero quality after a variable number of gusts.
The coax downlead for TV is about 20 metres long and has a copper-coated steel inner and a foil and braid outer. I used the best coax only for the internet connection, which might have been a mistake. I wish now that I'd used top quality solid copper coax instead of stuff with a copper coated steel inner, which must be more prone to electrolytic corrosion and may have a higher resistance.
In desperation I may try replacing/remaking all the 'F' type coax connectors, though I'm not sure why a poor connection would give the odd effects in question.
Does a dish motor automatically drive a dish back to the original position if a gust moves it a fraction of a degree away? That, happening repeatedly, might (I suppose) overload the power supply from the receiver, or cause a sudden drop in voltage which could confuse the TV LNB.
The dish, motor, and receiver are all Fortec Star, which work well enough in simpler setups.
Has anyone had similar experiences?