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1113 posts

Uber Geek
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Topic # 128702 20-Aug-2013 19:04
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Hi all

We have a Freeview roof-mounted aerial which is then split five ways to different rooms in the house, terminating to PAL outlets. Reception is very good, but in one room I am having a problem that is annoying me. The room has a small Panasonic LED TV mounted on the wall, behind the TV are the power, Ethernet and PAL outlets. Initially, signal quality was fine but in the last couple of weeks it has degraded to the point where I am getting either 'No Signal' messages on screen, or just a bunch of garbled pixels. I took the TV off the wall and plugged it in to an outlet in another room to prove whether the PAL outlet was faulty. The signal was fine in the other room so I initially put it down to the outlet. But then I went back to the original room and tried it again while off of its mount, and signal was fine... after a bit of fiddling about I realised that the signal was being lost when the aerial cable between the PAL outlet and the TV crossed paths with a power cable. I replaced the aerial cable but the same thing happened. I then replaced the power lead (standard figure-8 lead) and still the same thing happened. Because of the way it's mounted and the position of the outlets relative to the TV it's almost impossible for them to not cross paths.

I'm stumped as to why this has only become a problem now when it was fine at first, and I'm also keen to hear if anyone has any advice? Is this normal? Can you buy baluns for aerial leads that might shield it from the interference from the power? 

Cheers

Steve

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787 posts

Ultimate Geek
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  Reply # 881800 20-Aug-2013 20:36
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I had the similar problem in my last house....only went all pixelated with tv1 and tv2.....i found that turning the tv off and then back on did the trick...but that was just me being super lazy




126 posts

Master Geek
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  Reply # 882195 21-Aug-2013 14:28
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I struck a similar one . Turned out to be the earth in the wall plate   it had gone very high resistance joint .
Replaced with F type   ( rear and front )  all cured

I have also struck those premade moulded plug accessory cables , One I struck  had poor earth .

I make a new one with high grade RG6 and good quality compression or crimp connectors

Some areas also have more than one set of DVBT channels   ( main and Infill )  make sure its gone to the correct set of 3 for your area if thats the case

something to check on anyway  

Steve

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Geek


  Reply # 882758 22-Aug-2013 13:36
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I too was having strange interference. I upgraded the cables between aerial and tv to RG6 with F connectors and added an Ftype/belling coax adapter to the end.

the RG6 has extra shielding, f connectors a better connection. I was also getting intermittent interference as my cables are a mess and tended to have plenty of power cables across.

Was $14 or so for a 1.5m cable from Jaycar. Give it a go, or make your own, and report back.

126 posts

Master Geek
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  Reply # 882771 22-Aug-2013 13:55
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I cut open one of those ( accessory ) premade cable with moulded Belling Lee ( PAL ) plugs that had failed ,
there was single layer of foil not overlapping and 2 strands only of very fine copper braid
so it went in the BIN

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