Snowy pictures when TV aerial is through Sky

[ianm]

Hope someone can help with this problem which isn’t getting on my pip just yet but it will soon!

Have sky in the lounge downstairs and fed upstairs to 3 TVs via normal co-ax cable (via a booster). This means I can only watch the same programme on all (which is OK because I’ve got the remote!!!!). Sky pictures are tuned into the main TV and not via a scart. Worked no problem until the other day. The picture on the TV is snowy but the terrestial pictures are very good. Messed around with it for a bit to no avail and gave up simply because I was getting Sky+ the following day or so. I assumed it was the sky box and its co-ax aerial connector and as this box was going to be a multiroom box and not needed to be connected to the TV aerial I couldn’t be bothered fiddling for too long.

Anyway ……. The Sky+ box has just been fitted and the picture through the TV channel is still snowy and yet the other channels are ok (BBC and ITV etc both analogue and digitial). As I going to still use a co-ax connection to another TV I want to get it crystal (can you guess yet that its going to be for my use). Things I’ve done so far.
I put the Channel 5 gizmo back “in line” with TV aerial into the TV aerial Sky socket (I’ve no idea what it is or what it is called but somebody came and fitted it when C5 came online all those years ago). This was a bit loose so I resoldered the connection and it looked to be ok !!! Alas this didn’t work. I have made sure all the connections are good and swapped cables over and still the same. When I plug the TV aerial directly into the TV – great. When the TV aerial isn’t connected at all but the Sky+ box to the TV is then sky pictures are great – plug the aerial in and it snows – arghhhhhhhhhhhh

Scart connections are not affected and the picture on the TV downstairs is the same on the other, even down to the BBC etc.

I have got to check the booster by disconnecting it and going through the in – out process with the aerial but has anybody any suggestions?????

Please!!

IAN

Oh and apologies if there is already a thread on this somewhere but I couldn't find one

If yohu ignore the most obvious causes - low signal strength and poor quality cable/connectors then there is one likely cause.

What TV channel is the SKY box outputting? Many STB's output on channel 35 which is usually the same or very close to the Channel 5 signal.

If possible, change the output frequency from the Sky STB and leave at least three empty channels between the STB tuner and the last used TV analogue station in your area.