I have just been given a sony vtx-s750u sky digibox and have got it up and running to a point. I can view all the channels on my main tv via the scart lead, but am unable to tune a second tv into the RF out-2. I've also tried using the rf out-1 with the same result : the picture is really weak / heavy snow. I've tried 2 tv's and both have the same weak picture - any ideas ?!? TIA Esky.