I have a Panasonic HD680 (I think!) that has an absolute cracker of a picture (for VHS anyway) but has an annoying problem thatI would love to fix... When using RF to view and record, the picture is polluted with a moving herringbone pattern across it....at least it did until my friendly local dealer retuned (?) the output channel (HOW DID HE DO THIS - ITS NOT ON THE MENUS ??) to another, and replaced the herringbone effect with a horizontal flickering! SCART in and out recording and playback is fine.