In an earlier contribution to this discussion,
mike wrote:


You don't tell us anything about your telly; is it a portable? Has it
only got one scart?

The TV with which I'm currently experimenting is indeed a Grundig
multi-standard portable with only one scart.

It sounds to me as if the STB, when powered, is grabbing the set via
scart switching - DVD players are a bugger for this, and other
devices can do it too, specially on rather crude one-scart
televisions, and you're seeing one progamme's syncs and another one's
video. I've had this with a Sony 14" portable and a Goodmans GDB4 STB.

You may well be right. The Grundig manual does refer to voltage switching on
Pin 8 of the scart. So what I'm seeing when trying to select a terrestrial
channel is probably actally a scrambled version of the digital channel to
which the STB is set.

For this type of setup, yes, what you're seeing is quite often normal.

IIRC it can be corrected, if disabling scart switching is not
available on the either telly or STB menu, by snipping a wire in the
scart lead.


Is it likely to be different if I connect it instead to my main TV - which
has 2 scarts?

As I may be wrong, and in any case I don't know your particular
units, I think you should repost on

uk.tech.digital-tv


As noted in your second post, I already have!
--
Cheers,
Roger
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