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wrote:

Ok I tried doing what you suggested I took another portable downstairs
and tried rigging that up with a different cable to the RF Out still
the same. Also using that same cable ran it to the main tv after
disconnecting the scart same again (Good analogue, grainy sat)
I dont think its the cable seems to be getting same results with 2 made
up cables and an RF flylead, and its not the TV must be the channel its
tuned to which i think is 68.

One thing that would cause this is if there's a digital terrestrial
(DTT) transmission on ch. 68 (or whatever channel the modulator in your
digibox is set to). This will have gone unnoticed if the $ky feed to
your main TV uses SCART. An interfering DTT signal looks like noise to
an analogue signal so it will make the remodulated $ky output look noisy
(snowy). For a quick check unplug the UHF aerial feed into the digibox.
Obviously you will loose the off-air signals on the remote TV, but
if the $ky signal improves dramatically then the cause is confirmed.

The permanent solution is then to set the digibox output to another
channel (and retune the remote TV). It would help to know which
terrestrial TV transmitter serves your area, or where you live (postcode
sector would suffice).

--
Andy