These are the scan results (parser out of TVService.log):
Note the 'quality:0' for the 746000, 754000 and 634000 kHz frequencies (com7, com8 and loc1 muxes).
So basically, for those frequencies, the tuner is saying it's locked on to the frequency, but the digital stream is rubbish... (the 'locked' 'signal' and 'quality' info comes from the tuner drivers, as far as I know).
That said, the 'signal:100' for those frequencies seems suspicious - could there be interference from something in the PC maybe (which the tuner is picking up instead of the real off-air signal)?
When I do an all regions scan the results for the frequencies where there is no signal is that same as these i.e. signal strength 100 quality 0
I'm thinking that the signal just isn't good enough.
I have in a loft aerial which isn't ideal
Looks like I need to find an installer :-(