Problem with weired channel frequency offset (???)

[technetium]

I have some trouble getting my Plextor TV402U up and running properly with GB-PVR. The problem is to get a lock on the TV channels (the fault doesn't lie with GB-PVR, but maybe there's a workaround).

When I use the WinPVR software, that came with the Plextor, and invoking the autoscan function to find the channels ("North America" setting), all I get is ABC and UPN. After trying a lot of different things, I found out, that when I use another region setting in WinPVR ("Bahamas" - go figure) it allows me to manually fine tune the signal. And now I can click a preset channel (first getting noise only), take the manual tune slider down two notches and have a lock on the channel. This works consistently with all the channels (it's always the same direction and the same amount of manual correction I have to apply)!

So, I'm wondering where this frequency offset is coming from and more importantly how can I get GB-PVR to deal with it? Using an EPG (I signed up for zap2it) pretty much gives you preset fixed fequencies. Is there any way to manually adjust these? I should add, that I didn't sign up for any cable services, but just use what comes through the cable for free (which are a few basic channels; just enough for my needs).

Thanks!

[betlit]

instead of the channel number, you can enter the channels frequency directly in the capture source-config.

e.g. entering "567250000" means channel frequency 567.25 MHz.