Re: [linux-media] stb0899: no lock on dvb-s2 transponders in SCR environment

[Klaus Schmidinger <Klaus.Schmidinger@tvdr.de>]

On 27.04.2013 14:14, Reinhard Nissl wrote:
> Hi,
>
> my stb0899 card works properly on dvb-s and dvb-s2 transponders when using a direct port on my sat multiswitch.
>
> When using a SCR port on that multiswitch and changing VDR's config files accordingly, it only locks on dvb-s transponders.
>
> A SCR converts the selected transponder's frequency after the LNB (IF1) to a fixed frequency (for example 1076 MHz) by mixing the signal with a local oscialator frequency above IF1 so that the lower sideband of the mixing product appears at 1076 MHz.
>
> The lower sideband's spectrum is mirrored compared to the upper sideband, which is identical to the original spectrum on the original IF1.
>
> Could that be the reason why the stb0899 cannot lock on dvb-s2 transponders in an SCR environment?
>
> Any ideas on how to get a lock on dvb-s2 transponders?

Just wanted to let you know that I can confirm the problem with
the stb0899. On my TT S2-6400 I can receive DVB-S and DVB-S2 just
fine with SCR. During development of SCR support for VDR I guess
I did all tests with the 6400, so I didn't come across this problem.
However, as a reaction to your posting I explicitly tested it with
my budget cards, and there I indeed can only tune to DVB-S transponders.

No idea how to solve this, though...

Klaus