TBS 6980 Connection With LNA

[zia]

Hi, I have TBS 6980 card, I want to connect it in following scenerio:

Satellite Dish --> LNA --> Down Convertor ( C to L band) --> DC Blocker --> TBS-6980 --> DVB Dream App

I connected in above scenerio but could not lock the channels. I adjusted the LO frequency in DVB Dream software
according to Down converter but same results.

I could not undrstand the reason why TBS card is not working in above scenerio.

Thanks for your anticipation.

Thanks,
Zia