Problem solved, it seems that the dm800 is very sensetive what switch you are using, a tried several cheap ones but NONE worked ok.
I can just guess what the problem is, i think dm800 can't deliver enough power to the switch.

spaun SAR 212 F works perfectly, it seem that this one requires less power to run. http://www.satpro.se/default.asp?id=10801

I have 2 LNB with a 2 to 1 diseq switch, DM800 will not switch every time a change channel. Before i had a DM7020 on the same swich and lnb with no problem. I have tried the following change the diseq to a modell with 4 to 1 and the the switching start working.

Is there any know problem with the diseq swicthing and DM800.

/ Jonas, Sweden