1. You use your existing analog or 4dtv receiver to move the dish, change polarity and adjust the skew as needed. Once the dish is moved then hit the tv/sat button and switch over to the DVB receiver remote to select the DVB channel.
2. I guess that is up to you. I have not heard anyone complain about too much loss going through a
diseqc switch though. Another option is a 22 khz tone switch. Every switch will have some loss. A poor quality A/B switch can be very lossy.
3. Yes you need DC pass on one side of each splitter. Put the coax from the 4Dtv on the DC pass side to power the lnb.
I have a Pansat 2300A. Overall works good but I have found some bugs. On channels with different audio feeds on L and R the L/R mode change in the receiver does not work at all. On the Sat list to switch the channel list to only include channels from the sat you are on currently, once the window fills it does not start to scroll. You can still cursor down and select a different sat, but I'm not sure what will happen if you add enough sats that they no longer fit on the TV screen. I'm totally unimpressed with Pansat's response to my questions regarding this. They did not tell me why this is happening and would not say if this has been fixed in the latest software upgrade. I would probably suggest a Fortec instead.