Mark,

Ask Weatronic, they have a superb service and they answer to all questions (in particular Mr. Gerhard Paasche from Weatronic-USA is extremely helpful).
They also have their own Weatronic Support Forum here on RCU : http://www.rcuniverse.com/forum/forumid_482/tt.htm

But, in my opinion, it is logical what they will tell you....

BTW : fantastic equipment, it's a one-unit total system too. I wouldn't hesitate myself to buy this again if I would ever need one.

Nicolas.