Ok I have a strange problem & have been waiting to post until I checked it out all the way. I have three of the Openbox S-9 machines. I am using them on AMc-3 C-Band for the rtv channels. Only one of them will pull all of the T/P's..ie the 3800's and the 4080's getting all the channels that are active. The other two only get the stronger ones at 4080. I can hook up any of the receivers at any of the lines coming from the switch which is a DP-34 and no matter where they are connected the same problems happens. The signal strength and quality are great on all channels on the one rec but are not enough to pop channels on the weaker (3800) on the other two. I have peaked the antenna out as far as possible without have a highend meter. Sure would like to know that answer to my strange problem. How could the one rec do what the other two won't ?