Great info john! I am running into an issue on an install. I have an MSC-400 going into 4 RFX-250 Antennas. Cat 5 Extensions to 3 of them, 20-80 meters each. Two I am powering with 5V 300mA power supplies. Just to confirm the 5V is removed on both ends when a Power supply is present, but what about the ground? Should that be sent back to the MSC-400 as well as input from the local power supply? Having lots of issues with locking up, lost commands, etc. Any ideas are helpful.

Also in two of the rooms in this install, we also have a MRX-1 in each, with an external RFX-250. In both those rooms, I have another RFX-250 coming from the MSC-400. In a case like this is it possible or recommended to use one antenna for both the MRX-1 and the MSC-400? I am still working on an all nighter as I have to deliver this site Monday AM... Any help is appreciated.