While the topic of tone remotes came up, I have a question about configuration.
I help to maintain a remote base system in my town. The radio is a Motorola DeskTrac remote base. Connected to this are three CPI TR-10 tone remotes. One of the tone remotes is at the Desktrac location, and the other two are on two separate cable pairs to different locations. I'm not quite sure as to how the three circuits should connect together. CPI documents state that one should be in the 600 ohm terminated mode and the other two in the 5000 ohm mode, but this is when the three are on the same phone line. This does not work well, so I had to put them all in the 600 ohm mode to make them work properly with no ground hums. What I would like to do is put 600:600 ohm isolation transformers on each of the remote circuits to isolate them and hopefully eliminate the little ground hum I still have. I'm wondering if there is a better way. Joe
