Yes, use TSQL for TX and RX tone. I agree, use another channel, if one is available with no current use. I used to setup a receiver and a tape recorded for a week at time years ago to find conditions on certain channels that coordinators would send back as possible good ones for public safety and business. Not that any of them should have been used and undocumented, but just to check for skip, etc. I have done same on GMRS with a program called ScanRec for windows...which is essentially a Vox audio recorder. Find the cleanest one you can, and even if you don't use your repeater much, at least get on and do a radio test and ID a couple times a week, so if anyone else is doing what you are, they at least have a shot a knowing you exist. About all you can do with a self coordinated service.