Thank you all for taking the time to reply. As this is all new to me, I really appreciate it As an update, I took the seller up on his offer to check the duplexer. The seller tested the duplexer and I was told the duplexer is tuned correctly. When the duplexer was sent back, I reinstalled the duplexer and made sure all the connections were correct. The repeater frequencies used are not active frequencies in this area. At this point, the repeater will work on occasion (repeater worked well with a very clean signal little over 4 miles out) and the later when I tried I just heard the repeater kurchunk (nothing is transmitted). Then, when I get about 1/8 mile from the house I can hit the repeater again. There is no real pattern when the repeater works and when it doesn't. I leave the repeater on (don't turn it off at night) and the repeater doesn't appear to be overheating. Do duplexers go bad and if so is what I am describing a symptom? If not, has anyone experienced anything similar? Any other ideas? Thanks again for you time!