Recently I had an issue with another repeater using the same pair as mine. This repeater was unknown to anyone in our area (not listed here or on Repeaterbook). Another operator was located between my site and the other site, and he could communicate clearly with me and the other repeater owner. I could only catch part of the distant repeater output. The distant machine was using 136.5 and I use 141.3. Is the fact that these PL Tones are so close to each other explain why each repeater was receiving the other's output (at low levels)?