Wireless microphones. Did you try to listen in various modes like FM, FMN, wide FM, etc modes or just in AM? I thought I was receiving satellite communications last year and there were three different frequencies right in that same frequency range you're talking about I found active over a period of about a month. I researched the frequency (or really frequencies) and realized there are manufacturers that have wireless microphones in that frequency range and on those frequencies I was picking up traffic on. It took a little time to find what I was looking for but eventually I had the manufacturer of the microphone and other frequencies they used also. Now I don't remember who they were or what some of the other frequencies might have been.
In my case, it turned out to be a church that was practicing on Saturday nights for the songs and other presentations they were going to do on Sunday morning. It sounded like a youth director and maybe some younger people. He was real loud and clear and anybody close to him would come in a lot clearer. But some of the conversation I really couldn't hear because it was too far away from what I'm guessing was a lapel mic.
I don't recall hearing any DTMF tones. If you were unable to hear what was being said clearly, I guess it could be a WBFM phone patch? I used to hear a lot of those and they still occur but I don't think they can be tuned in quite as easily as they used to with LSB and USB. I've been able to tune in phone patches with AF1 and a lot of the NIGHTWATCH guys in years gone by. But I will occasionally hear one of the wideband carriers and I can hear the DTMF tones even though it sounds like the bandwidth on the AM signal is not wide enough for things to come through clearly. I'm not sure how they go about doing it nowadays but I think it's a lot more unusual to be able to tune in the traffic nowadays like we could do even 15 years ago.
Brian (COMMSCAN)