re: Durham Region simplex channels
I also noticed the 851.300 freq had activity lately that sounded like iDEN buzzing away.
This signal was very strong near the lake, so I looked it up on both TAFL and FCC databases.
Only Durham listed on TAFL.
Looked on FCC.gov site and bingo, there you have it...licenced to NEXTEL in Monroe County and Erie county New York across the lake from us. That is why it sounds like iDEN, because they are the same type of system.Since rebanding started in the U.S. there have been some changes to frequency use in the 800Mhz public safety band
I have heard sparse activity on the Durham licenced simplex freqs but the are definitely analog,
usually used for fireground comms in ie: large industrial area fires, or if units can't reach each other via the trunk system,