For those keeping score, we have a new site online, McKinney (Site 10) and the database has again been updated faster than I can draft this post.
Did another road-trip survey this weekend, and it seems that the Dallas Hospital, Centennial-Frisco and McKinney are the only ones online so far. I did get a response out of Plano a couple of weeks ago (it was strong enough signal that I could pick it up from my 3rd floor apartment in North Frisco) so I know its site 11, but I haven't got any frequency data, and the site has been offline ever since.
The system does appear to be using rotating Control Channels and dynamic channel addressing (so no pinning down LCNs to make it usable). I have reverse calculated the band mapping, and can fairly reliably determine each channel assignment based on frequency.
My survey this week included, Plano, Irving, Coppell, Grapevine and Fort Worth. I was near Denton last week and didn't detect anything, so their rate of turning up sites is fairly slow at the moment.
Also, has anybody checked the Baylor sites in Austin? There's two licenses down there from about the same time for NXDN and they could be on the same system.
FCC Callsign WREX480 (Baylor Scott & White Health - Buda) (radioreference.com)
FCC Callsign WREX507 (Baylor Scott & White Health - Austin Oak Hill) (radioreference.com)