Site 87.87 mystery solved - as I suspected it is DFW.
I had the day off work today and went to Founder's Plaza, and I could just barely pick up the control channel - I could see it on the DSDPlus "scope" but it was too weak to decode, so a quick trip down the service road to a turnaround and back North saw the signal pegged the scope as I approached the above shelter with Yagi's.
Now, this presents an interesting result - As you'll notice the CC is listed twice, and both one of the CC entries and the SCC entry has a "-1" behind the frequency. I had to pull the logs to confirm and compare with a log I captured last year in Oklahoma.
This site is using a Phase II (TDMA) control channel - Harris is the only vendor to currently support it on the hardware side, and there's no scanner on the market today that can decode it - and even in SDR receivers, only a few pieces of software can decode it (in my case DSDPlus.) Phase II control channels are still pretty rare (the only other time I've seen it is on American Electric Power's system up in Oklahoma and North-East Texas - which is why I had to go look at the old logs), so this is a first for the D/FW area.
There are only two frequencies on the 700MHz band licensed at the airport site, compared to the 5 800MHz frequencies - so going to a TDMA control channel gives them 3 concurrent TDMA Voice talkpaths, or 1 CDMA Data talkpath concurrent with 1 Voice talkpath on the 700MHz band, further increasing efficiency of the system.
Now to go and write the submission that hopefully makes sense to the RRDB admins.
I had the day off work today and went to Founder's Plaza, and I could just barely pick up the control channel - I could see it on the DSDPlus "scope" but it was too weak to decode, so a quick trip down the service road to a turnaround and back North saw the signal pegged the scope as I approached the above shelter with Yagi's.
Code:
Site: 87.87 NAC=057 ; DFW Airport 700MHz
Neighbor: 46F74.0D6-50.50 ; North Simulcast 700MHz
Neighbor: 46F74.0D6-60.60 ; North Simulcast
Neighbor: 46F74.0D6-70.70 ; South Simulcast 700MHz
Neighbor: 46F74.0D6-78.78 ; Downtown-South Simulcast
Neighbor: 46F74.0D6-89.89 ; DFW Airport
Neighbor: 46F74.0D6-91.91 ; Mockingbird Tunnel 700MHz
Neighbor: 46F74.0D6-93.93 ; Mockingbird Tunnel
Neighbor: 46F74.0D6-95.95 ; Hurst
Channel 9-860: 771.69375-1 SCC
Channel 1-824: 774.15625 CC
Channel 9-1648: 774.15625-1 CCNow, this presents an interesting result - As you'll notice the CC is listed twice, and both one of the CC entries and the SCC entry has a "-1" behind the frequency. I had to pull the logs to confirm and compare with a log I captured last year in Oklahoma.
This site is using a Phase II (TDMA) control channel - Harris is the only vendor to currently support it on the hardware side, and there's no scanner on the market today that can decode it - and even in SDR receivers, only a few pieces of software can decode it (in my case DSDPlus.) Phase II control channels are still pretty rare (the only other time I've seen it is on American Electric Power's system up in Oklahoma and North-East Texas - which is why I had to go look at the old logs), so this is a first for the D/FW area.
There are only two frequencies on the 700MHz band licensed at the airport site, compared to the 5 800MHz frequencies - so going to a TDMA control channel gives them 3 concurrent TDMA Voice talkpaths, or 1 CDMA Data talkpath concurrent with 1 Voice talkpath on the 700MHz band, further increasing efficiency of the system.
Now to go and write the submission that hopefully makes sense to the RRDB admins.
