United Airlines at IAH
- Thread starter mwjones
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That's not United, but Aeronautical Radio "ARINC", likely the replacement for the iDEN system they used to have there (I actually carried an iDEN radio for that system for a time).
FCC Callsign WPXC586 (Aeronautical Radio Inc)
FCC Callsign WPXC586 (Aeronautical Radio Inc)
www.radioreference.com
Edit: Just found the system was recently added to RRDB:
n5pwp
Member
So I've been playing around with the DMR TIII system for United. It seems that they have completely changed all their TG numbers. What I'm seeing on DSD-FME are a bunch of Tgt IDs of 4204xxx. I have been trying to log all the numbers seen and am beginning to think they are not using TGs (even though DSD-FME does show that they are Group calls. They must have a crap-load of TGs now that they're on this system. Or, they're actually going ID to ID and not using groups.
Mike
Mike
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n5pwp
Member
I take it no one has come up with the actual channel mapping for United Site 1-14? I have been trying to play wack-a-mole watching the streams as they pop up on the waterfall and match them up to the LCN that DSD-FME shows as active. I'm getting nowhere. I even tried the DMR TIII LCN calculator. But, I don't know if my observations are correct for the Ref Freq/ Ref LCN. So garbage in == garbage out.
Mike
Mike
Whatever it is, it's a mess - even looking at the Chicago site in RRDB the channel mapping makes no sense.
Typically, you have a single mapping plan across all sites, but since they're in UHF/T-Band/800Mhz/900Mhz they have distinct ones for each, so it's likely going to take some patience to find the first frequency-LCN combination, and then the rest can be calculated (Chicago is 12.5 KHz spacing in the frequency calculator, so I would think IAH would be the same).
The way I solve it is I use a SDS100 (with the DMR add-on), with all the frequencies loaded as conventional, and will start scanning them, but watching the control channel with DSD. When the scanner stops scanning on an active channel, note the LSN DSD is reporting. Rinse and repeat. Get a couple of LSN pairs and then go to town mapping the rest with the calculator. Depending on the level of activity (and if the administrators have it set to round-robin the channels, vs using a specific channel order with one taking the brunt of the load), it can take minutes, or it can take days.
n5pwp
Member
No kidding. Thanks to Eric for entering the frequencies. I was able to get the channel mapping worked out here. It seems to be working on my SDRpp/DSD-FME setup.
I did my Whack-A-Mole thing and got 3 of the 4 frequencies other than the CC. I plugged one of the channel/frequency pairs into the reference section of the DMR TIII Calculator and got all 4 matched up.
This is my channel mapping:
ChannelNumber(dec) frequency(Hz) (do not delete this line or won't import properly) ,
999,936900000
174,937162500
213,937650000
215,937675000
233,937900000
I'm still getting calls from the 1-14 CC for channels that don't have frequencies in the table. I'm going to see if the 1-13 frequencies match. Although I don't see any voice streams for the 1-13 site. I did find the CC but I haven't seen much activity on its frequencies.
Mike
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