United Airlines Dulles Int'l New 800mhz Trunked System

mrrehab

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Freqs put it in public safety band? Wonder if they are going to give up dmr in the future? Wonder if MWAA and UAL might add a frequency or two for use in disasters?
Also guessing new system might be on hold for lack of money?
 

N1GAW

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Too far to listen for me, just throwing it out hoping someone can confirm and submit to database
 

GTR8000

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A couple of points:
  • 854-860 is not exclusive to public safety, rather is a mixture of public safety, business/industrial, and non-cellular SMR. They wouldn't have obtained a YB Business Trunked license in the band otherwise. 851-854 is the portion of the band exclusive to public safety (NPSPAC).
  • The emissions on the license indicate a DMR system, most likely Tier III or Capacity Max if they're building new, as Connect Plus is EOL.
  • The 900 band (935-940) is being reconfigured to create a broadband segment right in between two narrowband LMR segments, and so because some of United's frequencies at Dulles are impacted by that, they probably found it a better option to relocate to 800 MHz.
  • Moving to 800 MHz allows them the ability to operate on their trunked system, as well as have interop capability on 800 MHz analog channels (8CALL/TAC, as well as the two LCFR analog channels), using a single radio. Kenwood multi-protocol NX series radios are capable of both P25 and DMR, and so they could also have interop capability on the Loudon County ASTRO 25 system.
935.0-936.5 MHz - Narrowband LMR
936.5-939.5 MHz - Broadband
939.5-940.0 MHz - Narrowband LMR
 

dtscho

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It's also interesting that this 800 MHz DMR system is licensed for two four-frequency sites (the same two sites as the existing 900 MHz Connect Plus system). The four frequencies are the same for each site, which would indicate a simulcast system. I've never heard of simulcast on DMR, but I suppose it's possible...? Someone with more knowledge will have to comment.

Dave
 
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