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  #61 (permalink)  
Old 07-25-2014, 4:31 PM
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Since I'm on the technical side of the FAA I don't rely on or use any files from the NFDC with the exception of charts and the Green books or Dod Supplement when I have to go out and resolve a RFI issue. So I can't vouch on the file's accuracy. I DO know that on the technical side of the FAA we are continuously reviewing and reusing frequency assignments.
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Old 07-25-2014, 9:52 PM
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I just checked the AFF for the ZDC Falls Church sector. All kinds of wrong.

Shows
RCAG 126.875 HIGH
RCAG 132.775 HIGH
RCAG 133.97 HIGH
RCAG 135.525 HIGH
RCAG 351.8 HIGH
RCAG 357.6 HIGH
RCAG 381.5 HIGH

285.45 has replaced 327.0. Found this a few months ago, maybe changed early this year. 126.875 is the VHF side and still in use.

307.025 <133.975> replaced 381.50 sometime prior to March 2006

351.80 <132.775> Was in use in May 2005. In November 2005 Langley fighters would report no contact on 351.8 when handed off. 132.775 was changed to the ADIZ east sector freq years ago. The pair was probably never replaced.
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Old 07-26-2014, 2:27 PM
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Quote:
I just checked the AFF for the ZDC Falls Church sector. All kinds of wrong.
RCAG 135.525 HIGH
135.525 is not a HIGH frequency either. The RR database shows it as "ZDC Guard Dog Low (Shared w/Potomac TRACON) " transmitting from Leesburg.

I'm not that familiar with ZDC low and Potomac approach airspace in that area and don't see it listed on any chart. Anyone know what they use 135.525 "Guard Dog Low" for ?
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Old 07-26-2014, 3:07 PM
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Whenever el Prez goes to Camp David, we have a Combat Air Patrol (CAP) over that area. That frequency is one of two - the other, if memory serves, is 350.25 - that is used for coordination purposes with ZDC.

When not used for a CAP, the last time I listened to it on a regular basis, it's used when Falls Church is exceptionally busy, like during a rush hour on the ground

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Old 07-26-2014, 3:17 PM
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Quote:
Whenever el Prez goes to Camp David, we have a Combat Air Patrol (CAP) over that area. That frequency is one of two - the other, if memory serves, is 350.25 - that is used for coordination purposes.
Thanks for the info.
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Old 07-26-2014, 4:02 PM
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350.25/135.525 is TRACON not ZDC. But does cover up to the FL240 or whatever they happen to be using for the CAP.
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Old 05-14-2017, 3:37 PM
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Quote:
Originally Posted by profiledescent View Post
Rogers,I believe was upgraded to ARSR IIE, and is fed to both Houston and Ft. Worth ARTCCs.
Azel is an ASR-9. It serves DFW and Ft. Worth Center.
Anson is Secondary (SSR Beacon) only. it serves Ft. Worth ARTCC.
Sachse is an ASR-9 and serves DFW and Ft. Worth ARTCC.
Afton is a Secondary (SSR Beacon only) site fed to Kansas City, Memphis, and Ft. Worth ARTCCs.
Keller is an ARSR IIE, and serves Ft. Worth Center.
Although the above thread is old, I thought I would insert that the ARSR-2 have been upgraded to CARSR. Note that CARSR is NOT an ARSR-3 (nor is it a ARSR-4). CARSR and ARSR-4 are now the long range radars for ARTCC and air defense. Those still in the 1.240-1.370 GHz range, with 2 frequencies for ARSR-4 and 2 frequency pairs (4 frequencies, but the 2 per pair are only about 5 MHz apart) for CARSR. The rotation time remains 12 s (5 rpm). When close, due to signal strength, one can often see the signal continuously and not perceive the rotation.

Airport radar generally are ASR-9 or ASR-11 and can be found in the 2.7 to 3 GHz range if one wants to "hear" them. The ASR-9 use 1 frequency, while the ASR-11 use 2 frequencies (one of the ways to tell them apart). These are 4.8 s scan (12 rpm).

Air navigation radar TDWR (Terminal Doppler Weather Radar) located near (but usually not at the airport) for larger airports uses 5.6-5.65 GHz.

The surface detection radars for airport ground (where installed) use 9.0-9.2 GHz (ASDE-X, 4 frequencies) or 15.7-16.2 GHZ (ASDE-3, 16 frequencies). I have personally no experience with those other than seeing the rotating enclosure often atop an airport tower.

NWS weather radar (NEXRAD) operates in the same band as the ASR-9 and ASR-11 (2.7-3 GHz). these have a 6 minute repeat period of different modes on one frequency.

Both TDWR and NEXRAD (WSR-88D) are in radomes (smaller than those for the CARSR and ARSR-4).
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