[TowerTalk] name that antenna

[Jim Jarvis]

The FAA and other countries aviation agencies still
maintains contact with trans-oceanic flights via HF.

For the transatlantic traffic, it's Gander NF, and 
Shannon EI which are the comm centers.  They have similar 
lpda's to those found in Nashua NH and Leesburg VA.
I've also heard New York Center on the 8Megs freq, but I 
haven't seen that site.    

If you go to Antigua, you'll see an array of LPDA's, of a
different design.  They use 3 structural elements, deployed
at 120 degree increments around the central structure.  The
forward one is longer than the two 'back' ones....and the 
dipoles are strung between catenary wires which extend between
the three 'booms'.  This structure can be balanced for physical 
mass and windload.  

I doubt that the FAA used the HF facilities for backhaul 
between centers.  The radar info is too intense and too
frequently updated to be supported by available HF bandwidth.
Rather, I believe those sites are legacy/backups for the
HF trans oceanic traffic.  


V25EA, N2EA


Jim Jarvis, President
The Morse Group, LLC
732 548 5573 office
www.themorsegroup.net
results at themorsegroup.net

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