[R-390] Elephant Cages

Tue, 9 Dec 2003 06:00:44 -0700

I was in USAFSS in the late '60s/early '70s in Anchorage, Udorn, Thailand,
and San Vito, Italy, using the AN/FLR9-V antenna at all three locations in
CW intercept and RDF.  Thought you might like to learn a little more about
the "Elephant Cage" AKA "Dinosaur Cage" AKA "Flair 9".  Lotsa memories in
there from the Viet Nam era.  The stories we could tell....

http://www.fas.org/irp/program/collect/an-flr-9.htm

73s to ALL!!!

Don Kammer
KB0JTF

-----Original Message-----
From: Bob Tetrault [mailto:[email protected]] 
Sent: Tuesday, December 09, 2003 12:21 AM
To: Cecil Acuff; [email protected]
Subject: [R-390] Elephant Cages

Cecil,

The Elephant cages had enormously complicated (but so what? to Uncle Sam)
coax lead/lag phase switching tied to that circular array. They could be
steered just like a rotary beam and had accurate directivities of a degree
or so, besides being able to change beam angles nearly instantaneously. It
really didn't take dozens of receivers; just one, but it would take several
widely spaced arrays to triangulate a particular emitter. There's a brief
overview of these Wullenweber arrays in the ARRL handbook with some theory.
More to be found elsewhere should you care to Google.

Bob
Portland, OR

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