In article ,
Henry Kolesnik wrote:

At the OKC hamfest I got a piece of neat looking coax that is double
shielded with silver braid, with a sort of clear pink outer sheat. It has
connectors so I don't know the thickness of the center conductor but the
seller said it was 50 ohm.
It's stamped with the following characters:
68999, AA-2831. 81205, 204-15578-1, AUGUST 1996

I asked the seller, an ex-Boeing employee about it and he said it's the same
kind as used in Air Force One. He couldn't recall the specs but said it was
Teflon, good to a Gig but he had used it outdoors. for 2 meters and 440.

Can anyone tell me more or point me to a site?

Hmmm. I wonder whether this might not be Times Microwave 68999, a
mil-spec hermetically sealed .34" coax. Silver-plated copper-clad
aluminum center conductor, taped PFTE (Teflon) dielectric, triple
shield (silver-plated copper strip, aluminum-backed tape,
silver-plated copper braid), FEP (Teflon) inner jacket, Nomex outer
jacket. 50 ohms, rated to 18 GHz.

Definitely exotic stuff, intended for applications where long-term
reliability is extremely important.

http://www.timesmicrowave.com/content/pdf/MT340E-B.pdf

--
Dave Platt AE6EO
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