Exotic coax ?
 

If you don't suceed try again. Sorry for the repost but my previous post
drew nothing useful. Is this site getting like the rest of the Internet?

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?
tnx
--

73
Hank WD5JFR

Try a Google search for 204-15578-1. I got one hit. Also look for
68999 in the pdf file at
http://www.timesmicrowave.com/content/pdf/tl14/28.pdf, and do a Google
search on '68999 coax'. Things like that might get you somewhere...or
might be dead ends.

Also, measure the impedance. The size will give you a good indication
of the loss, or just measure it.

Cheers,
Tom

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
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

On Tue, 19 Jul 2005 18:18:18 GMT, "Henry Kolesnik"
wrote:

If you don't suceed try again. Sorry for the repost but my previous post
drew nothing useful. Is this site getting like the rest of the Internet?

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?
tnx

I'd go to the Wireman's web site, and just call them on the phone.
They seem to know everything there is to know about coax.

bob
k5qwg

Be on the lookout for any dark sedans with two men inside
wearing dark sunglasses.

This email has been sent from a dead drop to protect me from
the above referenced individuals.


Henry Kolesnik wrote:

If you don't suceed try again. Sorry for the repost but my previous post
drew nothing useful. Is this site getting like the rest of the Internet?

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?
tnx
--

73
Hank WD5JFR

I called Times Microwave and got a spec sheet by email. It is exotic, 50
ohm high temp good to 200 deg. C. Attenuation is .55dB/100' @10 MHz and 5.8
dB @ 1 GHz. Double shield and center conductor are all silver covered,
dielec is Teflon and outer jacket is fluorinated ethylene propylene.
Operating voltage is 7KVRMS & strength is 12 KVRMS. VP is 76%. Neat stuff,
made special for Boeing. Thanks to all who helped

73
Hank WD5JFR
"Henry Kolesnik" wrote in message
. ..
If you don't suceed try again. Sorry for the repost but my previous post
drew nothing useful. Is this site getting like the rest of the Internet?

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?
tnx
--

73
Hank WD5JFR