[TowerTalk] Coax loss. Has anybody measured it ?

Mike Fahmie via TowerTalk towertalk at contesting.com
Sat Nov 29 20:07:51 EST 2014

How about maybe in a underground nuclear test bore hole, it would deliver the signal before the coax melted entirely (?).-Mike-

      From: Jim Lux <jimlux at earthlink.net>
 To: towertalk at contesting.com 
 Sent: Saturday, November 29, 2014 4:37 PM
 Subject: Re: [TowerTalk] Coax loss. Has anybody measured it ?
On 11/29/14, 10:36 AM, David Robbins wrote:
> You want some lossy coax?  I have a couple old rolls where both the center
> conductor and shield are nichrome.  VERY lossy stuff!
What would they use nichrome coax for? Some sort of test jig for heating?

For use in a refractory or corrosive environment? I think I've seen 
hastelloy or something other superalloy.

I've seen stainless steel coax for cryogenic applications (very low 
thermal conductivity going in and out of a dewar), but it had a thin 
silver plating.  For microwave frequencies, the plating was thicker than 
skin depth.

I've also seen delay line coax, where the center conductor is a tight 
helix: the inductance/unit length is high so the propagation speed is 
slow (and the Z is high, too). That stuff was quite lossy, although not 
in a "dB/wavelength" sense.


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