[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
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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