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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: Dressing RG6
Date: Sat, 18 May 2024 23:52:40 +1000
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On 15/05/2024 8:08 am, Jeroen Belleman wrote:
> On 5/14/24 23:46, Phil Hobbs wrote:
>> John Larkin <jjSNIPlarkin@highNONOlandtechnology.com> wrote:
>>> On Tue, 14 May 2024 19:22:12 -0000 (UTC), "Don" <g@crcomp.net> wrote:
>>>
>>>> Phil Hobbs wrote:
>>>>> Phil Hobbs wrote:
>>>>>> Don Y wrote:

<snip>

> I've been putting coax inside copper tubes or braids to measure
> and/or reduce the transfer impedance (leakage). I did that to
> measure small signals in a particle accelerator, which typically
> has kicker magnets and RF cavities with kA currents and kV
> voltages nearby.
> 
> A colleague developed a special low transfer impedance coax
> cable for this sort of application. It had two screens with
> intermediate magnetic shielding. It was unpleasant to work
> with, because part of the magnetic shielding was a steel
> spiral foil tape that was razor sharp. But it worked really
> well.

RG402 and RG405 semirigid coaxial cable has been around for ages.

https://www.awcwire.com/rg-catalog/rg402-coax-cable

With SMA soldered-on connectors it is good to 22GHz, and a solid copper 
tube as as a outer screen is pretty effective. Some people do have a 
passion for re-inventing the wheel.

-- 
Bill Sloman, Sydney