Re: Dressing RG6

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