Re: Dressing RG6

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Sujet : Re: Dressing RG6
De : jeroen (at) *nospam* nospam.please (Jeroen Belleman)
Groupes : sci.electronics.design
Date : 15. May 2024, 10:03:22
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <v21tl5$pcju$1@dont-email.me>
References : 1 2 3 4 5 6 7 8
User-Agent : Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0
On 5/15/24 01:33, Don wrote:
Jeroen Belleman wrote:
Phil Hobbs wrote:
John Larkin wrote:
Don wrote:
 <snip>
 
The parasitic capacitance created between coax and its metal armor can
open a Pandora's box of potential problems.
>
Capacitance between the coax outer and the copper pipe? Proper coax
shouldn't have any external field.
>
If the whole system is really coaxial, that’s true. Leaky shields, ground
loops, and so on, will modify that.
>
Depending on the application, you may or may not care.
If the whole system is really coaxial, that’s true. Leaky shields, ground
loops, and so on, will modify that.
>
Depending on the application, you may or may not care.
>
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.
 Empirical observation always trumps theory for me. Did you ground [1]
the copper tubes or braids?
Both ends were connected to the connector shields. The point of
the exercise was to reduce transfer impedance, which at low
frequency (<1MHz) is simply proportional to screen resistance.
Jeroen Belleman

Date Sujet#  Auteur
14 May 24 * Dressing RG631Don Y
14 May 24 +* Re: Dressing RG628Phil Hobbs
14 May 24 i`* Re: Dressing RG627Phil Hobbs
14 May 24 i `* Re: Dressing RG626Don
14 May 24 i  `* Re: Dressing RG625John Larkin
14 May 24 i   +* Re: Dressing RG623Phil Hobbs
15 May 24 i   i+* Re: Dressing RG619Jeroen Belleman
15 May 24 i   ii+* Re: Dressing RG613Don
15 May 24 i   iii+- Re: Dressing RG61John Larkin
15 May 24 i   iii`* Re: Dressing RG611Jeroen Belleman
15 May 24 i   iii `* Re: Dressing RG610John Larkin
15 May 24 i   iii  +* Re: Dressing RG62John Larkin
15 May 24 i   iii  i`- Re: Dressing RG61Jeroen Belleman
15 May 24 i   iii  `* Re: Dressing RG67Jeroen Belleman
16 May 24 i   iii   `* Re: Dressing RG66Phil Hobbs
18 May 24 i   iii    `* Re: Dressing RG65Jeroen Belleman
18 May 24 i   iii     `* Re: Dressing RG64Phil Hobbs
18 May 24 i   iii      +* Re: Dressing RG62John Larkin
18 May 24 i   iii      i`- Re: Dressing RG61Phil Hobbs
18 May 24 i   iii      `- Re: Dressing RG61Jeroen Belleman
15 May 24 i   ii+* Re: Dressing RG63Phil Hobbs
15 May 24 i   iii`* Re: Dressing RG62Jeroen Belleman
17 May 24 i   iii `- Re: Dressing RG61Don
15 May 24 i   ii+- Re: Dressing RG61Don Y
18 May 24 i   ii`- Re: Dressing RG61Bill Sloman
15 May 24 i   i`* Re: Dressing RG63John Larkin
15 May 24 i   i `* Re: Dressing RG62Phil Hobbs
15 May 24 i   i  `- Re: Dressing RG61John Larkin
15 May 24 i   `- Re: Dressing RG61Don
15 May 24 `* Re: Dressing RG62Clive Arthur
15 May 24  `- Re: Dressing RG61Don Y

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