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From: "Don" <g@crcomp.net>
Newsgroups: sci.electronics.design
Subject: Re: Dressing RG6
Date: Tue, 14 May 2024 22:20:56 -0000 (UTC)
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John Larkin wrote:
>Don wrote:
>>Phil Hobbs wrote:
>>> Phil Hobbs wrote:
>>>> Don Y wrote:
>>>>> I've several short (a few feet) lengths of RG6 that I
>>>>> would like to "strongly coerce" into assuming a particular
>>>>> dressing.
>>>>>
>>>>> Securing the cables to a stationary surface isn't practical
>>>>> without significantly lengthening them and distorting
>>>>> their "natural" routing.
>>>>>
>>>>> But, ISTM that I should be able to slip each cable into
>>>>> a comparable diameter copper (?) pipe and then use traditional
>>>>> tools to bend that pipe into the appropriate configuration.
>>>>> I'd have to observe constraints like minimum bend radius
>>>>> but are there other issues that I might "discover" down the
>>>>> road?
>>>>
>>>> You?re planning to make a random- length shotgun balun.
>>>
>>> Bazooka balun.
>>
>>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.

Does a ferrite bead by any other name (eg metal armor) contain parasitic
capacitance?

    ... A ferrite bead can be modeled as a simplified circuit
    consisting of resistors, an inductor, and a capacitor ...

    <https://www.analog.com/en/resources/analog-dialogue/articles/ferrite-beads-demystified.html>

Danke,

-- 
Don, KB7RPU, https://www.qsl.net/kb7rpu
There was a young lady named Bright Whose speed was far faster than light;
She set out one day In a relative way And returned on the previous night.