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From: Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>
Newsgroups: sci.electronics.design
Subject: Re: Dressing RG6
Date: Tue, 14 May 2024 21:46:35 -0000 (UTC)
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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:
>>>>> 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.
>> 
>> Danke,
> 
> 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. 

Cheers 

Phil Hobbs 

-- 
Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /
Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics