Path: ...!feeds.phibee-telecom.net!3.eu.feeder.erje.net!feeder.erje.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: "Don" Newsgroups: sci.electronics.design Subject: Re: Dressing RG6 Date: Tue, 14 May 2024 22:20:56 -0000 (UTC) Organization: A noiseless patient Spider Lines: 45 Message-ID: <20240514c@crcomp.net> References: <20240514b@crcomp.net> <66h74j1vfmbjvvl98jk1k017pimtinv2l5@4ax.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Injection-Date: Wed, 15 May 2024 00:20:57 +0200 (CEST) Injection-Info: dont-email.me; posting-host="6e29ef8df1bc4f71017b58328b955bc5"; logging-data="460279"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/iRleUnW5nIeomNDX2ZJVc" Cancel-Lock: sha1:/XXUqS08J4seUbHYkuR+hRyDSnY= Bytes: 2617 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 ... 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.