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Groups > sci.electronics.design > #431389
| From | amdx <nojunk@knology.net> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: Need clarification on RF related concepts |
| Date | 2016-10-16 04:37 -0500 |
| Organization | A noiseless patient Spider |
| Message-ID | <ntvhp5$2rs$1@dont-email.me> (permalink) |
| References | <c156ae15-c4bf-458f-8d1c-d3780a0f14ad@googlegroups.com> |
On 10/16/2016 1:44 AM, dakupoto@gmail.com wrote:
> Could some electronics guru please help ?
> I am a bit rusty on some RF concepts so I
> request some clarifications from the gurus
> here.
>
> By definition, a 4:1 balun has 4 times
> the impedance on the balamced side as the
> unbalanced side. For any inductor, the
> impedance is based on the reactance, which
> in turn is based on the frequency of
> operation.
>
> So, what frequency is being considered
> here ? The reason I ask is that a balun
> could be used as broadband impedance
> matching device. Thanks in advance for
> your help.
>
It is my understanding that a balun is a transformer.
In order for a transformer to transform properly it needs to have
at least 4 times the inductive reactance of the impedance it is
transforming.
Example: The primary of a 50 ohm transformer must have at least 200 ohms
of reactance at the lowest frequency of operation. As you go lower
in frequency. at some point the reactance becomes less than 200 ohms and
the transformer starts to become less ideal in transforming
the impedances.
So build your balun with enough impeadance to cover your lowest
frequency and it will be broadband, (up to a point).
Mikek
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Need clarification on RF related concepts dakupoto@gmail.com - 2016-10-15 23:44 -0700
Re: Need clarification on RF related concepts amdx <nojunk@knology.net> - 2016-10-16 04:37 -0500
Re: Need clarification on RF related concepts Phil Allison <pallison49@gmail.com> - 2016-10-16 05:14 -0700
Re: Need clarification on RF related concepts amdx <nojunk@knology.net> - 2016-10-16 08:04 -0500
Re: Need clarification on RF related concepts Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2016-10-16 17:36 +0300
Re: Need clarification on RF related concepts dakupoto@gmail.com - 2016-10-16 23:27 -0700
Re: Need clarification on RF related concepts amdx <nojunk@knology.net> - 2016-10-18 08:44 -0500
Re: Need clarification on RF related concepts Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2016-10-18 11:06 -0400
Re: Need clarification on RF related concepts "Michael A. Terrell" <mike.terrell@earthlink.net> - 2016-11-07 13:38 -0500
Re: Need clarification on RF related concepts George Herold <gherold@teachspin.com> - 2016-11-07 11:00 -0800
Re: Need clarification on RF related concepts "Michael A. Terrell" <mike.terrell@earthlink.net> - 2016-11-09 18:35 -0500
Re: Need clarification on RF related concepts Jeff Liebermann <jeffl@cruzio.com> - 2016-11-09 19:59 -0800
Re: Need clarification on RF related concepts "Michael A. Terrell" <mike.terrell@earthlink.net> - 2016-11-12 08:46 -0500
Re: Need clarification on RF related concepts "nuny@bid.nes" <Alien8752@gmail.com> - 2016-11-07 11:09 -0800
Re: Need clarification on RF related concepts "Michael A. Terrell" <mike.terrell@earthlink.net> - 2016-11-09 18:22 -0500
Re: Need clarification on RF related concepts Tim Wescott <tim@seemywebsite.really> - 2016-10-16 14:28 -0500
Re: Need clarification on RF related concepts rickman <gnuarm@gmail.com> - 2016-10-17 04:04 -0400
Re: Need clarification on RF related concepts "Tim Williams" <tiwill@seventransistorlabs.com> - 2016-10-18 07:00 -0500
Re: Need clarification on RF related concepts Jeroen Belleman <jeroen@nospam.please> - 2016-10-18 16:45 +0200
Re: Need clarification on RF related concepts Jasen Betts <jasen@xnet.co.nz> - 2016-10-17 09:43 +0000
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