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From: Alun Palmer
Subject: Re: How to check for a 50 or 75 ohm connector
Date: 23 Dec 2002 18:43:48 GMT
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"Brian Reay" wrote in
> "Alun Palmer" wrote in message
>> DarkMatter wrote in
>> You can't change the impedance and keep the same dimensions. If there
>> is a standard,
> Yes you can.
> With an air dielectric the formula for the impedance for a coaxial pair
> of conductors is:
> 138 log (D/d) where D is inside dia of outer and d is outside dia
> of inner.
> If there is a different dielectric the above formula is modified by a
> fact of
> 1 / (k ^1/2) where k is the dielectric constant of the insulator.
Well, yes, but they did have the same dielectric
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