Re: K3 SWR Accuracy - reprise

Posted by Eric Swartz - WA6HHQ on Nov 04, 2009; 11:13pm
URL: http://elecraft.85.s1.nabble.com/K3-SWR-Accuracy-reprise-tp3943810p3949014.html

That assumes there is no RF on the exterior of the coax and the SWR
sensors are ideal. Neither is the case and from personal experience I
can tell you that the swr meters will change readings based on coax length.

73, Eric


Phil & Debbie Salas wrote:

> "How long is the coax between the LP100 sensor and the K3? This can have
> a significant impedance transformation impact as you go to higher
> frequencies, leading to a different indicated SWR at each end."
>
> The impedance changes, but not the SWR.  Looking at this on a Smith Chart,
> you can see that you just rotate around a constant SWR circle.  Minus coax
> losses of course, which are negligable when we're talking a few feet at HF.
>
> Phil - AD5X
>
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