Re: KAT 500 and open wire

Posted by David Woolley (E.L) on Jan 06, 2019; 11:51pm
URL: http://elecraft.85.s1.nabble.com/KAT-500-and-open-wire-tp7647776p7647796.html


The feedpoint impedance DOES depend on the characteristic impedance!

Taking pure resistive cases (real characteristic impedances aren't), and
lossless lines, a 75 ohm load at the end of a 75 ohm transmission line
will have a feed point impedance that is a constant 75 ohms, whereas a
75 ohm load on 300 ohm feeder will have a feed point impedance that
swings from 75 to 1200 ohms.

--
David Woolley
Owner K2 06123

On 06/01/2019 21:40, Don Wilhelm wrote:
> The feedpoint impedance to the transmission line can vary from quite low
> to quite high dependent on the frequency, the length of line, and the
> load at the far end.  It does NOT depend on the characteristic impedance
> of the transmission line.



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