Roy Lewallen wrote:
I'm curious -- how did you determine from the SWR that the antenna
impedance would be resistive, and assuming it is, that it would be less
than 50 ohms rather than greater? Perhaps you've measured a Hamstick on
a typical mobile mount?

It's impossible to bring an impedance greater than 50
ohms down to 50 ohms by installing a shunt reactance
so the resonant feedpoint resistance of any mobile antenna
using a shunt reactance to achieve 50 ohms is, by definition,
less than 50 ohms.

if Rs = 50 and Xs 0 then Rp 50

Assume one can adjust the feedpoint impedance of a 40m
bugcatcher to 25+j25 or 25-j25 by adjusting the length
of the stinger. If one shunts 25+j25 with a -j50 cap,
the feedpoint impedance will be 50+j0 ohms. If one shunts
25-j25 with a +j50 coil, the feedpoint impedance will
be 50+j0 ohms.
--
73, Cecil http://www.qsl.net/w5dxp

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