axolotl wrote:

Glenn Ashmore wrote:

I tried building a stainless QFH antenna to pick up weather satellites but
the resistance is so much higher than copper that it turned out way off the
target 137 Mhz.

A change in resistance will not change the resonant frequency.
Resistance will affect the Q and bandwidth.

Kevin Gallimore




the resisatnce of the stainless is a pure resistance but it is in
parallel with the radiation resistance/ reactance causing a mismatch
with the transmission line with the associated standing waves. This
factor probably caused the off freq tuning since the transmission line
became resonant.

John