Topband: Impedance Bridges

[Joe Craig]

I built a small wheatstone bridge with a composition vairable resistor.
When the nul was reached, the resistor was put across a dmm via a DPDT 
switch.  I used this to prepare a plot of R vs Number of radials. 

The reactance was determined by tapping an inductor in series with the
tower for the best nul. 

It seemed to give resonable results although I seem to remember the
reactance also varied with the number of radials. 

Joe VO1NA