[TowerTalk] cushcraft D40 resonant too high

[Ed Sawyer]

Ted, 

 

The SWR at your radio is a function of the antenna AND the feed line.  Don't
assume the antenna is the problem.  If you can measure the antenna at a
known half wavelength transmission line point, you will know for certainty
if the issue is "at the antenna" (which could also include the connection to
the antenna).

 

I now make it a practice to have a known tap point on the ground for all of
my tower mounted antennas. 

 

My experience with trapped dipoles is that if the trap goes - the matched
SWR point shifts way more than 300khz on a 40M antenna.

 

Ed  N1UR