Mychael Morohovich wrote:
The method I used was to first tune the antenna with my KAT100 for a
flat SWR, tune the counterpoise for max current at the rig, then tweak
both until the KAT100 reported a flat SWR for the antenna while the
Artificial Ground reported maximum current into the counterpoise. Using
the rf sensor, I measured the current of the antenna [and counterpoise
because I was curious] at a spot close to the back of the rig. I then
removed the counterpoise, retuned the antenna for a flat SWR, and
measured the current again for reasons of comparison.
This showed me the amount of current that was going into a properly
tuned antenna both with and without a tuned counterpoise in place.
Think of the antenna and everything connected to the ground terminal of the
KAT100 -- including the counterpoise -- as an off-center fed antenna. When you
removed the counterpoise, you moved the feedpoint. This changed the impedance
seen by the KAT100 (which is why you had to retune it) as well as the current
measured at the feedpoint. If (for example) the current at this point
decreased, how do you know it didn't increase somewhere else along the wire?
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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