On Wed, 17 Sep 2008, Bill W5WVO wrote:
Actually, looking at transmission line SWR at the transmitter is a
poor way to adjust an antenna. To get it right, you need to use a
complex impedance analyzer like the now-ubiquitous MFJ-259B (or
equivalant instrument), and put it as close to the antenna
feedpoint as possible. Adjust as close as you can get for Xc=0,
Xl=0, R=50. You can't do that with an SWR bridge! :-)
Alternately, feeding through one or more half-waves of coax will give
you good accuracy while letting you get far enough away from the antenna
to not affect the measurement.
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