Posted by
K. Rice on
May 14, 2006; 10:51pm
URL: http://elecraft.85.s1.nabble.com/Antenna-Feedline-Question-tp389612p389614.html
You've gotten plenty of good advice, and one of the best pieces of advice
was Don's suggestion to make the antenna a bit longer than the ~66 ft
required for a resonant half-wave dipole on 40 meters. As Don mentioned
making the antenna longer will make it easier to tune on 20 and 10
meters where a 66-ft antenna has an extremely high feedpoint impedance.
Exact length is not critical as long as the two legs of the antenna are
of equal length. If you have room, you could try an end-to-end length
of 87 +/- 3 ft or 105 feet +/- 5 feet. These two lengths are not
magically efficient or any such thing, but a lot of us have found them
easy to tune on multiple bands with simple tuners.
The two lengths will look familiar to users of the W3EDP and G5RV
antennas. Both lengths tune well as a center-fed doublet on non-WARC
bands from 40m on up. Both can be pressed into service on 80m if
need be.
73,
Ken
K3VV
Coopersburg, PA
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