This one is strange. Here's the deal. The beam tuned perfectly for the
previous owner. We carefully labeled the elements, and the re-assembly
looks exactly like the picture in the manual. However, according to the
MFJ analyzer, here are the resonance points:
15.22 MHz - 1.6:1 SWR
21.97 MHz - 1.2:1 SWR
29.35 MHz - 1:1 SWR
The measurements I checked (front and rear driven elements and reflector)
are exactly to manual specs. Previous owner had even drilled the elements
and put a small sheet metal screw to "lock" them in place.
I even replaced the existing balun with a home-made coax balun. No
change. Feeding direct with no balun doesn't change resonance points.
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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