Does anyone have a good test method to determine the resonant point(s)
of a tower structure? The system is sufficiently complex that I don't
think I can ever get an accurate model for simulation and I think it
will have to be determined experimentally. I expect multiple resonance
points, probably between 1.5 and 4 MHz, and high loss due to the tower
not having a radial system except for what is provided by the ground
system and cables.
The reason for this is that I am trying to plan a location for an 80
meter four square, a 160 meter top loaded vertical, and an EWE array on
my property. Simulations show that resonance of the tower anywhere
close to 80M or 160M significantly affects the other antennas. A
separation of at least 500 feet is required to maintain any reasonable
resemblance of a decent pattern if the resonant point occurs in one of
these bands. I would like to not have to maintain this kind of
separation and hope maybe I can detune the tower, but I need a good test
method.
I know the four square and 160M vertical affect the EWE array, but I can
simulate this.
Jerry, K4SAV
_______________________________________________
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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