It is easy to cancel the radiation from the 'counterpoise' - use 2 equal
length wires running in opposite directions from the base. The
horizontal radiation from each will cancel, and all you have left is the
loaded vertical radiator to radiate with vertical polarization.
If they are on the ground, the cancellation may not be as uniform.
For further information read the section on verticals in any Antenna
Handbook - even my Antenna Handbook from the late 1950s cover it.
73,
Don W3FPR
On 8/27/2019 5:29 PM, Grant Youngman wrote:
I don’t think I’m missing anything. You’re basically arguing for an elevated
counterpoise. Of course the AX1 needs a counterpoise. And I run an elevated
counterpoise on most of my portable vertical antennas.
My 31’ portable wire works better than an AX1 most of the time. It’s not
always convenient or possible to put a wire in a tree. And a wire counterpoise
for your AX1, 3-5’ off the ground, straight as an arrow, won’t radiate much
anyway (although it can help adjust the native imdedance of the
AX1/counterpoise system). When I walk to the dock, I take the AX1 and the
recommended counterpoise. The counterpoise goes over the end of the dock — no
trees down there :-)
I’m not saying that an elevated counterpoise won’t work with the AX1, just that
I’m having trouble getting my head around considering the wire as the main
radiator, and the AX1 as a counterpoise???
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