[TowerTalk] separation between 40m rotary dipole and 3 element beam

[Chuck Dietz]

I don’t see how putting antennas on the opposite side of the mast does
anything. They are still connected to the same mast and exerting forces in
the same direction according to the wind resistance on either side of the
mast. Visualize mounting the beam on a mast at 5 feet above ground. If you
push on one end of the beam, it exerts the same force on the mast and in
the same direction no matter which side of the mast it is mounted on.
I used to believe this until I thought it through.

Chuck W5PR

On Fri, Mar 18, 2022 at 6:27 PM J. Hunt via TowerTalk <
towertalk at contesting.com> wrote:

>  Have my 40 meter rotary dipole 8' above the quad band beam, parallel with
> the beams boom, opposite side of the mast pipe.
> The opposite side cancels some of the shear forces on the HyGain Tx2 rotor.
> Cheers,Jameski5dq
>
>     On Friday, March 18, 2022, 05:40:26 PM CDT, Jim Brown <
> jim at audiosystemsgroup.com> wrote:
>
>  On 3/18/2022 1:36 PM, Jamie WW3S wrote:
> > What would be an acceptable separation between a 40m rotary dipole and a
> > 3 element beam?
>
> The same stub carefully placed as described in this link in the 40M
> feedline to suppress the second harmonic of 40M will also kill
> interaction of that 40M dipole with 20M. The first link is text, the
> second is the slide deck for talks I've done on the technique.
>
> http://k9yc.com/LocatingStubs.pdf
> http://k9yc.com/StubPlacement.pdf
>
> 73, Jim K9YC
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