[ADXA] I made a 40m Dipole

[Charles Korzendorfer]

75 degrees.  THAT IS CRUEL…
KM5G

On Wed, Jan 8, 2025 at 1:09 PM Stan Stockton <wa5rtg at gmail.com> wrote:

> Thought I would share this with you.  I wanted to put up a flat dipole and
> the space between the two towers was not enough.  I didn’t want other ropes
> taking ends down close to the two towers, one of which is shunt fed for 80
> and the other for 160.
>
> At each end there is a six foot piece of 1/2” aluminum tubing.  The dipole
> is 47 feet long and connects to that tubing in the center.  From each end
> of the 6 foot pieces of tubing a wire comes back and is soldered to the
> main wire at 149 inches out from the center (or 133 inches back from the
> end.
>
> You’ll have to blow the picture up to see the dipole.  This is 2/3 the
> length of a normal dipole.  It is a perfect match to 50 ohm coax.  A flat,
> full sized one will never be better than 1.5-1 without some matching.
>
> There are lots of applications for this style for the low bands including
> sloping dipoles (about 88 feet for an 80m dipole) shorter verticals for a 4
> Square, etc.
>
> Unfortunately this thing doesn’t model too well even with NEC-4.  It
> showed resonance about 150 kHz lower than it really turned out to be.
> NEC-2 showed resonance 535 kHz low!
>
> The software was good to determine what to change to move it however much
> it needed to be moved after I put it up.
>
> 73…Stan, ZF9CW (Sorry, it’s 75 degrees here) 😀
>
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> Sent from my
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