If you intend to model a Moxon, particularly the Leeson Moxon, you will
need software that uses the NEC4 engine.
NEC2, commonly used in amateur software because it is free, does not
handle right angle connections and tapered elements correctly.
Numerical corrections have been developed for the taper issues
(primarily by Leeson) but NEC2 still does not handle elements that
are not parallel very well.
73,
... Joe, W4TV
On 7/26/2017 6:28 PM, Dave Sublette wrote:
I have spent a fair amount of time reading a few of the Moxon construction
articles about the modified Moxon for 40 meters. I have a spare 6 element 20
meter Telrex monobander for 20 meters in my barn. Doing some scratching on
paper, it looks like I could build two, two element Moxons for 40 using the
material in that yagi. I would need to buy the tubing necessary to build the
Tee sections on the end.
Since all of the element diameters and taper schedules would be different, I should model it.
I have the Antenna Model Software package. I haven’t used it much. I haven’t
modeled antennas in over 15 years. I used to use K6STI software when I did and I loved it.
Some of the articles I have read say good things about the Antenna Model program. I am
wondering if that would be good enough to use on the Moxon.
Now I know the Moxon doesn’t model well. The W6NL version is the standard and the best
advice is to build it like that. But I have all this beautiful aluminum that I don’t
want to waste. Plus, the 3 1/2 inch boom on the T-rex is really stout enough to handle this
antenna. At least one article says they wish they had used a larger boom diameter.
I suppose a good plan would be to model the W6NL and then my version on the
same software and adjust my version until the results matched those obtained
with the W6NL. The question is .. Is the Antenna Model package adequate for
the job?
A really good answer would be that someone has already modeled the W6NL on
Antenna Model and would share the file with me. :-)
Thanks,
Dave, K4TO
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