MOXON

[WA1GFZ]

A couple days ago Tom sent me some design software for a moxon beam. The nice thing is it dumps a design file into 4NEC2X. So simulated a beam for 40 then tried swapping the pattern like we do with the loops. Results were better FB then the loops and a lower radiation angle. Then I modeled it to my yard where the ends would droop down a bit from the feed point. I'm seeing almost 6 dbi gain at 15 degrees TO and about 9 dBi at 30 degrees with a FB around 25 db. HUZ I think this thing would blow the doors off your loops at your height and the horizontal section is only 50 feet within a few feet of the delta top section.

[K1JJ]

The Moxon does have a nice pattern, esp f-b, for a 2el antenna.  It's really a 2el yagi with each dipole's ends folded inward towards the other element.

The average height of a Moxon dipole (even slightly inv vee) is higher than a conventional delta loop.

Interesting on the "inv vee"  Moxon. I was gonna try modeling that since it approximates most of the average ham installations.  So you say the pattern stays together in inv vee form.

I just installed a 75M 2el wire Yagi using inv vees for S. America.  According to modeling, inv vees work just fine as long as they are tuned to compensate the slope.  The pattern is down very slightly from a flat Yagi, but the f-b is still robust.

I wud have done the Moxon, but guy wires and tower placement didn't permit it this time.

With your ropes and pulleys, maybe you shud haul one up?

BTW, Huzman is the one who turned me onto the Moxon last spring.

T

[WA1GFZ]

Tom,
This is what I'm playing with for 40m (in Feet)
Apex=55
End and side height =40.5
Spacing= 18.2
Siide element 4 places= 8.22
Main 1/2  Element 25.1
VSWR= 1.27 at 7.15
Reflector stub is 4 feet electrical length which can sit at the end of a 1/2 wave section. All coax is 50 ohm.
Issues, VSWR kind of high at 7 mhz but very good to over 7.3 mhz so may shift it down a bit.
I plan to simulate one for 75 since it would only be 85 feet wide and spaced 37 feet.
It would easily fit between the top of the tower and the tall tree I was using before I put up the boom. 

[WA1GFZ]

I simulated an 80 meter moxon and found the ends and sides need to be at least 45 feet to get a good pattern. It ended up about 40 by 80 feet and reversable.
It is an interesting antenna.