Phased MOXON?

[K6JEK]

Years ago I had "possibly the world's best 75 antenna", phased dipoles. Gang busters antenna. But an all important tree died and came down. I could still put up a 75 meter Moxon using a different tree. But what about going a step further and driving both elements?

I'm slowly working up the enthusiasm to model it but wonder if any of you jokers have ever done something like this?

Incidentally,  Dan Maguire, AC6LA has a great program on the web for designing Moxons:

http://www.ac6la.com/moxgen1.html

[Steve - K4HX]

If you drive both elements, it's no longer a Moxon. I know, semantics. But, if you're going to drive both elements, using the Moxon configuration doesn't do much other than save you room. The advantage of the Moxon is that you get good coupling between the two elements like with a phased array, without the hassle of phasing lines or networks.

Consider a symmetrical Moxon (or Moxon like) design with lines running to both elements. One is feed and the other is a shorted or open stub (depends on length). Then you can do some simple switching and get two directions. If I ever take down my 40 meter loops, the switched Moxon would be the replacement.

[w4bfs]

If you drive both elements, it's no longer a Moxon. I know, semantics. But, if you're going to drive both elements, using the Moxon configuration doesn't do much other than save you room. The advantage of the Moxon is that you get good coupling between the two elements like with a phased array, without the hassle of phasing lines or networks.

Consider a symmetrical Moxon (or Moxon like) design with lines running to both elements. One is feed and the other is a shorted or open stub (depends on length). Then you can do some simple switching and get two directions. If I ever take down my 40 meter loops, the switched Moxon would be the replacement.

you might email Ron N4RT .... he runs phased 75 mtr dipoles ... good signal here

Steve...a cool thing to do is to put a parallel resonant tank across the unfed dipole ... by adjusting above/below resonance it is possible to optimize director/reflector properties across the band

[Steve - K4HX]

No need for a tank - a single cap will do the trick with the right length of stub. I trimmed the stubs on my 2-element delta loop array. 20/20 hindsight, I should have made the stubs longer (about 3/8 WL, IIRC) and used a cap to tweak the F/B for maximum. Live and learn. 

[K6JEK]

If you drive both elements, it's no longer a Moxon. I know, semantics. But, if you're going to drive both elements, using the Moxon configuration doesn't do much other than save you room. The advantage of the Moxon is that you get good coupling between the two elements like with a phased array, without the hassle of phasing lines or networks.

Consider a symmetrical Moxon (or Moxon like) design with lines running to both elements. One is feed and the other is a shorted or open stub (depends on length). Then you can do some simple switching and get two directions. If I ever take down my 40 meter loops, the switched Moxon would be the replacement.

Thanks, Steve. I just wondered about driving both elements.  I had very good luck with the too-darned-low phased dipoles but I'll go for the a plain (!) Moxon which will be challenging enough.

[Steve - K4HX]

So why not the phased dipoles again? Different location? Not enough room?

If a Moxon is in your plans, go with the symmetrical one and get two directions. One example at the link.

http://www.moxonantennaproject.com/w8egb/w8egb_reverse.htm

[K6JEK]

So why not the phased dipoles again? Different location? Not enough room?

If a Moxon is in your plans, go with the symmetrical one and get two directions. One example at the link.

http://www.moxonantennaproject.com/w8egb/w8egb_reverse.htm

Yes, not enough room, and what the heck, something to fool around with

[Steve - K4HX]

Good luck with it. I would be interested in your results.