Wednesday, August 21, 2013

Moxon 2m ,70cm dualband antenna



Baofeng UV-5R with SO 50 satellite  antenna. Moxon +5el yagi

23 comments:

Unknown said...

Pleas diameter elements ?

Klemensas said...

Hi, Alexander, 3mm in diam...

CarlosEduardo.QC said...

Please, 3 questions.
1) Numbers in feet, centimeters or inches?
2) No balun required?
3) I think it is 50 ohms. Thats right?
Thanks a lot

Klemensas said...

1. in mm....2. no balun....3. 50 ohms...Best DX dear Carlos...

Unknown said...

Is there any connection between the 2m and 70cm antennas?
Regards
Mark, KV8T....

Unknown said...

No physical connection between the 2m and 70cm elements. The 2nd 432 element is a parasitic driven element.
I modeled this with 4nec2. I get 11 dbi on 2m and 12.4 dbi on 432! It appears that the SWR on 70cm is very dependent on the length of the 432 driver and its distance from the 144 driven element. The 2.0 SWR bandwidth is fairly narrow, so you need very accurate measurements constructing this antenna.

Unknown said...

Hello everybody! I want to make 2+70 moxon antenna with moxon on 144 and 3 el Yagi for 435
Can you recalculate it for 6.5 aluminium wire.
Thanks a lot by UB8JAS

Unknown said...

Hi, can I use a 3 mm rod to make the antenna?

Unknown said...

yes, but model it with NEC. I used welding rod.

Unknown said...

Hi, which material used for the elements? 73 PP5RD

Unknown said...
This comment has been removed by the author.
CarlosEduardo.QC said...

Please,
Dimensions for 3/8" tubes (9,5 mm)?
Can you help me?

Unknown said...

Hi,

I have done a bit with the Moxon antenna geometry and also a bit with the WA5VJB style Yagi-Uda so I am intrigued with the idea of combining the two like this, It's really interesting that you figured out a way to make it dual band without a physical electrical connection to the 70CM driven element, I'm assuming that's done with near field inductance? Anyway, I was wondering if you could share the formulas you used to come up with this design? This looks like it would be a fantastic antenna for satellite work and those directivity numbers are impressive so it certainly suggests other possible uses at lower frequencies. Is the takeoff angle comparable to the standard Moxon?

73. KG7WPQ

Unknown said...

Thanks to your design i made a similar moxon with the parasitic element and it worked great on the AO-92 this morning. Here is a link to my instagram account to see it in action. My 4 year old named the antenna 'The BeeWasp' I guess because of the paint job i gave it. The BeeWasp works great for repeaters and satellites. Best 73. K5CLC. Chris

https://www.instagram.com/p/Bk8BMYgHvne/

Unknown said...

699mm is inner or outer diameter? I mean - should I add 2x thickness of welding rod (so treat the length as inner diameter) or substract 2x thickness of welding rod (outer)???

luis1sergio said...

my moxon only hear the so-50 because where did I go wrong?

Icd golilla said...
This comment has been removed by the author.
Icd golilla said...

Hello! I have built two moxon yagis, but I can't get swr 2 or 2.5 in uhf. I don't know what I'm doing wrong 🤔 73 from Tenerife
Isidro-EA8DGA

Joshua said...

Finished this antenna today. Used 1/8" copper tubing. Mounted the elements to the 3/4" PVC using 3D printed parts. Heard AO-91 all the way down to the horizon. Waiting on my call sign so haven't tried transmitting yet.

agusslametwibowo said...

Hello my friend, how many mm space between moxon feed point element and 325mm driven UHF element ? Thanks YG3FYQ 73

Rober-X said...

Congratulations on the Antenna and Thanks for sharing the drawing. - It can be transmitted in UHF, or only RX UHF and TX VHF ???? - How can I adjust the SWR? 73

Joshua said...

TX and RX on both bands. If I remember right, you adjust SWR by the 22mm distance between the driven element and the first director.

Manuel said...

Puedo utilizar alambre de aluminio de 4,4 mm de diámetro para la construcción de esta antena?