Very interesting and helpful video. One correction on your slide of "Why is the driven element shorter than expected?" : The velocity factor in the lower right-hand corner of the table should not be 0.81. Dividing 430 by 492 will yield an implied velocity factor of 87.4%, not 81%. That difference threw me for a while when I was doing calculations and comparing to Moxgen-generated dimensions.
Can you make another video or email me the details on how you interconnected the 10M and 15M moxon. I know you said you didnt like the SWR that you saw so you ultimately ran separate cables. I would like to experiment and nothing for nothing those SWR's were bad for the ease of running 1 cable. KC1POV
Ah ha! That does sound confusing on the video! Should have said: "I used FOUR 3-piece telescoping fishing rods......" So yes, you need four of them. Thanks for the comment. It is a very worthwhile project as it works so well when mounted at modest heights. Mine is normally at about 16-17 feet. 73 -Toivo
Very clever design. I am going to take this idea and improve on it I hope. I would like to reduce the weight. It looks like the antenna does not line in one plane, but droops down on the sides near the 2 separators. Is it safe to assume this did not affect the performance?
There is very little change caused by the shape or the droop. Have modeled it quite a bit and used it extensively. I like your idea of making it lighter, and I have been looking for plastic channel material for the boom and rod supports as well. Have fun with it!
Modeling it with segmented arcs, it behaves like a rectangular one with slightly more forward gain and a more complicated back-side pattern. I've been super happy with how it has worked out with practical on-the-air performance, as it has gotten me to 166 countries worked, mostly on phone, from an HOA.
Moxons work very well on 10 meters, so yes, absolutely! Use the formula at the 5:15 mark for the driven element and the spacing should probably be a bit under 7 feet. Make the reflector 5-6% longer than the driven element.
@@W8TJM Wow, thank you so much sir. You see, I am just new to hf starting with just an hr2510 and a rotary dipole. All the best to you sir and your family. 73s, DW1QEW.
@@franciscolopez3229 If you have a dipole, you can add a homemade reflector that is 5% longer than the dipole and 7ft away from it. You can also, add a director that is 5% SHORTER than the driven dipole and placed about 7ft in the opposite direction as the reflector and you then have a 3 element yagi. I built mine with romex wire inside pvc pipe mounted on a 12 ft 2x4 board. It is fastened in a tree and barely visible. Multiple antennas with an antenna switch act as a rotor.
Amazing! A really good antenna solution!
Thanks Chuck. Really looks like some fun projects.
Excellent presentation!
Very interesting and helpful video. One correction on your slide of "Why is the driven element shorter than expected?" : The velocity factor in the lower right-hand corner of the table should not be 0.81. Dividing 430 by 492 will yield an implied velocity factor of 87.4%, not 81%. That difference threw me for a while when I was doing calculations and comparing to Moxgen-generated dimensions.
Hey, good catch, and you are spot on! Glad to hear it is correlating with Moxgen analysis as well.
Can you make another video or email me the details on how you interconnected the 10M and 15M moxon. I know you said you didnt like the SWR that you saw so you ultimately ran separate cables. I would like to experiment and nothing for nothing those SWR's were bad for the ease of running 1 cable.
KC1POV
I am really blown away. I put this Antenna on my personal DIY to do List. Tnx for sharing. 73 & happy Humpday de Uncle Günter 💯👌🙋♂
Danke for the comment! I will email you some further detail if you would like.
Great looking antenna. Lightweight and physically manageable.
Great design but I think you said "I used 3 telescopic poles" I think I need 4 right?
Ah ha! That does sound confusing on the video! Should have said: "I used FOUR 3-piece telescoping fishing rods......" So yes, you need four of them. Thanks for the comment. It is a very worthwhile project as it works so well when mounted at modest heights. Mine is normally at about 16-17 feet. 73 -Toivo
Very clever design. I am going to take this idea and improve on it I hope. I would like to reduce the weight. It looks like the antenna does not line in one plane, but droops down on the sides near the 2 separators. Is it safe to assume this did not affect the performance?
There is very little change caused by the shape or the droop. Have modeled it quite a bit and used it extensively. I like your idea of making it lighter, and I have been looking for plastic channel material for the boom and rod supports as well. Have fun with it!
Are there any gains from this design over the normal rectangular moxon?
Modeling it with segmented arcs, it behaves like a rectangular one with slightly more forward gain and a more complicated back-side pattern. I've been super happy with how it has worked out with practical on-the-air performance, as it has gotten me to 166 countries worked, mostly on phone, from an HOA.
Can it also be done for 10 meters?
Moxons work very well on 10 meters, so yes, absolutely! Use the formula at the 5:15 mark for the driven element and the spacing should probably be a bit under 7 feet. Make the reflector 5-6% longer than the driven element.
@@W8TJM Wow, thank you so much sir. You see, I am just new to hf starting with just an hr2510 and a rotary dipole. All the best to you sir and your family. 73s, DW1QEW.
@@franciscolopez3229 If you have a dipole, you can add a homemade reflector that is 5% longer than the dipole and 7ft away from it. You can also, add a director that is 5% SHORTER than the driven dipole and placed about 7ft in the opposite direction as the reflector and you then have a 3 element yagi. I built mine with romex wire inside pvc pipe mounted on a 12 ft 2x4 board. It is fastened in a tree and barely visible. Multiple antennas with an antenna switch act as a rotor.