RCHacker Because of legal restrictions in the UK where i fly. Otherwise i'd be on 433mhz. Fortunately the OpenLRSng is programmable for that kind of stuff.
christophertelford i can't give you the link. but somebody at rc group said that the power decreases when you run away from the center @ 433. anyway you might be interested and look that one up.
Hi Marc, Thanks a lot for all your videos. A great help and I have your videos bookmarked. Helps me a lot. Question: You mentioned that the ground is slightly longer than the main on your video but these lengths are not in your cheat sheet. Can you help?
Hi rchacker,I am very interested in getting into fpv. Would like to know if you have any videos out on how to connect the wires from the receiver on back. Including any added bateries bec,osd,cameras and gps device. Also,lets not forget the fpv transmiter,receiver and ground station. It will greatly give me a better view of how to get set up thank you.
Thats a huge topic. I went down a specific path that although it was cheap it needed a lot of soldering and DIY skills. My stuff is not really for beginners and you will have to do some research to 'fill in the gaps'. Google "flitetest beginners fpv" they do good videos and might be a good start for you.
Hello Brother, Can you please explain the calculations of vee antenna design? How do you calculate both the lengths of the antenna? what is length of vee antenna for 512mhz? thanks
Hello Marc ! First - thank you for all your videos and blog - big source of information and DIY thinks (which I love) Just building my first quad - and put V antenna to test - what is the reason to put V in horizontal position ,according to radiation pattern - it will be better to put it verticaly (?) I'v done some tests ,with two V horizontaly - I'v had a trouble while turning back, horizontal vs vertical vas terrible of course. Now I'm testing a V on TX verticaly, and a Ibcrazy's monopole on quad, - same result with polarization while vertical is good.
You're welcom Jan. I have it horizontal because my moxon is mounted horizontal, and it fits better on my multirotor. You might be right that vertically is better. Experiment always wins over theory.
Hi Marc, Thanks a lot for sharing your knowledge. I have an openlrs system and plan to make an inverted vee antenna according to your design. I was just wondering, how important is the thickness of the wire? I currently have some regular .6mm wire laying around. Do you think it will perform noticeably poorer than 1mm? Thanks for your answer. Cheers
Does the coax length have an influence before the Vee wires? I have old antennas I'll use to make the basis for this antenna. Does the plastic part around makes a big difference or I can let it on? Thanks for explaining and sharing
The impedance is matched so the coax length is not important. With a short one the radio itself will mess up the pattern a bit. I'd leave the plastic there for strength.
Happy to see you back ! Excellent video, thanks for sharing. Can you confirm that longer wire go to inner part of coax and short wire goes to out (coax)? Also can you give detentions for 2.4 gHz? Thanks again.
long to outer and short to inner, I have to look up the dimensions for the 2.4G. Will put that on the cheat sheet. Until I get that up all I can offer is the nec files on github. github.com/rchacker/antennas/tree/master/2.4
I have seen some people making Y shaped V antennas (base of the Y as the feed in) where both elements are the exact same length. I was following such a guide when i made my last V antenna. How much of an advantage do you think there is in using unequal lengths? Would either method work ok? Cheers for all the info!
On the simulation I got a minor improvement with the asymmetric model. The computer chose it, it is possible to 'evolve' designs and let the computer figure out which is best. I did this with a symmetrical model also.
Wouldn't just be more easier to show formula how to design the V? I mean how to calculate longer and shorter arm... How did you come up with two arms not equal to each other? Is it due to better SWR or what?
I let the 4nec software test a whole variety of lengths for best SWR. The asymmetric one is what it came up with. The asymmetric model came up with a better SWR.
RCHacker In the US those of us with ham licenses get 420-450. I would build a version at 425 and set openLRS to center there if you wanted to post that up. Its annoying to me that everyone wants to run right around 433... get creative, there's plenty of band around available here ;)
Ian Ferrell Great, so 433, then 425 and 440 for the hams and 459 for the brits. 420-450 is the similar for hams in oz. I've got the middle of the frsky gear written down somewhere, that leaves 900-1.2G. 915, 1100 1250 ?
Great video!! I'll be building one of these for my EZUHF 8 channel diversity RX this evening! Thank you
Would a dozen Vees attached next to each other increase the signal strength ?? Thanks
I was just looking to make one of these myself for 459mhz and an openLRSng radio receiver. Nice timing!
Why 459?,
RCHacker Because of legal restrictions in the UK where i fly. Otherwise i'd be on 433mhz. Fortunately the OpenLRSng is programmable for that kind of stuff.
Is that centred on 459? Do you know the exact range and power limitations off hand?
RCHacker I believe it's 458.5 - 459.5 MHz at a max power rating of 100mW. So definitely possible with the OpenLRSng gear.
christophertelford i can't give you the link. but somebody at rc group said that the power decreases when you run away from the center @ 433. anyway you might be interested and look that one up.
What is that 9 prop drone? It looks awsome steampunk!
Hi Marc, Thanks a lot for all your videos. A great help and I have your videos bookmarked. Helps me a lot. Question: You mentioned that the ground is slightly longer than the main on your video but these lengths are not in your cheat sheet. Can you help?
Hi rchacker,I am very interested in getting into fpv. Would like to know if you have any videos out on how to connect the wires from the receiver on back. Including any added bateries bec,osd,cameras and gps device. Also,lets not forget the fpv transmiter,receiver and ground station. It will greatly give me a better view of how to get set up thank you.
Thats a huge topic. I went down a specific path that although it was cheap it needed a lot of soldering and DIY skills. My stuff is not really for beginners and you will have to do some research to 'fill in the gaps'. Google "flitetest beginners fpv" they do good videos and might be a good start for you.
what is advantage of vee antenna over normall dipole??what its angle do(effect of changing angle between antennas pole) ???
Hello Brother,
Can you please explain the calculations of vee antenna design? How do you calculate both the lengths of the antenna? what is length of vee antenna for 512mhz? thanks
Hello Marc ! First - thank you for all your videos and blog - big source of information and DIY thinks (which I love) Just building my first quad - and put V antenna to test - what is the reason to put V in horizontal position ,according to radiation pattern - it will be better to put it verticaly (?) I'v done some tests ,with two V horizontaly - I'v had a trouble while turning back, horizontal vs vertical vas terrible of course. Now I'm testing a V on TX verticaly, and a Ibcrazy's monopole on quad, - same result with polarization while vertical is good.
You're welcom Jan. I have it horizontal because my moxon is mounted horizontal, and it fits better on my multirotor. You might be right that vertically is better. Experiment always wins over theory.
Hi Marc, Thanks a lot for sharing your knowledge. I have an openlrs system and plan to make an inverted vee antenna according to your design. I was just wondering, how important is the thickness of the wire? I currently have some regular .6mm wire laying around. Do you think it will perform noticeably poorer than 1mm? Thanks for your answer. Cheers
Does the coax length have an influence before the Vee wires? I have old antennas I'll use to make the basis for this antenna. Does the plastic part around makes a big difference or I can let it on? Thanks for explaining and sharing
The impedance is matched so the coax length is not important. With a short one the radio itself will mess up the pattern a bit. I'd leave the plastic there for strength.
I mean how this v antenna design software can be used for 512mhz?
Hi Mark, can you please tell us the formula to work out ourselfs ? or did i miss it and you have already, cheers Brett
Hi Brett, links to the cheat sheet are above. There are no formula as such but there is a table of good designs that I made using 4nec2
Happy to see you back !
Excellent video, thanks for sharing.
Can you confirm that longer wire go to inner part of coax and short wire goes to out (coax)?
Also can you give detentions for 2.4 gHz?
Thanks again.
long to outer and short to inner, I have to look up the dimensions for the 2.4G. Will put that on the cheat sheet. Until I get that up all I can offer is the nec files on github. github.com/rchacker/antennas/tree/master/2.4
RCHacker
My 4NEC2 couldn't open the files ;(
I have seen some people making Y shaped V antennas (base of the Y as the feed in) where both elements are the exact same length. I was following such a guide when i made my last V antenna.
How much of an advantage do you think there is in using unequal lengths? Would either method work ok?
Cheers for all the info!
I will try testing both designs against each other using RSSI in the next few days or so hopefully.
On the simulation I got a minor improvement with the asymmetric model. The computer chose it, it is possible to 'evolve' designs and let the computer figure out which is best. I did this with a symmetrical model also.
Is it possible to simulate circular polarised radiation patterns on that software you are using?
Yes, it is in the preferences.
RCHacker Thanks, love your videos. Wish I had your brain!!
Tom Boulton Sorry, I cant give you that. Besides, I don't think it would work too well removed from my skull.
i thought the moxon antennas are he best?
As a directional antenna they are better...
So is this antenna actually better, than a simple dipole?
Yes. If I remember right straight, best you can do is about 70 ohms.
Wouldn't just be more easier to show formula how to design the V? I mean how to calculate longer and shorter arm... How did you come up with two arms not equal to each other? Is it due to better SWR or what?
I let the 4nec software test a whole variety of lengths for best SWR. The asymmetric one is what it came up with. The asymmetric model came up with a better SWR.
Another great video mark, will you be doing any videos on the openlrsng diversity rx firmware?
Kari has been busy huh?, is it in the main branch yet? I knew it was coming but have not played with it yet. When I'm ready I will have a look at it.
OK,Cool could you please work it out for 423Mhz thanks heaps Brett
Easy, add about 0.3mm to the 425 figures.
What frequencies do people want to see on the cheat sheet. 433, 440, 1080, 2.4?
I can do calculations for each on the simulator.
459mhz for everyone in the UK please :-)
Cool good to know, I only have legal info on Australia and the US.
RCHacker
In the US those of us with ham licenses get 420-450. I would build a version at 425 and set openLRS to center there if you wanted to post that up. Its annoying to me that everyone wants to run right around 433... get creative, there's plenty of band around available here ;)
Ian Ferrell Great, so 433, then 425 and 440 for the hams and 459 for the brits. 420-450 is the similar for hams in oz. I've got the middle of the frsky gear written down somewhere, that leaves 900-1.2G. 915, 1100 1250 ?
christophertelford Cheat sheet is done, www.rchacker.com/diy/antenna-designs-for-rc/vee-antenna/veeantennaIMG_5548.jpg
2 V's equal a turnstile antenna, you can mount on bottom of quadcopter very well watch?v=XbCQeuGtHBM
Onto it, that will be my next antenna video. I have learnt that the radiation pattern is not what everyone things and it is best mounted horizontally.