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Old Sep 26, 2011, 08:27 AM
Engineer for Christ
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The coaxial cable can be any length you want. It's fairly easy to build a turnstile and they work great.

-Alex
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Old Oct 12, 2011, 07:19 PM
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What is best AWG wire to build turnstile antenna ?
It can be silicone wire ?
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Old Oct 12, 2011, 10:51 PM
Post # 20 million
Kev.au's Avatar
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Quote:
Originally Posted by marcin.gala View Post
What is best AWG wire to build turnstile antenna ?
It can be silicone wire ?
18-22 AWG, i've used the silicone wire from HobbyKing without any problems.



Cheers, Kev.
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Old Oct 13, 2011, 04:18 AM
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Could I use this antenna type for my 2.4GHz VTx ?
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Old Oct 13, 2011, 09:08 AM
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I'm still developing the 2.4GHz version. Currently looking at 9.5dbic gain for it.

-Alex
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Old Nov 09, 2011, 08:31 AM
Team Basement RC
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Toronto, Canada
Joined Jul 2004
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Hi Alex. I love the antenna tutorials you have here, and I thank you for what you and others have taught me here.

I have already built a few of your antennas for my FPV systems and I love how much they have improved my video quality and range.

My question:

I have a 900mhz Video system, and have built Inverted Vee for my VTX and have been using HugeOnes Virvent for my VRX. I also jsut completed building Huge ones Turbine for my VRX, which I will try this weekend.

So: Can I use this turnstile for my VTX? It would have to be 910 Mhz.

I am curious about the math for this design, I cant figure how you got 6.75" and 5.85" for you 433Mhz system. The math is not that obvious. Is it that complicated? If it is, can you give me the numbers for a 910 system?(assuming it is worth doing?)

I plan on using 0.85mm wire, if that helps.

Cheers,
Max
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Old Nov 09, 2011, 10:16 AM
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No. The circularity shifts across the Z-axis. Hugo and I are using it as part of an experimental antenna: the Crosshair.

Tutorial coming soon

-Alex
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Old Feb 18, 2012, 09:00 AM
Michael W.
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United States, TN, Cleveland
Joined Nov 2011
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Alex, I have an EZuhf system with diversity...would there be any benefit to using diversity if I am usingthis type of antenna? If yes, then should I keep a sanders style on the plane as well (Skywalker) in a different position? Or should I stick with the bunny ear set up I currently have? thanks ahead of time, and by the way, Our church in TN is considering a mens interest group to teach RC flying, as well as possibly helping point them toward FPV!
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Old Feb 20, 2012, 09:07 AM
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Yes there is a benefit. Use the turnstile laid flat and the Sander style upright. You now have no way to lose polarization

_Alex
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Old Feb 20, 2012, 03:27 PM
Michael W.
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United States, TN, Cleveland
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Quote:
Originally Posted by IBCrazy View Post
Yes there is a benefit. Use the turnstile laid flat and the Sander style upright. You now have no way to lose polarization

_Alex
nice! I will give that a shot. thanks Alex, hope all is going well for you
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Old Feb 21, 2012, 06:28 AM
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United States, FL
Joined Oct 2005
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Assuming this antenna is the only one being used for 433 control - does anyone have any kind of testing on it at range?

I'm curious as to why most antennas need to be mounted vertically to maintain polarization - yet this one can be laid flat...
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Old Feb 21, 2012, 06:39 AM
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This out performed my stock DragonLink antenna during ground tests, i haven't tested it with ezUHF, but i will soon as i have a turnstile embedded into my ZII's right wing.

I have flown 3km above myself with zero problems and over 5km away.
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Old Feb 25, 2012, 11:44 AM
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I must have done something really wrong because my turnstile antenna performed just a bit better than the tiny stock OpenLRS antenna. Had a Nagoya NA-711 on my TX. Used 20 AWG wire.

OpenLRS is two-way and I use this feature for telemetry. Mostly for getting alerts when packages fail to send/receive. Maybe stupid question but in combination with the two-way telemetry and the turnstile antenna - could that be causing the bad range?
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Old Feb 25, 2012, 07:19 PM
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Amherst, VA
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If you used a known good antenna and your range was bad, and then built a turnstile and the range didn't improve much, I would say the problem isn't the antenna. It could be noise floor, or perhaps the TX isn't putting out as much power as it is supposed to.

-Alex
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Old Feb 25, 2012, 07:22 PM
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Quote:
Originally Posted by Blue Chip View Post
Assuming this antenna is the only one being used for 433 control - does anyone have any kind of testing on it at range?

I'm curious as to why most antennas need to be mounted vertically to maintain polarization - yet this one can be laid flat...
The beauty of dual polarization my friend You need to put your tX antenna flat and pointed out to the side (thus matching polarization and also giving full strength where you need it). The turnstile has no nulls and is polarized on 2 axes. Waves propagate with less loss when horizontally polarized rather than vertical. Thus you lay the turnstile flat and you have your TX antenna flat as well.

-Alex
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