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Apr 02, 2011, 07:48 PM
Engineer for Christ
IBCrazy's Avatar
New Product

Turnstile UHF RX antenna for your LRS


If you own a flying wing, you know what a pain it is to find a place to mount your LRS antenna upright for proper polarization. Now you don't have to. The turnstile antenna is a dual polarized antenna that is designed to lay flat where it is convenient.

I designed this antenna specifically for flying wing pilots, but it works just fine for any airplane. Mount the antenna flat on the bottom of the wing. The radiation pattern has no holes in it and is almost a perfect sphere. I use this with my Dragonlink, but it will work with any UHF radio system. While I tend to use it as an RX antenna, it also works as a TX antenna.

Admittedly, I need to give credit to MR. RC-CAM for this one. He challenged some of us on the RC-CAM forum to figure it out and build one.... So I did It uses the reactive impedances to match a proper 50 ohm load hence the mist matched leg lengths.

You can buy one from Video Aerial Systems

Or of course, you can build your own. But I won't force you guys to figure out the math. Instead, here's a video to show you how it's done:

Build IBCrazy's 433MHz Turnstile antenna for FPV (6 min 5 sec)


Why am I giving away the details? Because I want to, that's why I encourage you who have fair soldering skill to try one.

-Alex
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Apr 02, 2011, 07:53 PM
Thou who know not
Po73's Avatar
Have you done a range test in the air yet? I've been contemplating using these for both video and rc on the flat side on a raidian.
Apr 09, 2011, 11:12 AM
Post # 20 million
Kev.au's Avatar


Thanks for offering this design, Alex.





Cheers, Kev.
May 21, 2011, 06:38 AM
Post # 20 million
Kev.au's Avatar
And one mounted on my bros quad.




Cheers, Kev.
May 21, 2011, 09:43 AM
Air Crash Expert
sawman's Avatar
Alex,
I have copper foil with adhesive backing. It is 3/4 inch in width. Guess you know where I'm going with this.
What effect does the width have on the element lengths ? Also curious about what kind of gain to expect.
May 22, 2011, 07:27 AM
Honey Badger
Blue Chip's Avatar
Will putting a piece of ny-rod over the elements change anything?
May 22, 2011, 08:07 PM
Engineer for Christ
IBCrazy's Avatar
Quote:
Originally Posted by sawman View Post
Alex,
I have copper foil with adhesive backing. It is 3/4 inch in width. Guess you know where I'm going with this.
What effect does the width have on the element lengths ? Also curious about what kind of gain to expect.
Bad idea. The element thickness is critical. The lengths are actually quite loose but you must use 20-24AWG wire.

-Alex
May 23, 2011, 05:44 AM
Registered User
Hello !

I can install the antenna along the aluminum arms of a MK?
I think about wiring the metallics arms with battery ground.Good idea or it's useless?
Thanks
May 23, 2011, 07:30 AM
Engineer for Christ
IBCrazy's Avatar
I would not do that. The aluminum will mutually couple with the antenna similar to how a Yagi antenna works. However, in the case of the booms, it will most certainly be a bad thing...

-Alex
May 23, 2011, 09:21 AM
Air Crash Expert
sawman's Avatar
Quote:
Originally Posted by IBCrazy View Post
Bad idea. The element thickness is critical. The lengths are actually quite loose but you must use 20-24AWG wire.

-Alex
Thanks .
May 23, 2011, 11:32 AM
Registered User
Quote:
Originally Posted by IBCrazy View Post
I would not do that. The aluminum will mutually couple with the antenna similar to how a Yagi antenna works. However, in the case of the booms, it will most certainly be a bad thing...

-Alex
Thanks Alex !

Ok ,it's not recommended to use turnstile antenna on quadrocopter with metallic frame ,stock antenna is preferable?
May 23, 2011, 12:28 PM
Engineer for Christ
IBCrazy's Avatar
The stock antenna won't do any better on a metal frame. The aluminum will react just the same. This is a case where 2.4GHz would be the best choice for control.

-Alex
May 23, 2011, 12:59 PM
RC pilot by soul
Alex,

Will 18 AWG wire off a burnt computer PSU work well ?
May 23, 2011, 02:36 PM
Engineer for Christ
IBCrazy's Avatar
It would do ok. It would be a little out of circularity, but you'll be ok for most purposes.

-Alex
May 23, 2011, 02:39 PM
RC pilot by soul
Quote:
Originally Posted by IBCrazy View Post
It would be a little out of circularity
What does that mean in simple terms ?


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