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Old Feb 17, 2011, 12:12 PM
Speed Nut
Joined Jan 2010
479 Posts
I built a SP out of 1mm steel music wire.
I wrapped a thin copper wire at the solder points to help with soldering. It worked.

Now I have a cloverleaf on the tx and a SP on my trimersion rx.
It works so far very well with very clean video in the house, and I can go to different rooms (walls are made with bricks and cement ) with little or no disturbances.
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Old Feb 17, 2011, 01:09 PM
Engineer for Christ
IBCrazy's Avatar
Amherst, VA
Joined Jun 2006
10,577 Posts
That's the exact setup I use! Same TX antenna, RX antenna and even goggles It works great. 1 mile is easy on a BoB 700mW. However somebody is doing 2 km on 10mW! I have no idea how.

-Alex
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Old Feb 17, 2011, 01:16 PM
Speed Nut
Joined Jan 2010
479 Posts
Quote:
Originally Posted by IBCrazy View Post
That's the exact setup I use! Same TX antenna, RX antenna and even goggles It works great. 1 mile is easy on a BoB 700mW. However somebody is doing 2 km on 10mW! I have no idea how.

-Alex
Oh, that's me doing 2km on 10mw (actually the trimersion tx is 12mw).

I have the luck of living on the mountains in south Italy (used to live in Virginia USA), and there is no wi-fi , the spectrum is pretty clean bar the cellular frequencies and umts 900-1800-1900-2100 mhz.

Where I fly from the top of the slope I can get huge range with not so great setups so my results don't really count and are not replicable near towns.
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Old Feb 20, 2011, 04:43 AM
KF5LDN FPV Junkie!!!
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United States, TX, Lubbock
Joined Nov 2009
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OK so I read the thread and have decided this is the way to go. I'm just unsure how to get those very nice symmetrical bends? Any tips? I can make a nice jig for the antenna but I'm not sure what's the best way to get those.

Quote:
Originally Posted by Derek_S View Post
I flew with the SPW and 3 turn Helix today. IMO I got very good results. I beat a personal record and hit 2 miles with ok video.
You said you were using 72Mhz?
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Old Feb 20, 2011, 07:35 AM
Videopilot
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United States, NC, Charlotte
Joined May 2009
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IN that case I was using TLRS.
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Old Feb 20, 2011, 08:01 AM
Engineer for Christ
IBCrazy's Avatar
Amherst, VA
Joined Jun 2006
10,577 Posts
Quote:
Originally Posted by Wizzard033 View Post
OK so I read the thread and have decided this is the way to go. I'm just unsure how to get those very nice symmetrical bends? Any tips? I can make a nice jig for the antenna but I'm not sure what's the best way to get those.



You said you were using 72Mhz?
I hand bend everything. I couldn't figure out how to make a jig for this one. I just used a measuring board. Everything else is done by hand.

-Alex
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Old Feb 20, 2011, 11:55 PM
KF5LDN FPV Junkie!!!
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United States, TX, Lubbock
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Cool, I have an idea to build a jig that might make this easier to build and could be adjusted and remade if necessary.
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Old Feb 22, 2011, 06:06 PM
...just an earth bound misfit
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Joined Mar 2010
660 Posts
Quote:
Originally Posted by Hugeone View Post
Found out my AIO goggle and 5.8tx from Foxtech use RP-sma, if anybody want my 5.8ghz pin-wheels just PM me.

-Hugo
They showed up in the post tonight Hugo. Merci beaucoup!

I just tried screwing them onto my RC305 and am sad to report that it looks like these SP antennas have the RP-SMA connectors, not your goggles & reciever.

I'll dig around for adapters so I can do initial ground tests and throw them on the FieldFox for antenna measurements. It may take a while before I can get to it because work is getting a bit nuts right now.

These are gorgeous pieces of tech sculpture but the axial symmetry is a bit wobbly, so I'm expecting the performance may be a bit off as well.
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Old Feb 22, 2011, 06:16 PM
...just an earth bound misfit
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Joined Mar 2010
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Quote:
Originally Posted by Dirt-Torpedo View Post
...I just tried screwing them onto my RC305 and am sad to report that it looks like these SP antennas have the RP-SMA connectors, not your goggles & reciever.
They are as you say, my mistake, as I say it's hectic at work and the pressure is getting to me. In either case I will get some adapters.

Thanks again.
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Old Feb 23, 2011, 02:05 PM
Happy FPV pilot
lucianozan's Avatar
Italy
Joined Feb 2009
148 Posts
Following this tutorial I built an SPW for my 5.8Ghz 200mW kit and today I've tested it on my FPV EasyStar.

I did 3 tests...but the results with SPW are not very cool:
1 - standard whip antenna on VTX and VRX
2 - SPW on VRX and whip on VTX
3 - SPW on VTX and whip on VRX

On flight 1, without SPW, I reached 1.000m with some grain after 600m and some disturbance around 900-1000m but the visual was good

On flight 2 I reached 500m with a good image, probably better than flight 1, but after 500m I got a lot of disturbance and around 800m I had to come back as there were a lot of grain and disturbance

On flight 3 I was not able to get 500m and I had to came back very soon.

I know that my SPW is probably not perfect as geometry ...but building these 5.8Ghz antennas it's not so easy.

Next days I'll try with a Cloverleaf or a Vee on VTX and the SPW on VRX and see if I can get better results.

Any suggestion?
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Old Feb 23, 2011, 02:44 PM
Registered User
Alberta, Canada
Joined Sep 2001
1,292 Posts
If you have the extra antenna try Skew Planar wheel (SPW) -> SPW or cloveleaf (CL) -> CL or SPW -> Cl or CL -> SPW and see if that helps.
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Old Feb 23, 2011, 02:49 PM
Speed Nut
Joined Jan 2010
479 Posts
Quote:
Originally Posted by lucianozan View Post
Following this tutorial I built an SPW for my 5.8Ghz 200mW kit and today I've tested it on my FPV EasyStar.

I did 3 tests...but the results with SPW are not very cool:
1 - standard whip antenna on VTX and VRX
2 - SPW on VRX and whip on VTX
3 - SPW on VTX and whip on VRX

On flight 1, without SPW, I reached 1.000m with some grain after 600m and some disturbance around 900-1000m but the visual was good

On flight 2 I reached 500m with a good image, probably better than flight 1, but after 500m I got a lot of disturbance and around 800m I had to come back as there were a lot of grain and disturbance

On flight 3 I was not able to get 500m and I had to came back very soon.

I know that my SPW is probably not perfect as geometry ...but building these 5.8Ghz antennas it's not so easy.

Next days I'll try with a Cloverleaf or a Vee on VTX and the SPW on VRX and see if I can get better results.

Any suggestion?
Hello Luciano,
do you have a close-up of the solder job?
It looks like there might be a large gap between the ground and feed point.
Also your connector (ground) is touching the wires, effectively shortening those legs of the element, but without a close-up picture, it's hard to tell.


I would leave a few cm of antenna wire coming out of the connector so you can be precise with the soldering.
I had the same problem with the antenna directly soldered to the connector.
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Old Feb 23, 2011, 03:25 PM
Registered User
SW England
Joined Aug 2009
800 Posts
Having the antenna so close to surrounding metalwork of the VTx can 'block' or distort the radiation pattern from the S-P.
I made my 5.8GHz S-P at the end of a short piece of coax cable, which was recommended to me by the Canadian Radio Amateurs where I re-discovered the S-P antenna from.
They said it was better to keep the S-P at least one wavelength away from surrounding metal parts.

A S-P will always be 3db down on cross polarised antennas, that is to say, a S-P on the VTx and a whip on the VRx (or vice-versa).

The best CP performance will always be with a S-P on the VTx and either a S-P on the VRx or another CP antenna on the VRx, eg a CP helical beam.

Nigel.
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Old Feb 23, 2011, 09:10 PM
Engineer for Christ
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Amherst, VA
Joined Jun 2006
10,577 Posts
I find the cloverleaf (3 blade) is a bit easier at 5.8GHz. It performs just as well as the skew-planar wheel in my tests. You need to compensate for the added length given from the coaxial cable sticking out of the connector by shortening the lobes a bit.

-Alex
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Old Feb 24, 2011, 01:33 AM
Happy FPV pilot
lucianozan's Avatar
Italy
Joined Feb 2009
148 Posts
Thank you for your comments and suggestions. I'll keep you informed about my next tests.
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