Thanks Hugo

Bonjour Hugo,
Est-ce que les bras supérieurs et inférieurs doivent ils êtres parfaitement parallèles et espacés de la dimention "center"?
Merci

Hello Hugo,
Does the upper and lower arms should they loved perfectly parallel and spaced from the dimention "center"?
thank you

Ils doivent être parallèles et espacés de la dimension "center" oui, parfaitement, pas une obligation.

They must be parallel and spaced from the dimension "center" yes, but perfectly is not a requirement.

-Hugo

Hi Hugo,

I dropped my helical the other day, and repaired it with hot glue.

I was out flying today and it got hot enough to loosen the glue, so



I flew out over a mile, at about 350' alt. and I was just using the fan stack.

the video started to crackle a little bit at about 5600', but it was real solid,

even at that distance.

I'm still very impressed with this antenna...

-Mike

Yes, the fan stack is one performer. I'm building a batch for a well known vendor...

-Hugo

hugeone, can you shed some light on the dimension of each of the A,B,C,D in terms of wavelength. seems skew planar have each lobe in full wavelength, but the turbine and windmill is less than one wavelength each lobe, any theoretical reason for the design?

There's more coupling between the lobes on my antennas, which need for shorter lobes.
I could have depicted the measurements in fractions of wavelength, but they are just odd numbers with many decimals. You could do it by dividing the A,B,C,D value by the target wavelength to scale the antennas to any frequency. Don't forget that wire diameters will need to be scaled as well.

-Hugo

Originally Posted by Hugeone

There's more coupling between the lobes on my antennas, which need for shorter lobes.
I could have depicted the measurements in fractions of wavelength, but they are just odd numbers with many decimals. You could do it by dividing the A,B,C,D value by the target wavelength to scale the antennas to any frequency. Don't forget that wire diameters will need to be scaled as well.

-Hugo

a lot amazed is how do you calculated the dimension, and determined for best performance.
By simulating software? by experimental test? or by VSWR equipment.
how much is error tolerating on dimension?

asked many question, but your design is so amazing and easy to install on airplane

a lot amazed is how do you calculated the dimension, and determined for best performance.
By simulating software? by experimental test? or by VSWR equipment.

All the answers are correct and in the right order

Tolerances are 1mm on 1.2ghz, half that on 2.4 and I let you guess on 5.8...

-Hugo

Hi Guys,

First 11 pages I've read. The rest I will read later but I will ask now.. maybe someone can help me sooner

First of all I want to say: "Thank you Hugo for your antennas, and is also a pleasure to work with you!!!"

My questions goes here:
- I have several windmill and turbine antennas on 5.8.
- My Tx is 600mw ImmersionRC.
- Usually I cruise at 200ft - 400ft
They perform both great with 5 turn Helical on Fatsharks. I achieved 3km with good video with Human tracking for Helical , further I'm still scared to go because the aiming is not exact .. the plane is not visible after 2km at all.
If I put Turbine on Fatsharks and Windmill on vTx I fly 1km away with some drops. But still flyable. I don't expect more from this setup.

However... I have problems on 1.2Ghz.
I have Turbine on LawmateRX and Windmill on 1000mw LawmateTx.
At 850m the video is very poor with a lot of drops which I don't think is normal. I expected more than 3km on this setup as I achieve 3km with stock Rubber Duck antennas from lawmate both on rx and tx.

Yes, I have ordered Helical for 1.2Ghz already and I'm sure it will solve my problem but I want to understand why my initial setup is not working for me?

If someone have some hints for me.. please help me, poor guy

thanks to you all.

Are your antennas in good shape? Does the center feed is still attached the coax conductor? You should have way more than 850m

Hugo

Try mixing one of your good rubber duckies with each of the other antennas (the windmill or the turbine) and see what your range is like with each. Might help point to one of the antennas being a problem.

Excelent idea.

Hugo

Thanks for the suggestions guys.
The Windmill was broken at the center of the coax feed but I soldered it back, and then fixed iе with hotglue. Turbine is in perfect shape, for sure.
I will do the test and will come back with info.

thanks again