Here is a nooby question... is this better than a cloverleaf? what advantage does it offer over a SPW/cloverleaf combo? what do more blades do? Won't more change the impedance and mess up the SWR? whats the advantage with like 8 blades? Is this the same as a turbine antenna? What is the radiation pattern?
Question rant overI might build one because they look nice... thanks
It have greater than 0.9 axial ratio, the more the blades the more uniform is the radiation pattern and the axial ratio up to 8 blades.
If you take a virevent and just add blades, swr will be messed up, you need to adjust blades length and pitch for each added blades.
So i used my FAN / Cloverleaf combo the other day and was getting a blackout at about 650ft over a harbor with my tricopter. What should my range be on this on the edge of a city? The signal looked fine then all of a sudden blackout. for about 2 seconds, then it was back. Pretty scarey over water with a multi-rotor.
http://maps.google.com/maps/ms?ie=UTF&msa=0&msid=
207357220625936188957.0004c12739d64957932de
There is something that I have always missed from the people/ companies who make this antennas: they don't know the limites of their creations, they don't have testers who can take the antennas to the limits, so we could know what to expect from this antennas in real world, not on the paper.
I still remember when they said circular polarization is not for long range. Then I went to 30 km with my helical and cloverleaf. Later, Roberto went to 71 km!( and today to 100 km), with Sircana's antennas.
So I decided to try this antennas made by Hugo. Two days ago I made a windmill and today in the afternoon, I went to fly.
I didn't had time to install my ground station with the skylark tracker, so I used a pinwheel for the receptor and another pinwheel in the plane.
I wanted to know How far I could go this way. I have been flying very low lately ( 4 m of height/ 7,8 km away), so I tried to go as low as possible while going away. The results where amazing, I went to 4,5 km at 9 meters of height, Then 6,5 km at 15 meters of height, and finally, because I had no place to fly low further than that, I went to 10 km at 50 meters of height. The image was complitely perfect at this distance, cristal clear, but I had to come back because of the battery.
SECOND TEST:
Then, after coming back to my flying field I change the pinwheel on the plane for the windmill, and went again to the same places. BUT this time, the results where even more amazing. I was thinking that with the windmill I could never repeat this distances and height. But I was wrong. I was able to fly at 4,5 km at only 6 meters of height, and 6,5 km at only 9 meters!!!!
Even better than with the pinwheel!!
I had to come back at 7 km because the battery I was using this time was smaller than before.( sorry but I could never imagine that this antenna was going to be better than windmill)
I still have pending a range test with the windmill, I also went to 15 km with two pinwheel, but I had no time to try with the windmill. I will, and I will tell you the results.
Congratulations Hugo, you probably know this, but your antenna is just wonderfull.
Now I want to test the turbine as a receptor antenna, and also as a transmiter antenna. I am the kind of person who likes to confirm the information by myself. And I want to see if Windmill is really better than turbine as a transmiter antenna. For some reason I think the turbine is at least as good as the windmill as a transmiter antenna.
We will see, I have to make a turbine.
Last edited by catamar; 30th May 2012 at 03:47 AM.
Black out mean a loose camera wire or Vtx, lost of RF signal turn into snow, not black image.Originally Posted by slowjet
Catamar,
Thx for your testing, I take you use a 1.2Ghz link. Before releasing my antenna, I been sure to put them trough good test. Instead of flying for great distance I installed a 15db attenuator on my 500mw Vtx. With only 16mw left, you run into limits much quicker
-Hugo
Hugo, have you tested the turbine as a transmiter antenna?
yeah I did use it a lot, it have a more uniform radition pattern and it show only at the very limit of your link if at all.
Hugo
Last edited by HugeOne; 29th May 2012 at 06:29 PM.
if using the turbine,
whats a good match on the TX,,
thanks
john
Windmill/cloverleaf/SPW
Hugo
on my homemade goggles black screen is total loss of video signal ie complete static. it happened one other time to me i was flying with my helical in the backyard and clover on the tri and was out about 1200ft on the other side of my house. i dropped too low and my house blocked the signal.
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