Right guys.
I flew one of these today.
http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=11_45_49_97&products_id=2557
This is one seriously good antenna!
I flew with it attached direct to my goggles. The 80 degree beam is wide enough to keep the model tracked by turning your head.
I found overall, the fade out when moving out the beam predictable, and the overall quality of the video superb! I only took it to 2km, but has no appreciable loss in video.
If I could fault anything. It feels DIY.
For the the price, a professional plastic case would have been nice. The one it comes with is ok, but feels like it was mad by someone in their garage.
But.... I will forgive that small issue because it works so well :-)
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no offence - but taking a 13dBi out to 2km is like judging the high speed handling of a sportscar at 35mph.
So far that only proves, that the antenna isn't completely broken.
True.
However I an say that in terms of could depth and signal quality it beats the fpvlr parasitic disc that I have.
I flew that too - you could feel the difference.
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well not much if you compare a parasitic disk with only 9 dbi to a 13 dbi antenna.
What about a 8 turn helix? That would be a fair comparison.
Also I want to tell 1 thing. You can't get 13 dBi and 80° beamwidth...
those 2 things are not compatible... simple math
80° beamwidth is typical for a 7dBi antenna.
So either 1 of the 2.
My spironet patch is apparently 13dbi and the beamwidth is just 30 degrees. Good for 7km, always used to hit a lot of noise beyond that. I never really pushed it that much but some people are going 15km with 13db helical so in even skeptical that the spironet patch is even a true 13db.
Quote from: KondorFPV on April 04, 2014, 04:30:38 AM
Also I want to tell 1 thing. You can't get 13 dBi and 80° beamwidth...
those 2 things are not compatible... simple math
80° beamwidth is typical for a 7dBi antenna.
So either 1 of the 2.
I think that the point here is that the a poach with the parasitic disc type antenna is different.
They seem to be upping gain, whilst keeping wide.
No expert on this myself - so just going on what the docs and charts say. All can be found in the lab!
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You can't give more gain without making the beamwidth smaller...
That's a myth. Remember there is no such a thing a "gain" that comes from nowhere.
An antenna with a gain of 0 would be an Isotropic antenna, which is a perfect sphere of coverage area.
Now that antenna unfortunately does not exist in real life, as even a low gain omnidirectional will have nulls top and bottom along the vertical line.
Now what you can do is remove coverage from one area and add it to the other, but total volume stays the same.
A 1 dBi antenna has the same VOLUME of coverage of a 20 dBi antenna.
Thing of gain as a water filled balloon about the size of your closed fist.
NOw you can modify its shape but not its volume. You can make the balloon long and thin (high gain) by pinching 2 opposite ends of the balloon and pulling hard, but you won't have 80° angle.
You can't create "gain" out of nothing, that's what I am saying. Simple concepts really.
So please beware of people offering very high gain with very wide beamwidth, it just does not happen.
Or you will have wide beamwidth on the horizontal plane and very narro beamwidth on the vertical plane, but you still need to remove from one place to add to another.