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Old Jun 11, 2011, 01:44 PM
FPV from Lithuania
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Lithuania
Joined Mar 2007
128 Posts
http://www.rcgroups.com/forums/showthread.php?t=1377791
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Old Jun 13, 2011, 03:57 AM
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Coil's Avatar
Slovenia
Joined Mar 2008
676 Posts
Here is the distance archived with CL and 5 turn helix with 5.8Ghz 200mW...
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Old Jun 13, 2011, 08:40 AM
Engineer for Christ
IBCrazy's Avatar
Amherst, VA
Joined Jun 2006
10,592 Posts
Quote:
Originally Posted by Coil View Post
Here is the distance archived with CL and 5 turn helix with 5.8Ghz 200mW...
Wow! Nice work! I think you now hold the 5.8GHz long range record.

-Alex
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Old Jun 13, 2011, 09:11 AM
Kiwi in Germany
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Germany
Joined Jun 2010
2,289 Posts
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Originally Posted by IBCrazy View Post
Wow! Nice work! I think you now hold the 5.8GHz long range record.

-Alex
He does indeed. That is a great job! how was the flight. Where did your picture start going south?
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Old Jun 13, 2011, 02:07 PM
FPV Pilot
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United States, OR, Beaverton
Joined Mar 2008
372 Posts
Quote:
Originally Posted by Coil View Post
Here is the distance archived with CL and 5 turn helix with 5.8Ghz 200mW...
Do you just leave the Helix pointing out at the general known direction of the plane and try and keep the plane out in the receiver's "path", or do you manually adjust the helix horn slightly back and forth while you fly?... or both?
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Old Jun 13, 2011, 03:52 PM
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Coil's Avatar
Slovenia
Joined Mar 2008
676 Posts
Thanks guys!

I had a helper that adjusted my receiver antenna to have the best reception possible... picture was crystal clear to about 3 km then started to degrade, good thing about circular polarisation is that picture quality degrade very linear. It is a very predictable system, i will try to make 7 turn helical and push even further.
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Old Jun 17, 2011, 03:32 PM
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NRW, Germany
Joined Dec 2010
272 Posts
Thanks to markus123456!
He builded a CL and a SPW for me (5.8ghz).

Today i was able to test them.
First of all i have to say that the weather was not really good (high air moisture), so i can not tell the maximum range i can get with theses antennas.

I also use the foxtech/bevrc 5.8ghz 200mw system. With the whip on the tx and a 8dbi patch antenna i was flying a maximum range of 1.9km in the past.

Today i flew 1.7km with the CP antennas and i think i can do 2 or 2.5km when the weather gets better.

So i can say it is not worse in max range than my 8dbi patch and there are some other things that have improved dramatically with the CP antennas.
1. I can fly in any direction (with my 8dbi patch, i have to point the antenna in the direction of the plane)
2. almost no distortion when i fly low passes or hard turns (in this category the linear polarized patch antenna sucks)

So i am very happy with these antennas and i am looking forward for new range tests next week (if the weather is better).
Maybe i can fly over 3km if i get a helical for the rx
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Old Jun 17, 2011, 03:40 PM
Kiwi in Germany
whakahere's Avatar
Germany
Joined Jun 2010
2,289 Posts
Quote:
Originally Posted by BKMorpheus View Post
Thanks to markus123456!
He builded a CL and a SPW for me (5.8ghz).

Today i was able to test them.
First of all i have to say that the weather was not really good (high air moisture), so i can not tell the maximum range i can get with theses antennas.

I also use the foxtech/bevrc 5.8ghz 200mw system. With the whip on the tx and a 8dbi patch antenna i was flying a maximum range of 1.9km in the past.

Today i flew 1.7km with the CP antennas and i think i can do 2 or 2.5km when the weather gets better.

So i can say it is not worse in max range than my 8dbi patch and there are some other things that have improved dramatically with the CP antennas.
1. I can fly in any direction (with my 8dbi patch, i have to point the antenna in the direction of the plane)
2. almost no distortion when i fly low passes or hard turns (in this category the linear polarized patch antenna sucks)

So i am very happy with these antennas and i am looking forward for new range tests next week (if the weather is better).
Maybe i can fly over 3km if i get a helical for the rx

They are a lot of fun Helical antennas are great to have. I would go for a 4 - 5 turn one as that will get you at least 4-5km if not more.
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Old Jun 17, 2011, 03:41 PM
Kiwi in Germany
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Germany
Joined Jun 2010
2,289 Posts
Quote:
Originally Posted by Coil View Post
Thanks guys!

I had a helper that adjusted my receiver antenna to have the best reception possible... picture was crystal clear to about 3 km then started to degrade, good thing about circular polarisation is that picture quality degrade very linear. It is a very predictable system, i will try to make 7 turn helical and push even further.
What measurements are you using? I used 13mm spacing and a 16mm wooden dowel rod.
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Old Jun 17, 2011, 05:59 PM
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Joined Jan 2011
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@BKMorpheus : just with cl and spw antennas you should be able to go for mininmum 4 km. with a 5-8 turn helix >5km. but watch out for rc-link (2,4g?)!
i 've been away >5 km, but had to return because of rc-failsafes.... picture was still flyable.

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Old Jun 17, 2011, 06:38 PM
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NRW, Germany
Joined Dec 2010
272 Posts
Hm i will see.

Here is the key cam footage of my test flight:
FPV Rookie - circular polarized antenna test (4 min 32 sec)
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Old Jun 17, 2011, 06:43 PM
Registered User
Alberta, Canada
Joined Sep 2001
1,292 Posts
I started getting some snow in the video @ 1.5 KM or so (ground distance) with 5.8 and 200mw. I'm not sure what the actual 3d distance would be but I was fairly high so at least a little further than that. There were some good rain clouds around and I chickened out once I saw I was looking down on clouds and rain around where I was flying Great views but not so great for keeping things dry.

This is just on the outskirts of town and there are a lot of suspicious towers with various pointy/round bits sticking out all over the place so I highly doubt it is rf clean (I can barely use 72mhz for r/c as there is so much noise and interference - 2.4 ghz is much, much better).
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Old Jun 18, 2011, 07:43 AM
Registered FPVer :)
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Switzerland, LU, Buchrain
Joined Aug 2006
2,854 Posts
Quote:
Originally Posted by Mikey-flies View Post
I started getting some snow in the video @ 1.5 KM or so (ground distance) with 5.8 and 200mw. I'm not sure what the actual 3d distance would be but I was fairly high so at least a little further than that. There were some good rain clouds around and I chickened out once I saw I was looking down on clouds and rain around where I was flying Great views but not so great for keeping things dry.

This is just on the outskirts of town and there are a lot of suspicious towers with various pointy/round bits sticking out all over the place so I highly doubt it is rf clean (I can barely use 72mhz for r/c as there is so much noise and interference - 2.4 ghz is much, much better).
While I agree that being carefull is the right aproach, you should know that usually with CP antennas the signal is never "out" at once. It's normal to fly through areas where the signal is a bit worse and then it returns to normal thereafter. I regularly see this behaviour where say at 800m out I have some grain in the picture shortly thereafter clearing up again. This repeates over a flight of several kilometers up until it really degrades to a degree where it's adviseable to return.

When exploring a new antenna or tx palcement etc, I usually fly out makeing circles at several distance points to also see if the signal will cause trouble because of the plane or parts of the plane blocking it. It's especially important to early check out if returning results in a worse signal than flying out....

Markus
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Old Jun 18, 2011, 07:48 AM
Registered FPVer :)
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Switzerland, LU, Buchrain
Joined Aug 2006
2,854 Posts
Quote:
Originally Posted by BKMorpheus View Post
Hm i will see.

Here is the key cam footage of my test flight:
http://www.youtube.com/watch?v=Ix4DNFHUvs8
Very nice video! :-) Great flight.

Markus
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Old Jun 20, 2011, 05:44 PM
Registered User
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NRW, Germany
Joined Dec 2010
272 Posts
Update!

Today the weather was better and i flew again.
For comparism (all with RC305 and 200mw 5.8GHz):
With linear polarized antennas
my max range: 2.8km with a 11dbi BiLoop and 1.9km with a 8dbi patch
max altitude: 550m

With CP antennas
With the CL+SPW i did 1.7km on bad weather.

Todays results with CL+SPW
range: 2.8km
altitude: 740m (with very good picture)

And of course the CP antennas got way better signal on low passes or behind trees plus they are not directional, so i can fly in any direction.

I really will not go back to linear polarized antennas
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