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Old Nov 15, 2012, 09:30 AM
Engineer for Christ
IBCrazy's Avatar
Amherst, VA
Joined Jun 2006
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^If it can be soldered it will work fine.
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Old Nov 26, 2012, 02:08 AM
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Joined Sep 2011
165 Posts
Hey guys. So I finished by antennas this weekend. I'm pretty exited to test them out.

Can you please have a look at the pics and confirm if I got the polarization right? I think I built LHCP.

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Thanks
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Old Nov 26, 2012, 12:26 PM
Engineer for Christ
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Amherst, VA
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A tapered microstrip! Beautiful! That's my favorite matching stub. Everything looks great.

-Alex
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Old Nov 26, 2012, 04:23 PM
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northenden, manchester, england
Joined May 2009
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hey guys sorry to sound a proper idiot, i plan on buying a helical and wondering the best position for it, vertical, horizontal or what, i plan to use a CL with it
cheers
carl
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Old Nov 26, 2012, 06:03 PM
Mobius Cables... I got em'
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United States, TN, Oak Ridge
Joined Dec 2011
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doggit,
Helical's have to be pointed at the aircraft or other transmitter.

Chris
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Old Nov 26, 2012, 06:12 PM
Fidler & twidler
empeabee's Avatar
Cranfield U.K.
Joined Mar 2004
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Quote:
Originally Posted by doggit View Post
hey guys sorry to sound a proper idiot, i plan on buying a helical and wondering the best position for it, vertical, horizontal or what, i plan to use a CL with it
cheers
carl
Think of the helical as a gun, firing the signal out of the barrel,
vertical/horizontal is no longer a problem with circular polarisation - like a rifle bullet the signal spins.
Mike
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Old Nov 28, 2012, 08:47 AM
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South Africa, GP, Alberton
Joined Sep 2012
39 Posts
hello all check out the david (rcexplorer) inspired 5.8 helical antenna . i have attached the 3d pdf . im also designing a 6 tune for when i need real punch .

also check out www.jamiedco.com
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Old Nov 28, 2012, 09:45 AM
Fidler & twidler
empeabee's Avatar
Cranfield U.K.
Joined Mar 2004
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Quote:
Originally Posted by jamiedco View Post
hello all check out the david (rcexplorer) inspired 5.8 helical antenna . i have attached the 3d pdf . im also designing a 6 tune for when i need real punch .

also check out www.jamiedco.com
Very pretty, but fact free.
It would be a good idea to start a thread about it, where you can give dimensional drawings, build log, performance figures etc.
I don't think IBCrazy will be too happy to share his thread,
(I could be wrong, you might have already got his permission to post progress here).
Mike
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Old Nov 28, 2012, 10:09 AM
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South Africa, GP, Alberton
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i will be starting a thread but its in the design phase at the moment . i will link the thread once im a bit down the way with the construction of it . i will also share the templates and my experiences .
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Old Nov 28, 2012, 11:34 AM
Engineer for Christ
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Amherst, VA
Joined Jun 2006
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Quote:
Originally Posted by jamiedco View Post
hello all check out the david (rcexplorer) inspired 5.8 helical antenna . i have attached the 3d pdf . im also designing a 6 tune for when i need real punch .

also check out www.jamiedco.com
That design is pretty good structurally. It fixes the breakage problem in shipment and transport. However the construction of that is much more difficult. For a DIYer, the only real gain is the look of the antenna. The performance is going to be exactly the same as the support is not part of the radiating structure.

-Alex
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Old Dec 08, 2012, 12:05 PM
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Czech Republic, Olomouc
Joined Sep 2010
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Subscribed.
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Old Dec 11, 2012, 05:19 PM
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New Zealand, Auckland, Waiau Pa
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Thoughts of a 5.8g 10 turn Helical inside one of those skinny energy drink cans as a directional antenna for finding your lost plane if the video is still transmitting?
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Old Dec 12, 2012, 02:53 AM
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Switzerland, LU, Buchrain
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Quote:
Originally Posted by doonunder View Post
Thoughts of a 5.8g 10 turn Helical inside one of those skinny energy drink cans as a directional antenna for finding your lost plane if the video is still transmitting?
You can supress sidelobes, but I would not do that with a full can. A border half an inch high around the reflector should do better.

Markus
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Old Dec 12, 2012, 03:00 AM
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New Zealand, Auckland, Waiau Pa
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Originally Posted by markus123456 View Post
You can supress sidelobes, but I would not do that with a full can. A border half an inch high around the reflector should do better.

Markus
Thanks Markus, I am thinking it would not be that directional within the last couple of hundred mtrs whatever we do though?
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Old Dec 12, 2012, 03:15 AM
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Originally Posted by doonunder View Post
Thanks Markus, I am thinking it would not be that directional within the last couple of hundred mtrs whatever we do though?
If you have a way to monitor the RSSI value, you should see a clear difference.

Markus
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