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Old Feb 02, 2011, 09:26 PM
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Hugeone, have a look at Digikey.com for an adapter part number ACX1248-ND (CONN SMA ADAPTER JACK-R/P PLUG; Amphenol; 132171RP-10) that may solve your SMA connector issue on your AIO goggles and 5.8GHz Skew-Planar Wheel.

- Marc
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Old Feb 04, 2011, 08:19 AM
RC = FUN
Fort Wayne, Indiana
Joined Aug 2008
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Wow I feel really dumb....

from the first couple of pictures I was thinking that this antenna would be slightly larger than a softball, but you guys on 5.8 are making them the size of golf balls!!!!

If I made one for 1.2 would it still be about that small, or a lot bigger? -Tyler
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Old Feb 04, 2011, 09:27 AM
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Look up a few posts and you will see my esitmated measurements of my 1.3 version, and a few pics of it on my easy star.

It is relatively big, but not unweildly.
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Old Feb 04, 2011, 09:28 AM
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Ah, here it is compared to an E*

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Old Feb 04, 2011, 09:30 AM
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Or check the video. I fly a 1.3 GHz skew planar wheel. It is about 4.25" in diameter and 2" tall. About half of a softball for 1.2/1.3 GHz.

It is a bit draggy, but well worth it for the performance.

-Alex
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Old Feb 05, 2011, 01:36 PM
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Alex,

I've been reading this thread over. Question on the CP VTx antennal. Do you need a CP VRx antenna to match or will it work with a regular patch? Reason I'm asking is I see talk on the VTx side but not much in how to construct a CP VRx antenna.
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Old Feb 05, 2011, 01:42 PM
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I know you Q is aimed at Alex, but...Did you see the helical tutorial in his blog?? It is very easy Vrx antenna. Also you can use the SP antenna as RX too! I built both but weather has been very bad so I have done very little comparisons with conventional antennas.

Either way the CP can communicate with a linear antenna, you just get 3dbi automatic loss, BUT it is constant and not dependant on Vtx orientation. This is the reason it was recommended in teh past by Schrerrer (and probably others) to use a CP antenna as Vrx and linear one the plane (for convenience and since CP Vtx are rare) unless going for maximum distance, since in hard banking you do nt approach a huge dbi loss, just 3.
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Old Feb 05, 2011, 01:43 PM
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Quote:
Originally Posted by Derek_S View Post
Did you see the helical tutorial? It is very easy Vrx antenna. Also you can use the SP antenna as RX too! I built both but weather has been very bad so I have done very little comparisons with conventional antennas.

Either way the CP can communicate with a linear antenna, you just get 3dbi automatic loss, BUT it is constant and not dependant on Vtx orientation. This is the reason it was recommended in teh past by Schrerrer (and probably others) to use a CP antenna as Vrx and linear one the plane (for convenience and since CP Vtx are rare) unless going for maximum distance, since in hard banking you do nt approach a huge dbi loss, just 3.
No, I'll search for that though...thanks.

Found the thread. Thanks, I'll take a read through it.
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Old Feb 05, 2011, 01:45 PM
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BTW, I did fly enough with the CP stuff to try it with CP on the plane and Linear patch on the ground, performance was ok, certainly not comprimised enough to be noticed by me, or perhaps much at all for < 1mile flying that I do.

The helical is in his blog. it is easy and cheap to construct, and looks wicked cool IMO.
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Old Feb 07, 2011, 11:55 PM
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SWR 1.3 - Not bad

I just got my new directional wattmeter up and working. I found out there is a huge HAM supply house just down the street from me! I was using a 700mW BoB TX for the measurement on a 3S Lipo. I'll let the picture say the rest.

-Alex
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Old Feb 08, 2011, 06:52 AM
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Old Feb 08, 2011, 08:12 AM
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I found the exact same thing last night. I got best results with that angle at exactly 90 degrees. Admittedly, the best VSWR I can get appears to be 1.2. But I'm happy with that. I can't sweep the whole frequency except in steps and then I'd have to graph it manually.

Let me know how much the styrofoam shifts the frequency. I have been considering a few different protection methods. Does anyone know of a cheap plastic ball that could be sliced in half to cover the 4-1/4" radius of the 1.3GHz antenna?

-Alex
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Old Feb 08, 2011, 08:30 AM
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Old Feb 08, 2011, 08:41 AM
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Hi Mictronic , what kind of tool do you use to analyse the antenna ?
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Old Feb 08, 2011, 08:50 AM
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