Espritmodel.com Telemetry Radio
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Old Jan 29, 2011, 09:06 PM
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Amherst, VA
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Sarge - that looks great especially for a first antenna! Bending the ends in is fine. geometry on this antenna isn't super critical, but element length is.

You can put it inside a ping pong ball without problems.

I can't wait to hear about the flight tests. Perhaps the next antenna for you is a helical for your RX?

-Alex
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Old Jan 29, 2011, 09:58 PM
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Hey, that would be cool, split a ping pong ball and mount it inside and then glue the ball back together. Kind of like a Doppler Radar ball on the plane.
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Old Jan 29, 2011, 10:23 PM
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It would be nice! The 1280 antenna is just a little big. I wish mine were that size.
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Old Jan 29, 2011, 11:06 PM
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I have made a second one so that I can have the same at both ends. When I do a video shoot I tend to do a whole area at once rather than going for distance, so I prefer omni's over a patch. If I had a tracker that would change the story but not at the moment.

My second one is better than the first in terms of element length and proper angles, I presume that these are more critical on the TX end?
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Old Jan 29, 2011, 11:12 PM
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Can you tell me what 5.8 system you are using and what you thinK? Range, quality, intereference, etc? Are you having multipath probs, thus the CP antennas?
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Old Jan 29, 2011, 11:31 PM
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I'm using the Foxtech 200mW system which is available at a bunch of places under different names. Build quality is good, when it is clear of interference the picture is fantastic. I have heard that 5.8ghz is prone to multipathing so I am going to try these to see the difference. I know that I can often fly through fuzz and get clear picture shortly after. If this is multipathing then the CP's should improve things. Time will tell.

ibcrazy: What should the impedance be on this antenna for 5.8Ghz? I have been warned against using unmatched antennas.
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Last edited by SargeNZ; Jan 29, 2011 at 11:38 PM.
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Old Jan 30, 2011, 02:18 AM
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Germany
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Nice built :-)
I also use the foxtech/sky-rf 5,8Ghz rx/tx combo.
Pretty good in terms of picture quality.

Ahh, and btw: good idea about the pingpong ball.
Will try that as well.
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Old Jan 30, 2011, 04:09 AM
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When the dimensions and shape are correct, the Skew-Planar is a good match for 50 ohm systems.

Nigel.
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Old Jan 30, 2011, 11:51 AM
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Been busy

From left, 2.4-2.5 and 5.8ghz

Mines are built in four pieces. I slot the sma ferule in a + shape, so the wires are held in the slots.

-Hugo
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Old Jan 30, 2011, 07:06 PM
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Hugeone, are you making them to attach directly on top of the VTx transmitter? Does this antenna need any height to avoid the signal being blocked by the batteries and other things on the plane? I had to elevate my V antenna up to avoid blind spots caused by certain gear on the plane.
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Old Jan 30, 2011, 07:13 PM
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Yes, the Vtx will stand upright behind the wing of my TSII. That will place the pin-wheel about 1.5" above the wing.
At 2.4ghz, big batteries can certainly cause blind-spot.
The base station will feature an helix/pin-wheel diversity system and a 5.8ghz Vtx to "re-broadcast" into my AIO goggle that also use pin-wheels.
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Old Jan 31, 2011, 06:40 AM
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Nice work, Hugo. I can't wait to hear your results from the new system.

-Alex
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Old Feb 01, 2011, 10:43 AM
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Found out my AIO goggle and 5.8tx from Foxtech use RP-sma, if anybody want my 5.8ghz pin-wheels just PM me.

-Hugo
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Old Feb 01, 2011, 07:54 PM
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Damn, I would have bought one of your 2.4 ones from you! Sure you don't want to make another 2.4? Your antennas look like works of art.

By the way guys, Dave is doing some incredible tuning work for me on a V antenna. I will do a write up, but he has my VSWR down to 1.02 minimum and 1.04 at 2.432 mHz. Actually he is making that one from scratch.
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Old Feb 02, 2011, 07:33 AM
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Quote:
Damn, I would have bought one of your 2.4 ones from you! Sure you don't want to make another 2.4? Your antennas look like works of art.
Thx
Well, I played with the idea of making some I selling them on my website.
However, I must test them first.

-Hugo
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