and LP on the ground. Everyone who uses CP on the aircraft uses CP on the ground.
The only time I see em mixed is with LP on the aircraft for lower size/weight/drag (small aircraft)
with CP on the ground.
just use a different channel!
Scherrer has done a test with horizontal polarization on the plane. Doesn't work. No need to repeat what's already been done.
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I use 2370 mhz. The idea was to get further gain in signal to noise ratio when flying in areas pulluted by interference on 2.4 ghz.just use a different channel!
But he did that for 433 mhz RC or for 2.4 ghz video?Scherrer has done a test with horizontal polarization on the plane.
How about this. Get your hands on a spectrum analyzer with a linear antenna, and measure
the noise floor near your chosen frequency with antenna held vertically and again with it held horizontally.
Report back. I'll bet you see very little difference. Certainly not the >10dB difference you think.
Last edited by Daemon; 30th September 2013 at 02:25 PM.
Bumping for more info. Horizontally polarized antennas never became the norm for 2.4 video...are there good references to testing or experiences out there that arent showing up with a search? I've got a 433 dipole that I was thinking of cutting down to 2.4ghz and running horizontally polarized this weekend on the wing paired with a horizontal yagi on the RX.
will do for sure. I cant do much of a scientific test, but I've got a peak that I flew to last winter that I can no longer get to. Its not far at all (~2 miles), but my town is between me and the mountain peak. CP/helical and vertically polarized antennas cant get me there anymore for some reason even though my set up is still working fine for out in the boonies.
I tested CP on the wing with horizontal yagi on the RX and it did seem to work well in a known good area. I want to take that one step further and put a horizontally polarized antenna on the wing so that I don't loose so much signal. I figure a horizontal 1/4 wave dipole on the wing will still give me more power at ~2 miles (even at the antenna nulls) then a low gain CP antenna feeding a horizontally polarized yagi. Lack of other people doing this makes me pretty sure it doesn't work out though lol.
I only had one free flight today for testing and I left my phone on in my pocket haha. The other flights I was getting stepped on by my friend so it will be a few weeks before I can give it a real test
and coming back to this. I've abandoned the horizontally polorized antenna. It just didnt seem to make and improvment and was worse overall I'd say. This may have been from my build job or the nulls pointing at me more often. Either way I'm back to vertical.