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Old Oct 23, 2009, 07:48 AM
my karma ranover my dogma
galaxiex's Avatar
Edmonton,Canada Eh
Joined Jun 2007
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Quote:
Originally Posted by jetstreaming
Roman, cheers thats great info - the wikipedia link.
This helps ALOT, as I'm currently re-vamping my Ground Station.

I take it a Patch Antenna will also benefit being higher up, for a greater opportunity to have LOS of the plane with no ground obstructions? Hence why you see them mounted at the top of masts - however, contradicting info people have posted here, where its best close to the ground!

It's good close to the ground when flying close in.

Mounting the patch close to the ground helps to avoid multipath reception.
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Old Oct 23, 2009, 07:55 AM
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Quote:
Originally Posted by galaxiex
It's good close to the ground when flying close in.

Mounting the patch close to the ground helps to avoid multipath reception.
Thanks for that additional info Galaxiex.

With the usual Omni / Patch configuration (Omni for close flying) - how high above the ground would be optimum to mount the patch, to take care of longer distance flying?
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Old Oct 23, 2009, 08:07 AM
my karma ranover my dogma
galaxiex's Avatar
Edmonton,Canada Eh
Joined Jun 2007
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Quote:
Originally Posted by jetstreaming
Thanks for that additional info Galaxiex.

With the usual Omni / Patch configuration (Omni for close flying) - how high above the ground would be optimum to mount the patch, to take care of longer distance flying?
Not an antenna expert... but I *think* you want the patch to be near a multiple of the wavelength above the ground.

Could be I have this wrong.... experts chime in?
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Old Oct 23, 2009, 09:31 AM
BEOWULF
North vancouver, B.C. Canada
Joined Apr 2008
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depends on which video tx you are useing 900, 1.2 or 2.4, 5.8

try a search "diversity antenna" or something similar

galax should know I told him 2 times already

Quote:
Originally Posted by jetstreaming
Thanks for that additional info Galaxiex.

With the usual Omni / Patch configuration (Omni for close flying) - how high above the ground would be optimum to mount the patch, to take care of longer distance flying?
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Old Oct 23, 2009, 10:04 AM
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Quote:
Originally Posted by VRflyer
Hueber

wow that's a setup. You sure to take attention when you use that. Question, What you say to policeman if he ask what you are doing? Fly r/c plane for fun
That is a suicide machine that the lipo can bomb your head off, when the plane lost control!
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Old Oct 23, 2009, 11:25 AM
JettPilot's Avatar
Miami
Joined Apr 2005
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Quote:
Originally Posted by jetstreaming

- however, contradicting info people have posted here, where its best close to the ground!
You are correct,

It is better to have your patch higher up, and close to the ground Like was said before, having your antenna higher up gives you better reception as a general rule, but patch antennas benefit from having a ground plane next to them, especially at the lower frequencies ( 900 MHZ !! ). So if you mount a patch on a big tower, it has a nice ground plane behind it, if you mout it on a pole, you do not... I got my best performance and longest range from my 900 MHZ patch by setting it RIGHT ON THE GROUND Get the patch high enough like 20 feet, and it would probably be better than on the ground... On the Car is better also, it gives a the patch aground plane and lets it be 5 feet high or so.. But a patch on a tripod seems to be a real low performance height for them, they dont have a ground plane, but are not high enough to make it worthwile loosing the ground plane...

This is why I have stopped using patches completely , and am now using Yagi Antennas. I can have them on my Tripod and they do not need a big ground plane to work well

Mike
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Old Oct 23, 2009, 11:58 AM
my karma ranover my dogma
galaxiex's Avatar
Edmonton,Canada Eh
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Quote:
Originally Posted by David22
depends on which video tx you are useing 900, 1.2 or 2.4, 5.8

try a search "diversity antenna" or something similar

galax should know I told him 2 times already
Yeah but I don't listen to you because you post so much crap, most, if not all of the time, it's not worth reading.
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Old Oct 23, 2009, 02:29 PM
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Quote:
Originally Posted by galaxiex
Yeah but I don't listen to you because you post so much crap, most, if not all of the time, it's not worth reading.
I thought I was the only one who thought that about Dave22, I put Dave on my ignore list and now all is calm.
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Old Oct 23, 2009, 02:31 PM
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Shikra's Avatar
United Kingdom
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Quote:
Originally Posted by JettPilot
This is why I have stopped using patches completely , and am now using Yagi Antennas. I can have them on my Tripod and they do not need a big ground plane to work well

Mike
What sort of performance increase are you seeing with the Yagi? I'm using patch on a 1.5m tripod and very happy with the quality at 3-4km, but at 7 it's starting to get a tad grainy. Quite happy with that, but if I can improve...
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Old Oct 23, 2009, 04:06 PM
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and another thread goes down the rabbit hole....
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Old Oct 23, 2009, 04:32 PM
BEOWULF
North vancouver, B.C. Canada
Joined Apr 2008
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Jet stream


here is a link for you.
Omni / patch configuration means you are useing diversity.

I use this to position my antennas whether they be omni, patch or yagi.

The centre of a yagi is the collector or right where the cable goes into it.

The height of the patch determines how far and low you can go.

For really long distance low flying it would be up high and close to vertical.


Use a tape measure and postion the omni at a different height but at the calculated distance.

Depending on the video tx you are useing.

works for me

http://www.rcgroups.com/forums/showp...&postcount=989

Quote:
Originally Posted by jetstreaming
Thanks for that additional info Galaxiex.

With the usual Omni / Patch configuration (Omni for close flying) - how high above the ground would be optimum to mount the patch, to take care of longer distance flying?
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Old Oct 23, 2009, 05:19 PM
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Matt Gunn's Avatar
United States, OH, Parma
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So the link you posted to Thomas' explanation states that I should have both Omni antennas on my 900mhz setup .33 meters apart?
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Old Oct 23, 2009, 05:23 PM
BEOWULF
North vancouver, B.C. Canada
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....
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Old Oct 23, 2009, 05:27 PM
BEOWULF
North vancouver, B.C. Canada
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Read Thomas' post more carefully
Quote:
Originally Posted by webdr
So the link you posted to Thomas' explanation states that I should have both Omni antennas on my 900mhz setup .33 meters apart?
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Old Oct 23, 2009, 05:30 PM
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United States, OH, Parma
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Quote:
Originally Posted by David22
Read Thomas' post more carefully
cmon man, no games...do you know?

thats what it looked like it said to me
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