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HomeAircraftHelicopterFPV First Person View UAS Unmanned Aircraft Systems › Which way to mount FPV antenna
08-26-2013 02:22 PM  5 years agoPost 1
Benth

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New London Ct

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Hi guys I just finished building my first FPV system. It's 5.8 and I have a 600mw TX. I got circular antennas and was wondering where the best place to mount it was. It's going on a MR that will always be well over my head. So what's the best way to mount the antenna above the machine or below and top the dome up towards the sky or towards the ground? Thanks! If there are pros and cons to each I'd love to hear

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08-26-2013 02:57 PM  5 years agoPost 2
bkervaski

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Birmingham, AL, USA

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with the 600mw tx, as far away from you rx as possible, that's a powerful transmitter ..

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

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08-26-2013 04:39 PM  5 years agoPost 3
Benth

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New London Ct

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Ok but that's not really what I wanted to know. My radio transmitter is in the center so I can do far away above or below the machine. Which is better?
Also does anybody know if input voltage affects the output of the transmitter? It can handle from 2S-6S as a input voltage. Does it have a regulator or does it work better with higher voltages?

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08-26-2013 04:57 PM  5 years agoPost 4
bkervaski

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Birmingham, AL, USA

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Ok but that's not really what I wanted to know.
Glad to help

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

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08-27-2013 02:19 PM  5 years agoPost 5
HansAuf

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Gainesville, Florida, USA

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Input voltage will not affect the transmitter output. What kind of antenna are you using. If you are using the immersion or a knockoff brand circular antennas mounting the one on the multirotor underneath will get you better results.

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08-27-2013 02:38 PM  5 years agoPost 6
Benth

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New London Ct

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I do have the immersionrc circular polarized antennas. So mounting underneath the multirotor gives better reception? Do you point the top of the dome up, down,or sideways? Also are the immersionrc circular antennas and good? I popped the cap off one to look and it's clearly just a real cheap stamped copper element. Are there better brands out there. They seem good enough to use for now but at some point I will probly want better ones. Thanks!

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08-27-2013 04:14 PM  5 years agoPost 7
Timbers

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Wisconsin

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Real Answer
What kind of multirotor do you have?

I have a Flamewheel F450. I had my 600mw TX mounted up near the rest of the electronics with the antenna up in the air and video was terrible.

I ended up buying some landing gear struts for the thing so it stands off the ground about 8 inches. I then mounted the TX down low with the antenna up. Video is crystal clear now and I get perfect range without cutting out.

So I'd mount it under the copter. The thing flies above you anyways, so if its under the copter there isn't any part of the copter between the transmitter and your receiver.

I had to make a little plastic mount and zip tied it to one of the struts. I'm including a picture.

...Tim

You fly RC helicopters? Can I have a ride?

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08-27-2013 05:38 PM  5 years agoPost 8
rexxigpilot

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Florida

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If you always fly over your head, mount on the bottom for sure! The signals are all high frequency and are line of sight. Anything in the way of the sight line will seriously reduce your range.

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08-27-2013 07:24 PM  5 years agoPost 9
Benth

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New London Ct

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My machine is a DJI 550 with a Alware brushless gimbal and the "advanced" landing gear that came with the gimbal. I should have no problem finding a good spot to mount it. So these things really are line of sight only? So if I stood in a big clearing and went over the trees at the edge ill lose signal? Or if standing at the bottom of a cliff it's ok to up to the top of the cliff but I can't go forward out if sight very far before I lose video? Thanks guys!

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08-28-2013 02:37 PM  5 years agoPost 10
rexxigpilot

rrProfessor

Florida

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Benth, you will lose signal strength whenever you go out of sight. The radio waves can bounce off of objects to give you some signal when out of sight, but the radio signal strength you get is very specific to the surrounding area. For instance, mountains and buildings are good reflectors of radio waves, so you may not lose the signal in your cliff scenario depending on what's around you.

Also, polarized circular (cloverleaf) antenna are more directional than a standard dipole antenna. This provides more gain or signal strength than a dipole, so the range is greater. But polarized circular antenna reject (not pick-up) bounced signals much more than a dipole. It's a trade-off.

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08-28-2013 03:28 PM  5 years agoPost 11
Timbers

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Wisconsin

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Ya
Yah, if one or two trees gets between me and my 600mw 5.8ghz TX you will start to have the video cutout. You can still see pretty well and fly, but it goes in and out to the point where its not really fun to be flying anymore with trees in the way. You would completely lose video if you flew beyond the cliff that you are talking about.

You fly RC helicopters? Can I have a ride?

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