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Old Apr 09, 2008, 11:41 PM
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Flying several FPV planes at once

Am I correct in understanding that if I had a Spectrum radio and a 900 mHz system and my friend had a 72 mHz radio and 2.4 gHz system that we wouldn't be able to fly at the same time without fear of interference?

What if we both had 900 mHz systems? How many 900 mHz systems can fly at once?
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Old Apr 09, 2008, 11:54 PM
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Technically only 1 frequency is allocated to 900mhz usage in the US. That's on Channel 1. There are 3 other channels that are on the TX and RX but they are outside the allocated frequency range.

I'll leave the legality up to you
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Old Apr 10, 2008, 07:48 PM
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So, that makes FPV combat very difficult, huh?
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Old Apr 10, 2008, 08:33 PM
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You could go with a camera on 900mhz and another one on 1.3ghz
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Old Apr 10, 2008, 08:58 PM
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Quote:
Originally Posted by wmacorlando
Am I correct in understanding that if I had a Spectrum radio and a 900 mHz system and my friend had a 72 mHz radio and 2.4 gHz system that we wouldn't be able to fly at the same time without fear of interference?
We've done this and it works ok. I think as long as the planes stay a few feet apart and also you don't stand right next to your buddy, your fine. I also use this set up with 2 RC trucks .
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Old Apr 11, 2008, 06:57 AM
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Make sure you setup the ground stations with a little space beween them and stagger the takeoffs and landings. 25 to 50 feet spacing between the video rx's on the ground seemed to work well.

The interference only really occurs when both planes are in close proximity to the ground stations.

I try to stay ready for a switch to visual contact when my buddy comes in for landing.

We had a few instances when one plane landed the video downlink for the plane still in the air was interupted.

It's not too bad, just be prepared for the unexpected for the first few flights until you work out a routine.




We also spaced the video channels as far apart as possible.
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Old Apr 11, 2008, 11:37 AM
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Quote:
Originally Posted by wilkyz
The interference only really occurs when both planes are in close proximity to the ground stations.

Not at all, when both planes are close to the rx´s you may have a short interference, but the problem comes when one plane is flying some hundred meters far and the second fpv make a low pass or land near the ground station. That´s a problem! (don´t ask the how did I learn it )
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Old Apr 11, 2008, 07:14 PM
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You're right. I meant to say either plane, not both. I had a few tense moments when my buddy landed close to my vid rx while i was still flying. The hardest part of fpv for me is remaining calm when the video goes bad. If you're out of visual you just have to stay calm and not make any hasty decisions.

Quote:
Originally Posted by AndrésMtnez
Not at all, when both planes are close to the rx´s you may have a short interference, but the problem comes when one plane is flying some hundred meters far and the second fpv make a low pass or land near the ground station. That´s a problem! (don´t ask the how did I learn it )
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Old Apr 11, 2008, 08:29 PM
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Keep in mind that 2.4Ghz video is only half the problem.
The bigger problem is 2.4Ghz RC Tx's near your 2.4Ghz video Rx.
Anything on an overlapping channel will thrash your video signal
when they walk near you.

That's why I'm in the process of switching to 900Mhz right now,
because I'm intending to fly FPV at an event where they
will be 20-30 planes in the air at once, many of them
on 2.4Ghz spectrum.

ian
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Old Apr 11, 2008, 08:34 PM
Fly FPV, sleep; repeat
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Quote:
Originally Posted by Daemon
...I'm intending to fly FPV at an event where they
will be 20-30 planes in the air at once...

ian
Can't wait to see the video of THAT!!
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Old Apr 11, 2008, 10:55 PM
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Quote:
Originally Posted by twinturbostang
Can't wait to see the video of THAT!!
Nor can I. It's a combat event so we put 20+ planes in the air
at once and then crash em into each other. Last year we introduced
everyone to DS combat which is faster, and more brutal.



ian
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Old Apr 12, 2008, 01:46 PM
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Are all those planes FPV??? That's what I'm talking about - FUN!
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Old Apr 12, 2008, 03:46 PM
Fly FPV, sleep; repeat
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Quote:
Originally Posted by wmacorlando
Are all those planes FPV??? That's what I'm talking about - FUN!
Do you see goggles on all those people?? Sorry, just poking a little fun there.

To answer your question, no, all of them are flying line-of-sight. Slope combat is a lot of fun. I've only had the chance to do it a couple of times (and only with 2-3 others in the air at the same time). But it's definitely an experience every RC pilot should try some time. The thing that always gets me is you get to "fly for free". There's no motor on those planes, and it's really cool to stay up in the air for 10, 20, etc. minutes without any power.
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Old Apr 12, 2008, 07:17 PM
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Flying slope is so relaxing that even an electric motor becomes an annoying noise

And a slope combat is a blast, heck I miss it!, I wish I would have a slope closer to my house.

This is one of the drawbacks of FPV, we can´t fly more than 3-4 planes at once...
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Old Apr 12, 2008, 07:25 PM
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Well, all of them have their backs turned and the one guy who's turned slightly looks like he may be wearing goggles. Plus, Daemon mentioned in the post that he'll be in the air with 20-30 other planes.

There's got to be a way to get a dozen or so FPV planes in the air at once.
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