Tandem Flight using a single RMILEC NB20 LRS

by Zatoichi | February 22, 2014 | (6) Posted in Reviews

RMILEC NB20 20 channel UHF LRS

This article shows how one RMILEC NB20 TX can control more than one craft at the same time.

 Using two NB20 RXs,two Frsky RXs and two 9X TXs;two planes can be flown using the same 433 signal.

One RX uses channels 1-10. Another uses channels 11-20.

It is surprisingly easy to do this. We took no speical precautions in setting this up other than basic failsafes.

This is a VERY interesting UHF LRS! 

Remember to check your local rules and regulations before using this system. In most countries a license is required to opperate on these frequencies. An attenuator can be used between the transmitter module and the antenna to reduce the output power if needed.

 

Thanks to the people at Foxtechfpv.com and RMILEC for sending us this for testing.

 

Click here for more info from Foxtechfpv.com


More to come!

Stay tuned in.=)

- Find this article & others like it at www.FliteTest.com -

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COMMENTS

kk4gt on February 22, 2014
I would hope for your sake that both pilots have a ham radio license, being a ham for 50 years you are right when you say special license.
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jhitesma on February 22, 2014
I could see a case for it being legal with just one licensed operator. You're basically just passing traffic for the second pilot. Not all that different than running an autopatch for or handing the mic over to a 3rd party. As long as the licensed operator maintains control of the transmitter. I can't think of anything in part 97 that would require the second pilot to be licensed since he's not actually in control of the 440 transmitter. He's only transmitting on 2.4 and the primary operator in control of the 440 radio is relaying the other pilots signal.

But this feels like the kind of thing that could lead to an hours long heated ragchew with no one convincing anyone else that they're right or wrong :)

-N8INJ
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Zatoichi on February 23, 2014
See, we were thinking along these lines.It sounds like you would be passing traffic for pilot #2. Either way we are both HAMs so..=)
-KF5ZUD
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Zatoichi on February 22, 2014
Yes sir.Both pilots are fully licensed HAMs.
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Bob_Curtains on February 23, 2014
Nice flying and video Zatoichi!
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Zatoichi on February 23, 2014
Thanks Bob. It was windy as all getout. =P
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kah00na on February 22, 2014
This video is sweet! I saw this TX/RX combo had so many channels and was wondering if this was possible. You can save some money by not buying multiple transmitters. I don't know of a reason you couldn't fly more planes with it! I was seriously thinking about buying this and now I may have to break down and get it. Thanks for sharing this!
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Zatoichi on February 23, 2014
Thanks Kah00na. If you download the NB20 manual, it mentions "Only CH3 and CH13 can be configured to throttle channel.If you want to use other channels to control the throttle,
please handle it with caution. You should correctly set failsafe of R4047NB20 to avoid accidents."...So it sounds to me like you can use another channel for throttle but you must be cautious.If you and three buddies are planning on having a race or something, you want to do it out in a safe place and set your failsafes.

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kah00na on February 23, 2014
Good enough. There is only one other RC flyer in my family.
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Zatoichi on February 23, 2014
=) Ditto mate! It is working for us so far.
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casehatter on February 22, 2014
Sorry but I'm confused what is the purpose? I'm just not getting it Blonde moment...??
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Zatoichi on February 22, 2014
Toasty warm pylon racing... Formation flying... I can think of a few others.
It is just another interesting feature of this system.The 20 channels would be ideal for aircraft with a co-pilot cameraman operating a gimbal or camera functions while the pilot just flies.
ZAT.
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casehatter on February 22, 2014
I hear ya that is a nice feature. I've switched from 400 to 72 and a amp that'll take ya where ya need to go since nobody useing it any more. and my plain 72 I've reached over a mile with no help. I could add my 2.4 with my 72 am band and fly over 16 channels but I've use my eagle tree and plane set up and only used 8 but had no retracts or any thing.. All the gimble stuff is going to be the rage now I guess I wonder about some of the stuff and I buy it then sometimes wish I hadn't..!!
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Zatoichi on February 23, 2014
We are looking into gimbals,Case.There are quite a few to choose from. It seems to me that you want to get a nice controler board for it. Sounds like 72 is playing well with your video.This rocks!=)
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casehatter on February 23, 2014
Yeap having fun and that's all that counts, was at the field for 6hrs.today, to windy for FPV so no footage but fun was had..!!
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Zatoichi on February 26, 2014
Glad to hear it ,buddy! It makes me feel good to know that you are flyin over that pretty town of yours.=)
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rcspaceflight on February 22, 2014
I think the point is that you don't have to worry about two planes Rx systems interfering with each other because both planes are using the exact same signal/wave length.

I thought the video was going to be two planes with the same pilot. Not two planes, two pilots, and one system controlling both planes. Which seems like the exact opposite of having redundancy. If a problem arises with the Rx system, then both planes crash.
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Zatoichi on February 23, 2014
Yes if a problem arises with the Tx system you have two planes go to failsafe.That is why we are testing it. The system is either solid or it is not. For us,so far,it has been very well behaved.
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Zatoichi

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Tandem Flight using a single RMILEC NB20 LRS