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HelicopterAerial Photography and Video › 2,4 downlink and spectrum radios, issues?
11-27-2007 10:32 PM  10 years agoPost 1
daytonabeach

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Oslo, Norway

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Im hearing allot of nice words regarding the spectrum systems, being almost 100% bullet proof against radio interferenes etc.

But what happens if you simultaniously use a downlink which also work on the 2,4 freq?

I also wonder what the best 9-12 ch deals on the spectrum systems would be?

Greatfull for any info on that

Never argue with an idiot, he'll drag you down to his level and beat you with experience...

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11-28-2007 12:33 AM  10 years agoPost 2
wlfk

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uk

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Reports I've heard are they crash.

2.4 Ghz video doesn't interfere with the Futaba FAAST system too badly - though it does reduce the range a bit.

The problem is that the Futaba interferes with the video pretty badly.

K

A bit like a kite, but 500 times more expensive

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11-28-2007 01:35 AM  10 years agoPost 3
GauchoVolador

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Tx

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We´ve Ordered a couple of Xtremepowersystems 2.4Ghz modules/receivers for testing on two backup coptercams, we mainly use 1.2Ghz and 900Mhz for downlink, I will come back with reports about its performance.

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11-28-2007 03:54 AM  10 years agoPost 4
kookboy

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Vancouver, BC

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Alternative for 2.4 ghz downlink?

...and again.

http://runryder.com/helicopter/t343493p1/

... But honey it was only $$$

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11-28-2007 10:23 AM  10 years agoPost 5
Top End

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Darwin

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Why cant we switch on downlink first Then our RC.

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11-28-2007 12:05 PM  10 years agoPost 6
BigguyOz

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Forster, New South Wales, Australia

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Go ahead if you like to live dangerously. There are stacks of posts on all the forums giving details of the potential incompatibility caused by having a 2.4Ghz receiver and transmitter in close proximity. A search will bring up plenty of examples.

Russian roulette anybody?

Tony Stott

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11-28-2007 12:28 PM  10 years agoPost 7
daytonabeach

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Oslo, Norway

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I thought the benefits of the spectrums is that it finds the available freq, wouldnt it be the same if another guy stood 10m away from you also with a 2,4 system?
If not, what are actually the benefits of the spectrum system then?

When reading other posts, i find some that claims its no problem at all, and others tha claim the opposite, who should i trust, and why?

Is it because no one actually knows anything about this, just think they know?

Never argue with an idiot, he'll drag you down to his level and beat you with experience...

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11-28-2007 12:42 PM  10 years agoPost 8
FCM

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Surrey, England

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I thought the benefits of the spectrums is that it finds the available freq, wouldnt it be the same if another guy stood 10m away from you also with a 2,4 system?
That is a different scenario. Placing a 2.4 gig transmitter effectively right next to the helicopter's 2.4 gig receiver may swamp the signal that the receiver 'sees'. If you run two 2.4 gig transmitters right next to each other then nothing bad should happen as they are 'aware' of each other and will actually be on diffeent frequencies.

Your 2.4 gig downlink transmitter is not designed to be compatable with the new spread spectrum or fasst systems. It's signal will not conform to either of these control systems and will be up really close to the receiver.

Yes, people have posted here that they are using the two together without issues but probably as many have also reported problems so it is best to ensure your downlink is something other than 2.4 gig.

Actually, it is not only 2.4 gig spread specktrum control systems that are affected by downlinks. Even an FM receiver has reduced range when placed next to a 2.4 gig transmitter. I have tested this effect and it is repeatable.

Hope this helps,

Paul.

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11-28-2007 01:10 PM  10 years agoPost 9
BigguyOz

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Forster, New South Wales, Australia

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Daytona, I only use 2.4Ghz for my downlink, but would never run the risk of being on the losing side of the argument by finding out first hand if the many posts of problems using 2.4Ghz for both purposes are real. I have read enough to satisfy myself that there is a real risk of losing control of my heli.

Life is too short to become an unwitting beta tester, it is all about risk management IMHO

Tony Stott

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11-28-2007 04:38 PM  10 years agoPost 10
kookboy

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Vancouver, BC

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Previous posts

We've done enough testing using both d/l controls on 2.4 that it's just not safe when compared to 2.4 / 900 or other freq.

After running tests, I would never put the two up in the air together.

Unless I'm running a ship that's 5+ feet in length and can mount them at opposite ends with shielding.
2.4 + 2.4 = not good

900/1.2 + 2.4 = good
Don't use both spektrum AND 2.4 downlink.

Please search in the future.

I don't mean to be an ass but this is an issue that is brought up at least a few times every month in the past 2 years over 3 boards/forums and I can't believe people are still asking it after repeated real-world testing.

When the first batch of DX6's came out, I was fortunate to use it and test it out on the ground and in the air with 900/1.2/2.4 downlinks.

1.2 was moderate. 2.4 cut out and had loss of signal on both systems. 900 was the only one of of the three tested that worked just as well alone as it did paired with the spektrum system.

Please read carefully .

The only way you can successfully run a 2.4 downlink paired with a 2.4 rx on your heli is if the downlink is shielded and at LEAST 28" inches apart from each other.

Even with the above setup, cutout was experienced at 140ft distance.
Or in layman's terms :

The 2.4 downlink will cause the rx to reduce amplification due to load. As a result the range at which the receiver can still see the Spektrum rx's signal is reduced. This has has nothing to do with not being on the same channel.

If you want to experiment on your own and go through what many many people have already gone through, by all means indulge yourself.

Or.. you can go to rcgroups and do a search. Over there, 2.4 and spektrum compatibility scenario has been extensively tested and exhausted.
I posted these not too long ago in the previous countless 2.4/downlink threads.

Either use the advice or don't.

You 'can' make it work, however it won't be foolproof and you will have interference on the ARx000 receiver side.

Jesse

... But honey it was only $$$

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