RunRyder - Spektrum and 2.4G AV Transmitter.

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Aerial Photography and Video > Spektrum and 2.4G AV Transmitter.

Russ Delaney
Senior Heliman
Location: Ashbocking, Suffolk, UK

Anyone done any tests flying with Spektrum whilst transmitting A/V with 2.4g?

Russ

Team Quick UK Pilot 20

09-13-2008 12:58 PM

BigguyOz
Key Veteran
Location: Sydney, New South Wales, Australia

Surely you have been here long enough to know to use the search engine on all the forums. This is a question asked nearly every day.

To save you the trouble. DON'T DO IT, IT WON'T WORK

Tony Stott
Scenefromabove.com.au
13.3m mast
AP hot air balloon
AP kites

09-13-2008 01:45 PM

HOMEPAGE

W4UAV
Senior Heliman
Location: Gainesville, FL

Spektrum + 2.4 video gear = crash.
Try it at your own risk.

09-13-2008 04:29 PM

HOMEPAGE

Renfru
Heliman
Location: Wales

A polite link for Russ may have been more gentlemanly.

09-29-2008 10:56 PM

not103
Heliman
Location: ITALY

I use it.

First i start up the AV downlink and then the spektrum. No problem at all.

I have to check the freq range of AV downlink..

I read that the spektrum dual link system use 2 frequncy, then the AV video trasmit just to one freq, if one signal is lost the rx keep the control by other signal.

here some info from spektrum site:

http://www.spektrumrc.com/FAQ/tm.aspx?m=73

http://www.spektrumrc.com/FAQ/tm.aspx?m=68

More info are welcome.

Roberto - www.heliphoto.it

09-30-2008 12:02 AM

HOMEPAGE

oakley
Heliman
Location: USA

Quote
A polite link for Russ may have been more gentlemanly.

I agree.

09-30-2008 12:18 AM

Rappy 60
Senior Heliman
Location: Houston, Texas

Quote
First i start up the AV downlink and then the spektrum. No problem at all.

Again this all depends on the AV downlink. The problem is that most of the 2.4Ghz radio front ends bleed all over the spekrum frequencies, essentially blinding the receiver. So its really hit and miss, so rather than risk it most people choose a different frequency like 900Mhz or the new 5Ghz.

Dale

Load "*",8,1

09-30-2008 02:27 AM

HOMEPAGE

W4UAV
Senior Heliman
Location: Gainesville, FL

Ok, here we go, gents...again. It does bear repeating, Russ. Hear ya go:
The problem is front end overload. Its real, its not going away no matter what sequence you turn things on. The analogy I use is that its like trying to hear someone talking to you 100 yards away with someone yelling in your ear. The onboard WIDE banded video transmitter in the same frequency range is going to swamp your receiver with RF (radio frequency/energy) while you are trying to communicate with the receiver a half mile away, the video transmitter wins every time, you lose because your range is reduced and your plane no longer hears from your control transmitter and it goes into failsafe.... then crashes or flies away.

Sorry a link wouldnt do it, whoever tells you different is not being truthful, RF is RF, any amateur radio operator can tell you about front end overload.

Hope that helps, I want everyone to enjoy aerial video from their planes/helis, I dont like crashes either.

09-30-2008 03:00 AM

HOMEPAGE

not103
Heliman
Location: ITALY

what about spektrum dual-link system?

If it's work true the AV trasmitter can overload just one channel, but the other one keep the signal from transmitter.

Or not?

Roberto - www.heliphoto.it

09-30-2008 10:41 AM

HOMEPAGE

W4UAV
Senior Heliman
Location: Gainesville, FL

You can have a nine link system, if its near the video tx on the aircraft and on the same frequency band, the range of the receiver will be reduced.
What keeps the second channel from suffering the same front end overload of the first channel? Magic? (Thats a question for Spektrum)
The dual link system is for blocked signals. Since the wavelength of 2.4ghz is so small, something metal or carbon can block its path from the control transmitter. Thats probably why it took so long to develop spread spectrum on these higher bands. So if one receiver gets blocked by something, usually the other one is in the clear and it wont lock out.
Introducing a close RF source to the receiver setup wasnt what Spektrum had in mind when dual-link was developed.

09-30-2008 12:36 PM

HOMEPAGE

BigguyOz
Key Veteran
Location: Sydney, New South Wales, Australia

I am sorry if I seemed impolite before, but really, this issue just won't go away, as for some reason, people seem prepared to risk their expensive aircraft, on a risk which is not all that much different than checking the amount of petrol in a tank by lighting a match to look inside.

Sure you might get away with it for a while, but.....

Tony Stott
Scenefromabove.com.au
13.3m mast
AP hot air balloon
AP kites

09-30-2008 01:41 PM

HOMEPAGE

not103
Heliman
Location: ITALY

I just want to know.

I plan to change my downlink right now to avoid the risk of a crash.

r

Roberto - www.heliphoto.it

09-30-2008 02:03 PM

HOMEPAGE

Russ Delaney
Senior Heliman
Location: Ashbocking, Suffolk, UK

Thanks for all the replies guys, that was the reason i asked the question. Rather than try 1st and then ask why it crashed.
It was a rush question as my AP setup for years has been 35mhz PCM heli and 2.4g video link.
I changed the heli over to Spektrum and have now changed to 1.2g video, with the pan and tilt setup using the old 35meg.
Did the rush job sucessfully.

Team Quick UK Pilot 20

09-30-2008 08:24 PM

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Aerial Photography and Video > Spektrum and 2.4G AV Transmitter.

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