RunRyder RC Helicopter Topic - interference by video link?

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Aerial Photography and Video > interference by video link?

blazek
Senior Heliman
Location: Greece-Athens

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Hi guys
I was wandering if there is a possibility to have interference to the receiver from the video link…if so what is more popular to use PCM or FM to the transmiter?
Any advise would be appreciated.

02-17-2004 Over year old.

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Helicek
Senior Heliman
Location: istanbul - turkey

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Hi,
I use PCM receivers on my gasser camcopter helis. I have never had video down link related interference. I don't think an average down link can hurt your receiver at all.
What type of helicopter are you flying(gas/glow)??=
What do you exactly have for video down link??=
Downlink frequency??=
Location of downlink antenna??=
Location of receiver antenna??=
Ahmet

02-17-2004 Over year old.

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blazek
Senior Heliman
Location: Greece-Athens

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The fact that I posted this text is that the weekend before the last one in a fan fly that we had I tried to setup a micro cam that a friend has in my glow ergo 30 to shoot some videos. My ergo30 uses FM frequency in the transmitter and the result was amazing as it was my first try… J after that we tried to set it to a raptor 60 that use PCM so we could record some 3d flying. When it was lift of in about 30 feet up, the transmitter was locked out and as a result to clinch in the entire means to the ground. As you understand the crash was heavy, and the one who had the heli said that, that
become from the video link….
I am not sure but the frequency is 1.4 Ghz in the video link and the crystals that the guy was using I thing that they are in 75

02-18-2004 Over year old.

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Helicek
Senior Heliman
Location: istanbul - turkey

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We have had PCM receivers lock to crash our F3C helis. It is very difficult to diagnose such failure. Are you sure you were not hit? You will probably won't be able to make the range check, but just have that in mind for next time.
Carbon tail tubes and tail rotor belts also can be a nuisance at times. This combination can produce static electricity buildup which effects receivers very badly, PCM/PPM dos not matter.
Better luck next time!

02-18-2004 Over year old.

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daggit
Elite Veteran
Location: Waseca MN

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I'll jump in here.

I run a PCM on my camera heli but the pan/tilt unit underneath runs on a seperate FM Rx. I have had intereference from the downlink to the pan/tilt FM unit but never to the heli's PCM reciever. This was not caused by the downlinks signal though....

On the occasions where this happened it was a wiring issue. On my setup the downlink runs on 12v. Running 12v wiring too close to the Rx anteanna will cause glitching.

It would be best if you can keep your camera's power supply and wiring away from your heli's wiring and rx antenna... or shield it somehow

02-18-2004 Over year old.

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blazek
Senior Heliman
Location: Greece-Athens

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``Are you sure you were not hit? You will probably won't be able to make the range check, but just have that in mind for next time.’’ The true is that we had a range check before we fly anything and we didn’t had any interference.

``On the occasions where this happened it was a wiring issue. On my set-up the downlink runs on 12v. Running 12v wiring too close to the Rx antenna will cause glitching. It would be best if you can keep your camera's power supply and wiring away from your heli's wiring and Rx antenna... or shield it somehow’’

In the camera mount that I am finishing right now, which is based on airfoil’s and aggelos mount and I am thinking of putting the Rx case and the video link at the back of the unit and at the center to make a case for the batteries so I could have the same rank with the video camera. Could it be possible to have any interference to that?

02-18-2004 Over year old.

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Helicek
Senior Heliman
Location: istanbul - turkey

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Blazek,
Range check whatever is flown under the similar conditions(engine running, downlink on, camera on, and etc). if you are going to get interference from downlink you will get it no matter. If radio locks in the middle of flight I would look elsewhere. Good Luck.
Ahmet

02-18-2004 Over year old.

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ELOSSAM
Veteran
Location: Es

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Same as Daggit. In my case have tested either 350mW and 1200mW video TX close to my ppm receivers and never noticed any glitch.
Both TX working at 2.4ghz and the ppm receivers at 35 mhz
You can see here how close the TX is from the receiver.