Re: [Paparazzi-devel] Re: Does the modem interfere with 2G4 radios?

[Andrew S]

Hello
I flew many times in same time with 2.4 radios without any problems.
Ive got xbee24pro - 100mw and x24-019 with 50 mw


13.07.09, 22:34, "Martin P" <address@hidden>:

> Hello,
> yesterday I did some ground testing on the RC flying field. I am the only one 
> who uses an autopilot. I had warned the other pilots that I use 2G4, just in 
> case. One guy who was flying a Funjet suddenly shouted that his plane doesn't 
> react any more, so I quickly disconnected the power supply of my aircraft and 
> the USB cable of the ground statiion modem. Then he didn't have any more 
> problems and was able to continue his flight. 
> I am using 1mw Xbee ZB modems. He flew with Futaba FASST. 
> He is not 100% positive that actually there was an interference, it all went 
> very quickly. He took off while my modems were powered on. My ground station 
> was behind the safety fence (metal), the plane was parked on the actual 
> flying field. To me it looks as if an interference occurred when his plane 
> came in unobstructed line of sight to my ground station. It has been in 
> unobstructed line of sight to my to my plane all the time. 
> My ground station modem is configured as coordinator, the other one is 
> configured as end device. In the plane I use a Nintendo antenna for the 
> modem. 
> What did you experience? 
> Greetz, Martin 
> --------------------------------------------------------------------------------
> From:  chris 
> Subject:  [Paparazzi-devel] Does the modem interfere with 2G4 radios? (Martin 
> P) answer from Chris Efstathiou 
> Date:  Sat, 07 Mar 2009 19:54:22 +0200 
> User-agent:  Thunderbird 2.0.0.19 (X11/20090105) 
> Hi.
> I have recently equipped my Multiplex profi 4000 with the ACT S3D dual FHSS 
> system http://www.acteurope.de/html/start_english.html
> I only have one flight with it but a lot of ground testing and i am almost 
> certain that there is no problem operating a FHSS system like the s3d or the 
> Futaba FASST in close proximity with the Xbee 60 mw 2.4 ghz modem.
> The separation of the s3d dual receiver and the Xbee modem is about 60 cm (~2 
> feet) on my Multiplex EasyGlider and the range is not reduced at all during 
> flight and during range checks.
> After all operating both a Xbee 2.4 ghz modem and a FHSS system is like 
> having two pilots flying two airplanes at the same time, one equipped with 
> say a Spectrum or JR system and the other with a Futaba FAAST system, a 
> rather usual situation.
> Chris
> --------------------------------------------------------------------------------
> From:  Martin P 
> Subject:  [Paparazzi-devel] Does the modem interfere with 2G4 radios? 
> Date:  Sat, 07 Mar 2009 12:16:28 +0100 
> Hi, everybody! 
> I would like to know if anyone has experience with Paparazzi and 2G4 
> transmission. I do not intend to fly Paparazzi with a 2,4GHz safety link, but 
> as 2G4 becomes more and more popular, I would fly near other people who use 
> 2G4. I don't want to cause a crash. 
> Theoretically, it should not be a problem as the 2G4 radio should hop to 
> different channels and the interference should be very short. Unless the 
> modem uses too much bandwidth. 
> On the other hand, I would like to know if the modem works while a 2G4 radio 
> is near. 
> Greetings, Martin 
> _______________________________________________
> Paparazzi-devel mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/paparazzi-devel 
--
Новая почта пришла http://mail.yandex.ru/promo/neo/welcome/sign