Hello All:Anyone has experience using Xbee 868 modem in an area where GSM 900MHz cellphone-band is used? I m wondering whether there will be severe interference problem since 868MHz is quite near to 900MHz?Another problem is is XBee 868 really with that super long range (I mean, 4Km)? I did a test and seems around 1km, signal strengh is already obviously reduced.Thank you for all suggestions.Alex

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • Earl,

    i think you have hit on somthing here, that im also not sure of...

    in a rash moment, i aquired a 2w 868 - 950mhz Vtx, and we also have a 1w Data 900 mhz Tranceiver.

    If the Vtx was set to 868 or 950, do you recon that it will bleed all over the data?

    We have used both with success but not together, (always testing somthing new and not putting them together as we originally planned)

    is there enough room to stop the bleed over?

    no expert on Radio systems

    Doc.
  • Hi,
    are you meaning use 868MHz XBee for Ardupilot telemetry download?
    There was a discussion here some time ago, because it seems they don't work for this. They have a duty cicle of 10%.
    Is there anyone using them successfully?

    Ric
  • I think there's no interference between GSM and ISM 868 bands. In Hungary we use GSM cellphones and you can buy 868 MHz radio modules.
    The datasheet says that 40 km is the outdoor, line-of-sight range of this radio. In urban conditions it's about half a kilometer.
    My further question:
    what about 868 MHz ZigBee + 1,3 GHz video downlink? (868*1,5=1300)
  • GSM 900 has a bandwidth of 50 MHz: 890-915 MHz for upstream (mobile->tower) and 935-960 MHz for downstream (tower->mobile). The 868 MHz Xbee should operate in the 868-870 MHz range (otherwise they wouldn't sell it in Europe). So there's no overlap and there shoudn't be any interference from a healthy GSM cell tower.

    The range should be up to 40 km LOS (or 16 km if in Italy).

    (correct me if I'm wrong)

    Anyway, what environment did you do the testing in? Did you have a clear line of sight? What antennas were you using?
This reply was deleted.

Activity

DIY Robocars via Twitter
RT @_JonMyer: 🚨Attention DeepRacer's including #UndergroundDeepRacer🚨 Check our our LIVE stream that including @IAM_dbro Take a few moments…
14 hours ago
DIY Drones via Twitter
RT @MarvelmindMaxim: Extreme precision for 60 swarming robots. #marvelmind #autonomousrobotics #robotics #swarmrobotics #rtls #ips #indoor…
Monday
DIY Drones via Twitter
RT @MarvelmindMaxim: Precise (±2cm) tracking for racing boats and autonomous boats. Works outdoor and indoor. #autonomous #AutonomousVehic…
Monday
DIY Drones via Twitter
RT @MarvelmindMaxim: Helping PixHawk folks to fly autonomous quadcopters using PX4 and ArduPilot. https://marvelmind.com/drones/ Equally suitab…
Monday
DIY Robocars via Twitter
RT @chr1sa: The @DIYRobocars @donkey_car virtual AI car race is starting in 15 minutes! Watch it live on Twitch https://www.twitch.tv/mossmann3333 htt…
Saturday
DIY Robocars via Twitter
RT @chr1sa: Don't miss our monthly @DIYRobocars @donkey_car virtual AI car race tomorrow at 10:00am PT live on Twitch. Head-to-head racing…
Friday
DIY Robocars via Twitter
RT @sparkfun: Our completed tutorial on building an @NVIDIA Jetson Nano-powered @Sphero RVR gets your bot up and running via teleoperation…
Jul 30
DIY Robocars via Twitter
RT @SmallpixelCar: Freeway test https://t.co/4V5tV9lhIP
Jul 29
DIY Robocars via Twitter
Very small autonomous cars racing, thanks to an overhead camera: https://control.ee.ethz.ch/research/team-projects/autonomous-rc-car-racing.html
Jul 29
DIY Robocars via Twitter
Jul 29
DIY Robocars via Twitter
Jul 29
DIY Robocars via Twitter
RT @chr1sa: Don't miss our virtual AI car race this Saturday! Real developers + virtual cars =🏎️🏎️🏎️ Head-to-head battles with thrills, sp…
Jul 28
DIY Robocars via Twitter
Jul 27
DIY Robocars via Twitter
RT @usashirou1: Jetson nano by Isaac Kaya #jetson https://t.co/Mu1N0CyQkN
Jul 23
DIY Robocars via Twitter
RT @GPUsolution: JetRacer mady by Iflytek company #JetsonNANO #Nvidia https://t.co/MimTymIwge
Jul 23
DIY Robocars via Twitter
RT @openmvcam: I love this: Mega or Mini? Image Classification on the 1MB OpenMV Cam H7 by Ish Ot Jr. in OpenMV, Edge Impulse, Internet of…
Jul 23
More…