Telemetry in Australia

Posted by Glen Leeon on May 19, 2014 at 10:08pm

I have an Iris from 3DR and would like to connect a OSD and fly some auto missions.

What is the correct telemetry frequency we are allowed to use in Australia?

915mhz or 433mhz.

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Replies

    • mP1 > Glen Leeon May 19, 2014 at 11:33pm

      The lower the frequency the greater the range and ability to penetrate objects. Notice that your wifi which is 5.8 doesnt go very far, while a mobile around 900mhz which probably transmits at a similar mw has a lot more range.

      Lower ranges also require larger antennas because the waves are bigger. As with all things theres a tradeoff.

    • Glen Leeon > mP1 May 19, 2014 at 11:42pm

      So what kind of range would I expect from this unit? It seems to be only a little dinky thing. Antenna is only 100mm. Don't know if that big or small for this type of thing. I know my antenna in my phone isn't visible any longer. So line of sight range? Again I don't know if 50m is good, or 500m is average?

  • Adam Warburton May 19, 2014 at 10:48pm
    Well technically both, however without any sort of license at 433mhz the telemetry modules must be set back to 25mW whereas 915mhz can be be used legally at the full power (100mW).
    I use 915mhz and never had any issues, investing in some higher gain antennas will help you get some decent ranges with that.
    • Matthew Kerle > Adam Warburton May 19, 2014 at 10:57pm
      Really? I was under the impression that the telcos owned the frequency around 900mhz for 3g etc? I could be wrong...
    • Adam Warburton > Matthew Kerle May 19, 2014 at 11:02pm
      915mhz is ok to use up to 1W so long as the transmitters are frequency hopping with a minimum of 50 channels (which the 3DR radios are). It's a different story with single channel transmitters like FPV video transmitters, I can't remember exactly but you either cannot use it at all or only at very low powers.

      433mhz has no provision for frequency hopping so it's 25mW no matter how you broadcast without a license.
    • Matthew Kerle > Adam Warburton May 19, 2014 at 11:13pm
      You're right, I do recall reading that somewhere. Thanks!
  • Matthew Kerle May 19, 2014 at 10:14pm
    Depends, do you have an amateur radio licence? If not then technically neither. If you do then I think you can use 433mhz, but you might need the intermediate or advanced licence. Someone more knowledgeable than I could probably say for sure...
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