Discussions

915mhz Telemetry

Posted by Finnius on February 18, 2014 at 5:24pm

Hey folks,

Did the original 900mhz telemtetry kits that have the built in usb adapter on the ground radio get the interference or was it just the 433mhz ones that had limited range because of usb interference?

Also, do you think i can get away with 1.2ghz video (1.2ghz inverted vee) and 915mhz telemetry (1.2ghz cloverleaf) on my drone - or will there be interference? Should i stick with the 915mhz antenna for the telemetry instead of a 1.2 cloverleaf i have available, to reduce the amount of 900mhz telemetry getting into the 1.2ghz?

Any help would be appreciated.

Thanks

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  • This reply was deleted.
    • Finnius February 19, 2014 at 3:23pm

      Thanks for the info.

      I will try out my video on 1.2 and my telemetry with 900. Each with their own appropriate antennas. Do you think i will get interference from 1.2 on 900? Also, i have been googling everywhere but can never seem to find out whether cloverleafs or inverted vees have better range for long distance flying? As i am hoping to put an inverted vee from the 1.2 on one wing and an inverted vee on the other for the 900 mhz telemetry radio... then i would have a biquad of each 1.2 and a 900 on the ground to recevie both - sounds good to me??

      Thanks for the reply

      • This reply was deleted.
        • Finnius February 19, 2014 at 4:05pm

          Do you mean i have to have my biquad sideways if my inverted vee is sideways for correct polarisation? How so? Also, what type of range do you think i could get with a inverted vee and biquad on those 100mW radios at 900mhz? Thanks so much

          • This reply was deleted.
            • Finnius February 19, 2014 at 5:15pm

              oh wow!

              thanks for the sketch.

              so i should have my biquad with the elements at right angles to the earth if the inverted vee is parallel to the earth. do you know why this is so? it just looks right when both antennas are parallel to the earth...

              also, several miles LOS with 100mw at 900mhz with an inverted vee - wow! i cant wait to take it for a flight, but i will be testing with the little rubber duckies first.

              i read you have a flying wing? if so, are you running it with an apm, and how much weight do you carry. i have a bixler frame with a lot of mods, because it can carry all my gear, fpv as well as uav.

              Thanks Geoffrey

              • Finnius > Finnius February 19, 2014 at 5:21pm

                also you mentioned cloverleaf not generally being any better than a dipole, is an inverted vee better than the standard diy dipole?

  • Finnius February 18, 2014 at 5:54pm
    I also have a 1.2ghz biquad, do you think i could receive both my 915mhz telemetry and 1.2ghz video through the same antenna?
  • Finnius February 18, 2014 at 5:37pm

    Also, i have notice that the 3DR 433mhz telemetry units have a usb plug that goes straight into them. Wouldn't that mean that the ground one would still be using an inbuilt usb adapter - that causes interference. I thought that they replaced those versions with one where the adapter was out of the module, i just cant see it in the description or images.

    Thanks

This reply was deleted.

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