Antenna for T3 transmitter?

Discussion in 'Rocketry Electronics and Software' started by Nathan, Sep 12, 2019 at 8:48 PM.

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  1. Sep 12, 2019 at 8:48 PM #1

    Nathan

    Nathan

    Nathan

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    The Missileworks T3 has an option to get the transmitter with either a wire whip antenna or an RP-SMA connector to attach an antenna. They show a picture of it with a stubby antenna attached but they don't sell the antenna. Where can I get an antenna like this that will work with the T3 transmitter? I need a short one like this for it to fit in my smallest rocket.
    [​IMG]
     
  2. Sep 12, 2019 at 10:07 PM #2

    mikec

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  3. Sep 12, 2019 at 10:17 PM #3

    cerving

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    I would recommend against purchasing any antenna that doesn't have full technical specs, they rarely live up to what they say on the web site. Since the T3 uses the same band as Eggfinders, I recommend the Linx ANT-916-CW-QW, it's designed specifically for the 902-928 MHz band. They'e about $7 plus shipping from Mouser or DigiKey. The antenna in that picture looks similar to a Pulse-Larsen W1911, which "will" work in that band but it's really designed for cell phones on 850/1900 MHz... the gain in the 915 MHz band is barely above zero, and the SWR isn't good.
     
    Last edited: Sep 12, 2019 at 10:29 PM
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  4. Sep 12, 2019 at 10:29 PM #4

    swatkat

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    THIS^... I only have the 1/4 wave on mine. I've not seen one shorter... 20180730_151308_resized.jpg
     
  5. Sep 12, 2019 at 10:37 PM #5

    Nathan

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    Okay thanks, that's what I will get.
     
  6. Sep 12, 2019 at 11:19 PM #6

    Cameron Anderson

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    Is there better range with the stubby antenna on the T3? More power consumption?
     
  7. Sep 12, 2019 at 11:24 PM #7

    mikec

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    Thanks to Cris for his response. BTW, I always just use the wire antenna on my 900 MHz transmitters. There's not much additional benefit from the other antennas and they're harder to fit and can load the connector in a crash and break it.
     
  8. Sep 12, 2019 at 11:53 PM #8

    RocketDestroyer

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    Probably less range with the stubby antenna as compared to the wire antenna. The power consumption should be the same with either antenna. I agree with mikec the antenna with the connectors will be harder to fit in and more likely to break.

    Here is a youtube video comparison of various antennas for the 2M Ham bands. The stubby antennas didn't do so well.

     
    Last edited: Sep 13, 2019 at 2:28 AM
  9. Sep 13, 2019 at 3:36 AM #9

    cerving

    cerving

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    The stubby antenna that we ship with the Eggfinder Mini is a Linx ANT-916-PW-LP, it's a helically-wound 1/4 wave antenna rated at 2.4 dB and a maximum SWR of 1.9 within its range (902-928 MHz). That's a pretty good upgrade from a wire antenna (which you assume is near 0 dB)... unfortunately they only offer it in a screw mount, so it basically has to be built into the tracker. If Linx starts shipping it in a RP-SMA version, we'll start selling it in a heartbeat.
     
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