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Thread: Taranis Antenna Mod - thinking about folded dipole?

  1. #1
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    Lightbulb Taranis Antenna Mod - thinking about folded dipole?

    Hello everyone,

    After upgrading my Taranis with antenna mode (84 mm, RG316, good soldering) I got even less range (at about 200 m away my Taranis is screaming RSSI low).
    Bought 2 same 6 db antennas (recommended by Joshua in his video) They are totally different. One shows RAS (SWR) between 0 and 1 with range about 200 m the other one RAS (SWR) 12 with even less range. Tried 8 db TPLINK antenna. Little bit better results but not significantly.
    So I guess we need to tune antenna.
    This is where I started researching different antenna options and realized that people like you probably already use folded dipole. I don't want just buy another antenna blindly and realize that it is also not working. I am hoping to get some calculation done and maybe understand how I can tune it at home and what range should I expect. I fly racing drone but still want to go further than 200 m.

    So I would like to keep my Taranis mod as it is and try folded dipole with RG-402 coax cable (I use it for pagoda 5.8 GHZ)
    I guess I need to know what frequency is in the middle of Taranis radio range (is it 2430 MHz?).
    I am hoping to use calculator http://www.vk5dj.com/yagi.html but missing information on how to make a baloon with RG-402. Or maybe I have to use different coax cable for baloon.
    Can anyone point me in the right direction? This antenna science is not easy. Maybe other good antenna options for modded Taranis.
    Thank you in advance.

  2. #2
    Engineer for Jesus Christ IBCrazy's Avatar
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    You need to watch this video I made: https://youtu.be/bnK3HGzdmTc

    That should explain why certain antennas work well and others do not. The code to simulate your own is in the video description and the software is free.

    The balun I use is RG316 as well. The shielded part of the balun needs to be 42.5mm long.

    You can just buy my antenna for it for $25 here: http://www.stoneblueairlines.com/vas...le-2-4ghz.html

    However, if you prefer DIY, I am happy to help you here.

    -Alex
    If it is broken, fix it. if it isn't broken, I'll soon fix that.

    videoaerialsystems.com - Performance video piloting

  3. #3
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    Alex,
    Thank you for all information. I will try make own antenna.
    Do you know what range should we expect from Taranis with folded dipole (assuming open field)?
    I have seen interesting receiver https://www.helidirect.com/radios/receivers/spd15.html
    Is it reasonable to expect at least 500 - 700 m of range?
    Thanks,
    Nick

  4. #4
    Engineer for Jesus Christ IBCrazy's Avatar
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    1000 meters should be easy with this mod. Take some close-up photos of your antenna (especially the feed point) before you start using it and I will verify everything is correct. If you need any help, just post here.

    -Alex
    If it is broken, fix it. if it isn't broken, I'll soon fix that.

    videoaerialsystems.com - Performance video piloting

  5. #5
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    Wow... I'm easily able to get almost 2Km consistently from my FrSky gear with the stock antenna. What are you guys doing? :-)

  6. #6
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    xjet, looks like you are one of those lucky people. I don't think my Taranis was ever capable of this.
    Here is the story.
    Stock antenna on Taranis is basic dipole made with very thin cable so it was logical for someone to think that replacing this antenna with something better quality would allow better range.
    When dealing with coax cables it always less signal losses in thicker cable. So people proposed to replace stock antenna with RG316 cable h rp-sma connector. This allows you to try different antennas. For some people this worked and did not work for others. FrSky even released special edition version of their Taranis x9 plus. I noticed online that some people having the same issue this Taranis special edition.
    I used 2 different calculators
    http://www.changpuak.ch/electronics/Dipole_folded.php
    http://www.vk5dj.com/yagi.html
    to calculate folded dipole (still owe pictures for Alex) hoping that it will improve my range and even purchased antenna http://www.stoneblueairlines.com/vas...le-2-4ghz.html recommended by Alex and did not achieve acceptable results.
    Currently waiting for replacement stock antenna to see if it makes any difference. I am missing something and cannot understand what it is.

  7. #7
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    I suspect that a great deal of the difference experienced is down to the noise floor. We've got a low (but not super-low) noise floor here on 2.4GHz and it doesn't take much extra noise to significantly affect the range of a 2.4GHz system. I'm also a bit OCD when it comes to my installations which helps too.

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