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Thread: The crosshair 5.8!

  1. #1
    Shedding light over FPV HugeOne's Avatar
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    The crosshair 5.8!

    At last, the crosshair in 5.8Ghz will be available from TrueRC.

    It have the gain of a 5 turns helix yet the wide beam of a 3 turns with amazing axial ratio. Turn your goggle into a base station with the plastic support tube that can be shaped to accommodate various types of goggles by applying gentle heat. No adapters needed!


    -Each unit is tested on professional antennas tester (agilent) for SWR, gain and circularity.
    -Proudly designed and built in a basement of Canada.

    Gain: 10 dbic
    SWR: 1.3:1
    Axial ratio: 0.9 and up.
    Beamwidth: 120deg.
    Beamwidth @-3db: 68deg.





    Enough of infomercial stuff, let's see the measurements.
    Begin by SWR: (1.3:1 @5800Mhz wide bandwidth)




    Now let's point a RHCP helical and check effective transmitted power from 5 to 6Ghz:





    As you can see the transmitted power does not change that much across 5 to 6Ghz even if SWR change a lot, like our friend Sircana stated in his mythbuster thread.


    Now I hit the "normalize" key to bring everything to zero and make it our comparison point. (The response to a 7T RHCP helical placed 6" away is our reference)




    Replacing the helical by a LHCP one show the opposite polarization response of the antenna or axial ratio. At our frequency of interest (5.8) the LHCP response is 26dB below the RHCP, which yield an axial ratio of 0.94. The circularity happen over a wider frequency range than what we use in FPV for that band.




    -Hugo

  2. #2
    Navigator imagebuff's Avatar
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    Awesome Hugo. Count me in!

    Chris

  3. #3
    Kiwi in Germany whakahere's Avatar
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    Now that antenna is prefect bashing and prefect for quad guys. I bash trees in my planes about 700 meters away just on a spw and cl. When using my 5 turn helical it makes tree bashing even better. But this with a wide viewing range and strength of signal. Prefect! so overall it will give about 5-6km of range and most likely 3km - 4km of clear range if it is anything like a 5 turn helical.

    This is a what the 5.8ghz community needs as high gain on 5.8ghz used to mean a need for a tracker. now I wish I had money to buy one lol
    Whaka's Tinkerings blog --> http://fpvlab.com/forums/showthread.php?36623-Whaka-s-Tinkering&p=631753#post631753
    Battle H Virus (home build basher quad tutorial) --> ]http://fpvlab.com/forums/showthread.php?12544-Tutorial-Battle-H-Virus
    Range record on 5.8ghz 200mw 24km --> http://www.rcgroups.com/forums/showthread.php?t=1441664

    The one thing I know how to do well with FPV - crash. All in a day of fun!
    I believe landing is a full body experience .... I do my best to aim for your body.

  4. #4
    Navigator gabe's Avatar
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    Looks great!
    Please let us know when available in stock.

  5. #5
    Banana Drone Flying Monkey's Avatar
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    Neat! I'm on 5.8 now so count me in!
    "You can't take the sky from me"

  6. #6
    Engineer for Jesus Christ IBCrazy's Avatar
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    I bow down to the master. This is absolutely incredible, Hugo! I have an idea on a CNC machine to make the wires for this if you want to mass produce it... although when people learn how great this performs, you will be doing nothing but building these for the next 9 months...

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

    videoaerialsystems.com - Performance video piloting

  7. #7
    Canadian FPV Tracks's Avatar
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    This is great, Hugo, but didn't you already have these? I'm sure I saw pictures before.

  8. #8
    Shedding light over FPV HugeOne's Avatar
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    Thx Alex! Yeah I think I have a lot of work in front of me.

    Tracks, you saw them in my hands at the Montreal meet

    -Hugo

  9. #9
    I see you... Derrick's Avatar
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    If the price is right... count me in too!

    speaking of price... Do you have one in mind?

  10. #10
    Engineer for Jesus Christ IBCrazy's Avatar
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    $75? Seriously? For this kind of performance? That's cheap! I don't think I'm even going to think about attempting this one.

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

    videoaerialsystems.com - Performance video piloting

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