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Thread: Crosshair - 10 dbic Circularly polarized antenna tutorial!

  1. #1481
    Is this a suitable method for the balun contruction. Two 3mm nuts soldered to 3mm washers and then soldered to the tube, which will hold the coax firmly and centrally. No problems with the function of the antenna/balun?

    Tom.


  2. #1482
    Should the nuts and washers be turned outwards and mounted at the very extremities of the tube to give the correct, calculated volume of air? Is it that critical?

    Tom.

  3. #1483
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    Hi Alex, thanks so much for posting the info for this build. I have just completed my first homebuilt antenna, tested it to 6km and it shows no signs of breaking up. Absolutely fantastic, super stoked. Cant thank you enough.
    Last edited by Racingmule; 20th December 2016 at 02:51 AM.

  4. #1484
    Hi Guys,

    Wow! This is great!!! Thanks for the post Alex... I might have some questions at some point but as soon as I have all the parts, I will make this and post up my results....

  5. #1485
    Ok,
    Question number 1... and it's probably been covered but I've not seen it....
    Does the thickness of the reflector plate matter?
    Also, Let's assume you want to plant yourself on top of a hill and fly all round, I am guessing you would want to fit this to a tracker???

    I'm still waiting for parts to come but looking forward to this...!

  6. #1486
    More questions, seeing as I'm still waiting for parts...

    Forget the tracker question, I picked up a bargain MFD AAT V5!

    So,
    If I was to build this at the small size for 1280, What could I expect out of it?
    I'm running a Partom 800mw VTX with a Cloverleaf...

  7. #1487
    Engineer for Jesus Christ IBCrazy's Avatar
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    Quote Originally Posted by KillerDave View Post
    More questions, seeing as I'm still waiting for parts...

    Forget the tracker question, I picked up a bargain MFD AAT V5!

    So,
    If I was to build this at the small size for 1280, What could I expect out of it?
    I'm running a Partom 800mw VTX with a Cloverleaf...
    More range than your radio can do. You are talking about a 25 mile link.

    As for thickness - it really doesn't matter. So long as it isn't foil thin, you're ok.

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

    videoaerialsystems.com - Performance video piloting

  8. #1488
    Quote Originally Posted by IBCrazy View Post
    More range than your radio can do. You are talking about a 25 mile link.

    As for thickness - it really doesn't matter. So long as it isn't foil thin, you're ok.

    -Alex
    Wow! Thanks Alex...

    I have ordered all I need and the reflector is galvanized steel .9mm thick.
    Really looking forward to it...

    25miles is way past what I'll ever need... :-)

    Thank you....

  9. #1489
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    Hi! I recently bought 2.4 crosshair and pepperbox VAS antennas.

    The coax cable that comes out of the balun looks weird on the Crosshair antenna... The outer shield of cable is completely covered with solder -- approx 2 inches / 5cm of length -- all the way inside the wooden box. Is it normal? What's the purpose of it? The pepperbox has normal clean cables, but the crosshair I received has this stuff.

    The SWR of my crosshair antenna, according to the label on the cardboard box, is 1.5 -- which seems to be the highest acceptable for crosshair antennas VAS sells. Thank you.

  10. #1490
    This antenna really kicks ass for long range and it is handy. I spent some time to make a 5GHz. It takes time but it is worthy. Highly recommended.

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