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Thread: DIY 5.8GHz Helix

  1. #21
    Navigator Kondor-FPV's Avatar
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    That's another meaning of a directional antenna... kinda telling the signal to go the one way it doesn't hurt.

    Here are some matching LHCP antennas
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  2. #22
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    Hi Everyone,
    This is my first post, so please be gentle.

    Would a 50mm bit of round brass be ok for a reflector?



    Looking to try building a 3 or 4 turn version for an airwave 5.8g setup.

    Thanks!

    John

  3. #23
    Michael Mictronics's Avatar
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    Sure, that's fine.

  4. #24
    Navigator Kondor-FPV's Avatar
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    Here's the latest design:
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  5. #25
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    Hi Guys,
    Thanks for the great thread and info.
    I am experimenting with a helicone consisting of a 9turn helix as above with a conical reflector made from a polystyrene cup coated in aluminium foil placed inside another cup for more strength.
    It is for use as a seeker on a pan tilt camera mount to steer a 5.6ghz dish.
    My reason for posting is a tip about the wire being too soft to hold its shape. Its an old one from the days of wiring circuits in single insulated wire.
    Fasten one end, hold the other in pliers mole grip etc then stretch it suddenly. you will feel it stretch easily then harden and possibly break near the end.
    The copper has work hardened, it will be absolutely straight and will hold its shape when formed.
    Another tip, clear polystyrene makes a great support for 5.8ghz antennas

  6. #26
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    I noticed that there is a feedpoint of 2.5mm can this just be a bent part of the coil it self?

  7. #27
    Pilot Byro's Avatar
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    Do you mean the vertical center pin that connects to the helical wire? If so I don't see why not.

  8. #28
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    "Coil spacing 11.8mm" is this measured from wire center?

  9. #29
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    Im about to build one for 5.8 following these exact steps, because i dont have measuring tools. I just have RG 316 cable and asking me if i have to encapsulate this with an extra copper tube as it seems in this tutorial, does this avoid the signal escaping from the cable when feeding through the reflector ? I think ibcrazy was searching the same effect routing his helicals feeding the cable from the side, parallel to the reflector. So any of these solutions are ok for 5.8 ?
    Ive read lots but RF still doesnt want to be my friend...

  10. #30
    Engineer for Jesus Christ IBCrazy's Avatar
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    I'm having a hard time understanding what you are asking, Ayrton. You simply solder the cable shield to the reflector and the center conductor to your coil. To tune it, you need specialized equipment. However, for a DIY unit, you really do not need it.

    -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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