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Thread: I got an Antenna with a 75 Ohm Impedance. Did I screw up?

  1. #1
    FPV Crew Chief kalikraven's Avatar
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    I got an Antenna with a 75 Ohm Impedance. Did I screw up?

    How much difference will this make vs a 50 Ohm antenna? It's a wide band Yagi.

  2. #2
    Engineer for Jesus Christ IBCrazy's Avatar
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    75Ohms is not desirable, but should yield accceptable results so long as the elements are in the correct position. Most Yagis actually have a very low impedance (as in 30 ohms). I am surprised your is 75.

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

    videoaerialsystems.com - Performance video piloting

  3. #3
    FPV Crew Chief kalikraven's Avatar
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    It's a Wilson 304475 Wide Band Yagi. I was planning on trying it out for multiple video freq's. I may end up getting the 50 Ohm version and selling this one.

  4. #4
    Navigator Airborne's Avatar
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    This site offers a PCB log periodic antenna that has ~6dbi gain between 850MHz - 6.5GHz It is probably very similar to what is inside the Wilson antenna, but a lot cheaper ($18) and you can add your own connectors or run your own coax straight to the board.

    http://www.wa5vjb.com/products1.html

    Can't find any impedance ratings, however at this price you aren't going to be too upset if it sucks.

  5. #5
    Engineer for Jesus Christ IBCrazy's Avatar
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    I wouldn't bother changing it due to impedanece. You probably will not see a difference. Impedance only comes into play at the edge of your range. it is more of a measure to verify the antenna was built correctly in the first place.

    -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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