What is a 7/10" #14 Hairpin Inductor?

Discussion in 'Wireless & RF Design' started by doug08, Jun 5, 2011.

  1. doug08

    Thread Starter Member

    Jan 30, 2011
    153
    2
    Is it just a #14 copper wire that is U-Turn bent tight to a length of .70"?
     
  2. #12

    Expert

    Nov 30, 2010
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    Does this do you any good?
     
  3. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    What's your specific application? Is it a hairpin match - say for a Yagi antenna ....?
     
  4. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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  5. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Are you refering to the 6 watt broadband amplifier?

    [​IMG]

    Here I have taken some picturs of an other amplifier with different syles of hairpin coils.
    The following one shows the thick wire hairpin as in your wanted schematic:

    [​IMG]

    The other two pictures shows the hairpin made out of strip material:

    [​IMG]

    [​IMG]

    The pictures are taken here at home.

    Bertus
     
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  6. doug08

    Thread Starter Member

    Jan 30, 2011
    153
    2
    I made that circuit, it works, but not really good. I only had a 2-3 watt fm transmitter to try and amplify. When I connect the transmitter to the RF amp with the known good tuned antenna, it only draws between 0 - 150 ma. This seems like nothing for 6 watts. The output also is 1 mhz off from the transmitter output frequency. I have a small transmitter that is between 100 and 300 mw....it does no amplification at all on those. Does my circuit look ok?

    Thanks.

    [​IMG][​IMG][​IMG][​IMG]
     
  7. bertus

    Administrator

    Apr 5, 2008
    15,648
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    Hello,

    You have to long wires for a RF circuit.
    There is a PCB drawin on the site of the schematic (although the coil numbering is wrong over there).
    http://www.21say.com/2sc1971-6-watt-broadband-fm-amp/

    Also the input power is to less, it needs 0,5 watts input for the 6 watts output.
    If the input power is to less the output power will drop very fast.

    Bertus
     
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