I boosted the Range of my Transmitter, but not sure why.

Discussion in 'Wireless & RF Design' started by 64C113M Abe., Oct 3, 2016.

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  1. 64C113M Abe.

    Thread Starter New Member

    Sep 13, 2016
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    I made a shortwave transmitter, but today I modified it.

    The frequency is 7.328Mhz.

    The drawing attached is of the final output stage to the antenna.

    Circuit #1 is what I had and was able to reach approx. 100 feet.

    Circuit #2 is what I now operate at and now reach 1500feet.

    What I'm not sure about is what caused this increase in range?

    Was it the increase in current or the RFC ?
     
    Last edited: Oct 3, 2016
  2. SLK001

    Well-Known Member

    Nov 29, 2011
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    For one, you are no longer dissipating power in your collector resistor. That power can now be used by the transistor.
     
  3. Papabravo

    Expert

    Feb 24, 2006
    10,144
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    You do realize that you are operating an illegal transmitter in the 41 M international broadcast band -- right?
     
  4. 64C113M Abe.

    Thread Starter New Member

    Sep 13, 2016
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    Yeah I think about that all the time, I'm out of the band plan I know, I wanted to work the 40 meter band. Yes I'm licensed in that band
    But going back to the shortwave transmitter I wonder, who's even listening? I would be so pleased if they actually found me.

    So far no complaints
     
  5. DickCappels

    Moderator

    Aug 21, 2008
    2,654
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    The TS said this is in violation of some law, and that means that this thread is not allowed.
     
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