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FET conversion project

Discussion in 'CB Radio Forum' started by rabbiporkchop, Apr 20, 2017.

Page 2 of 4
  1. Apr 25, 2017 #11
    Ridgeline

    Ridgeline Road Train Member

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    You got an analog meter right with a DB scale on it?

    you don't need to be accurate just see the differences.

    You don't need to know what the output level is to come up with a simple t pad or l pad to attenuate the audio.
     
    Ridgeline, Apr 25, 2017
    Ridgeline, Apr 25, 2017
    #11
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  3. Apr 25, 2017 #12
    Ougigoug

    Ougigoug Heavy Load Member

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    I personally prefer the SL41 and your mic compare to the 198, but then again someone with a different voice tone and that could change everything.

    Also prefer without echo, but to each his own....
     
    Ougigoug, Apr 25, 2017
    Ougigoug, Apr 25, 2017
    #12
    rabbiporkchop Thanks this.
  4. Apr 25, 2017 #13
    CW Spook

    CW Spook Light Load Member

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    Interesting. For some reason, the echo was only noticeable on your mic, Rabbi. They're all pretty close, but I'm partial to the sound of the SL41, but maybe that's because that's what I have...lol.
     
    CW Spook, Apr 25, 2017
    CW Spook, Apr 25, 2017
    #13
    rabbiporkchop Thanks this.
  5. Apr 25, 2017 #14
    Dirtymartini15x

    Dirtymartini15x Light Load Member

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    This is a tough one. They all sound similar with the edge in clearity barely going to the SL41 but i think with better noise canceling the custom mic would be very close to the other two.
     
    Dirtymartini15x, Apr 25, 2017
    Dirtymartini15x, Apr 25, 2017
    #14
    Ougigoug and rabbiporkchop Thank this.
  7. Apr 25, 2017 #15
    rabbiporkchop

    rabbiporkchop Road Train Member

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    I do not have an analog meter anymore, unfortunately.
    This might be useful at higher voltages.
    Attenuator is unnecessary @ 1.5v though.
    [​IMG]
     
    Last edited: Apr 25, 2017
    rabbiporkchop, Apr 25, 2017
    rabbiporkchop, Apr 25, 2017
    #15
  8. Apr 25, 2017 #16
    rabbiporkchop

    rabbiporkchop Road Train Member

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    I do believe it's going to be hard to beat the performance of the Palomar Sl41 in a noisy tractor trailer. My next one I'm going to build with a switchable high pass filter and it's going to be for use in a four wheeler that's nice and quiet inside so I'll have the option of switching between studio quality audio and narrower banded audio for more efficient performance. Without some extensive cutting and grinding on the case I don't think I'm going to get the noise cancelling perfected until I get my hands on one of these.....
    [​IMG]
     
    rabbiporkchop, Apr 25, 2017
    rabbiporkchop, Apr 25, 2017
    #16
    Dirtymartini15x Thanks this.
  9. Apr 26, 2017 #17
    rabbiporkchop

    rabbiporkchop Road Train Member

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    I came up with an innovative solution to reposition the element to fix the noise cancelling capability.
    $0.75 @ Lowes and a little belt sanding made the perfect element holder.
    2017-04-26 12.38.57.jpg
     
    rabbiporkchop, Apr 26, 2017
    rabbiporkchop, Apr 26, 2017
    #17
    Ougigoug, Dirtymartini15x and Neverready Thank this.
  10. Apr 27, 2017 #18
    rabbiporkchop

    rabbiporkchop Road Train Member

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    looks like I'm all set for putting my next one together and this time the noise cancellation should be pretty good.
    [​IMG]
    [​IMG]
     
    rabbiporkchop, Apr 27, 2017
    rabbiporkchop, Apr 27, 2017
    #18
    Dirtymartini15x Thanks this.
  11. Apr 28, 2017 #19
    rabbiporkchop

    rabbiporkchop Road Train Member

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    As soon as the epoxy hardens, I can peel out the retaining wall and start connecting wires.
    [​IMG]
     
    rabbiporkchop, Apr 28, 2017
    rabbiporkchop, Apr 28, 2017
    #19
  12. Apr 28, 2017 #20
    rabbiporkchop

    rabbiporkchop Road Train Member

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    I just got it finished with the switchable high pass filter...
     
    rabbiporkchop, Apr 28, 2017
    rabbiporkchop, Apr 28, 2017
    #20
    Ougigoug and Dirtymartini15x Thank this.
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