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Stryker sr 497hpc pot numbers for hi and low power

Discussion in 'Amateur Radio Modifications' started by Smoker, Sep 20, 2015.

  1. Smoker

    Smoker
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    Can anyone tell me which trimmer pots are for modulation and low and hi power please I can't find schematic on this anywhere for the 497 with the 4 mosfets


     

  2. BBB

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    Can you take a photo of the main board and post it up?
     
  3. Smoker

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    image.jpg
     
  4. Smoker

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    I've read some things that lead me to believe that vr14 is modulation vr13 is high power and vr21 is low power but someone also said that vr16 is low power on this board and I just want to be sure before I touch anything
     
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  5. BBB

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    It appears Stryker kept the discrete component style of construction and your main board seems to be similar to the 440 (like all of the big Stryker radios.) That being said and according to the following information VR14 is the modulation pot, VR21 is the AM low power and VR13 is the high power adjustment. Interestingly, I don't see VR 21 on the PC board layout PDF so you could be right about VR16 being low power. Hmmm. Just take a fine point sharpie marker or similar and mark the pot and board with a hash mark before you adjust them in case you wanted to go back to the original settings.

    http://www.cbtricks.com/radios/stryker/sr_440hp/graphics/sr_440_hp_alignment.pdf

    Another site references the lack of a low power adjustment and required some additional components to bring down the carrier. Obviously a few variants of this board are out there.

    http://www.radiomods.co.nz/forum/viewtopic.php?t=1925

    The Stryker 497HPC is one of my all time favorite solid state AM radios by the way. Got a couple in my vehicles ;)
     
    #5 BBB, Sep 21, 2015
    Last edited: Sep 21, 2015
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  6. Smoker

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    Thanks so much the vr21 is toward the front of the radio and thanks for the info about the sharpie that will help me out
     
: stryker, mods

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