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Tkm radio demod ??

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dsc45shooter

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Can someone explain to me what the demod level adjustment screw actually does? I have a tkm mx12. I know i can push the VT button and use the VO screw to center the needle but what does the demod level adjust? How do you know if it needs either turned up to backed off? I think it adjusts the vrms to cdi but not clear on that.
 

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