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Re: zBitx +-2 MHz transmit spurs?


 

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Cannot guarantee it, but might be worth a try. Gotta fix those little problems. All radios have issues.

On Apr 14, 2025, at 17:40, Ron, N6YWU via groups.io <ron.nicholson@...> wrote:

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If zbitx/si5351v2.c is the correct place to look, then in lines 243, I see the variable drive_current being set to 2ma. But then that variable is being ignored, and the Si5351 is being configured in line 249 :
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set_freq_fixeddiv(clk, pll, frequency, pll_div,?
? ? ? ? ? ? ? ? ? ? SI5351_CLK_DRIVE_STRENGTH_8MA);
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Changing this to 2 mA might help reduce the spurs according to KX4Z (Thanks!).
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- Ron
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