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Re: SI labs generator chip which has an FM input pin

 

Yes, doing digital writes to update the si5351 for FM modulation was mentioned in that old thread:
? ??/g/BITX20/topic/6256856#34064
But updating fast enough to get good audio would be a fight.
? ??/g/BITX20/message/34362

Jerry, KE7ER


On Fri, Apr 9, 2021 at 08:55 PM, Ashhar Farhan wrote:
A neater way would be to read the modulating audio from an adc pin and program it to update the frequency of the si5351 very quickly. I believe usdx does that ti generate FM.
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