Using the Si5351 with Arduino for some simple FM modulation

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Undoubtedly, very messy spectrum (needs filtering), and I need to better understand the circuit involved... but it seems to work. AD9850 is better documented and cleaner, I think. But perhaps the core of a foxhunting transmitter in there somewhere.
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You dont explain how this is hooked up to actually modulate

researchandbuild
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What a good idea! I also like the vids on the Simpleceiver. Have you posted the schematic and code for FM on the Si5351? I am stuck on programming the deviation. 73s and DXs!

danielrperez
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Well, the 9850 was better documented and fairly popular at one time, but things have changed. Si5351 is very popular now. ND6T has is easygen2, looks very similar to what you are doing except for the modulation. How did you modulate it ?

californiakayaker
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Where is the diagram to show how you did this

JustnTheNick
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Is this using the vcxo pin on the si5351 to directly modulate it?

Eltimple
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how can I get a square wave signal with this module, on the order of 10 MHz but with amplitude from 0V to 3V ??(em MHZ)?

rafaelbarbosacosta
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