RP2350-SDR-CW-Interface

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pa3gsb

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Aug 10, 2026, 8:15:57 AMAug 10
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Hi All,


Maybe CW fans like this.




Enjoy

73 Johan
PA3GSB
RP2350 SDR CW Interface - version 1.1.pdf

KK7OEA

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Sep 12, 2026, 9:24:58 PMSep 12
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I’ve been waiting for a device like this for a long time. I tested it, and it works perfectly with Hermes Lite-2, Thetis on Windows. I am especially grateful for the feature of single paddle CW key. The device also allows for use with WSJT-X and SSB. If you use WSJT-X, don't forget to turn off the WM8960 microphone boost in Windows; otherwise, the microphone will add room noise to your transmission. I'm sure it's possible to set it up via software so the microphone turns off when using WSJTX, but I'm not a programmer—it's easier for me to do it with a soldering iron. 

Rick Koch

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Sep 15, 2026, 4:09:34 PMSep 15
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Tnx Johan for this project. I had a WaveShare RP2040 and wm8960 board on hand so I set
out to port it and get it working on that. So far it initializes and I get audio devices and tones
generated when using paddles.

If anyone has an RP2040 and wants to give it a try check out my repo:
there's a uf2 in the release DIR

Let me know what doesn't work...

-Rick / N1GP
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