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Month: May 2018

teensy sdr transceiver – part 1

I’ve been following along with ZL2CTM’s latest Teensy SDR transceiver build and I’ve been trying to emulate his design even down to his construction style with the strip board. So far, I’ve got the radio receiving well enough. After troubleshooting a bad grinding and squealing noise for a week, I found a bad audio transformer. After replacing that, the rig came to life.

I was able to generate the quadrature oscillators with the SI5351 as detailed in this post and I’m amplifying the audio with the teensy itself, rather than an external audio amp. I’ll probably change that soon as it is still fairly low output and doesn’t sound that great. There is a video below demonstrating reception, but the audio is kind of low.

I’ve got some bad tuning clicks that I’ll need to resolve, but I’m happy with the progress so far. I would definitely recommend subscribing to Charlie’s Youtube channel. His videos are great and I have learned a lot from them.






Below is my code so far. I started with Charlie’s code and modified it to suit my needs.