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SDR 6-in-1 Radio Clock
Martin Ossmann’s “SDR radio clocks” (Elektor January/February 2023, project 210335-03) makes a persuasive case: a Teensy 4.0 can sample a longwave carrier directly, mix it down with a software DDS and demodulate whatever is riding on it. One platform, five transmitters. But the author chose separate firmware per transmitter over one image with a selector, and the antenna is retuned by swapping a capacitor. This project ties both ends together.
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