Configure the External 32.768 kHz Crystal as an RTC Clock Source in Sleep Mode Using AVR128DB48
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Digital controlled radio frequency oscillator based on Raspberry Pi Pico (1 Hz to ~32.333 MHz band). RTTY, MFSK, freq sweep examples are included.
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WSPR beacon for Raspberry Pi Pico, based on pico-hf-oscillator library. It doesn't require any hardware - Pico board itself only.
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rpitx is a general radio frequency transmitter for Raspberry Pi which doesn't require any other hardware unless filter to avoid intererence. It can handle frequencies from 5 KHz up to 1500 MHz.
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uSDX smd: An effecient and lightweight HF radio
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