A compact hardware device for transmitting WSPR messages based on the SI5351 clock generator, using GPS for transmission timing synchronization and automatic QTH locator calculation.
Custom firmware for Vaisala RS41 and Graw DFM-17 radiosondes with support for amateur radio use. Ideal for tracking high-altitude balloons. Supported modes include APRS, Horus 4FSK mode, CATS, morse code (CW) and additional digital modes like WSPR and FT8 via Si5351.
Portable QRP CW Transceiver
All HF bands QRP CW/SSB transceiver
Open‑source Si5351 frequency generator powered by ATtiny1614, supporting 3 outputs, calibration, EEPROM, and intuitive menu navigation.
Digital Variable Frequency Oscillator to be applied to Citzen Band/Amateur Radio transceivers.
Arduino Si5351 VFO Code with 10 MHz Calibration and Iambic Keyer for Tuna Tin S QRP CW Transmitter
SI5351 Signal Generator
STM32 stuff
Amateur Radio Single Sideband Transceiver Controller for Arduino and SI5351 Clock generator. Includes Dual VFO, single or double band support for 20 and 40 meter bands, CAT control, optional S-meter, multiple supported displays including options include 20x4 LCD, Color TFT, and 2.8" Nextion Touch Screen
Sets Si5351 CLK0 frequency from 100 MHz to 150 MHz using just 1446 bytes of program storage space on an ATTiny85. I made an effort to provide explicit references to the Si5351 Data Sheet and Application Note AN619 for all significant programming decisions and calculations.
A WSPR beacon that uses novel techniques to control an Si5351 for mHz frequency control even into the UHF range.
Simple SI5351 based SWR resistive bridge antenna analyzer
Library for the Si5351 clock generator IC in the Arduino environment
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