Hybrid Single Sideband QRP Transceiver
This is the firmware and design files for a multiband hybrid single sideband (SSB) transceiver for the traditional amateur bands. Bands covered are 80M, 40M, 20M, 15M, and 10M.
73, VK7IAN
Built using the Pi Pico arduino environment by Earle F. Philhower, III. See install details at:
https://github.com/earlephilhower/arduino-pico
Here is the "Additional Boards Manager URL" for quick start:
The following libraries are needed to work with the MS5351M and SPI colour LCD:
- https://github.com/etherkit/Si5351Arduino
- https://github.com/Bodmer/TFT_eSPI
- https://github.com/brianlow/Rotary
The HySSB is a single conversion superhet with an IF of ~11.06MHz. There are 3 bandpass filters at 3KHz, 2.4KHz and 400Hz. The spectrum display is implemented using a quadrature sampling detector (QSD) after the first mixer and before the crystal filter. A 6db resistive splitter routes the signal to the crystal filter and the QSD. The QSD operates at 4 times the BFO frequency. The I and Q outputs of the QSD are sampled by the ADC in the Pi Pico microcontroller at 250Khz (interleaved). The uC performs a 1024 point complex FFT from which the magnitude of the signal is used to generate the sprectrum and waterfall display.
