The Simplest FT8 Transceiver You’ll Ever Build - It may only be 100mW Output But FT8 Is Designed Specifically For Weak Signal Modes
Its brains are a Teensy 3.6, while the receiver side is a Si4735 receiver chip and the transmitter is a Si5351 programmable clock chip driving a Mini-Circuits GVA84 power amplifier with an appropriate filter. The interface is via a touchscreen display. It relies on existing work that applies a patch on-the-fly to the Si4735 receiver chip for SSB reception, and another project for the FT8 software.
The charm of this transceiver is that it can be assembled almost in its entirety from modules. If the 100 mW output power seems a bit low, it’s worth remembering that FT8 is a weak signal mode, and given the right propagation conditions the world should be able to hear it despite the meagre output.
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