SSB

We are working on reversing the Huidu HD-R712 LED Display Full Color Receiving Card - a very cost-effective (~1000 INR) and widely available FPGA board. We draw inspiration from the https://github.com/q3k/chubby75 work. FPGA Blink Project Files 1 Random brain dump $ sudo openFPGALoader --cable dirtyJtag --freq 10000 --detect Jtag frequency : requested 10000Hz -> real 10000Hz index 0: idcode 0x4014c35 manufacturer anlogic family eagle d20 model EG4D20EG176 irlength 8 $ sudo openFPGALoader --cable dirtyJtag --detect Jtag frequency : requested 6000000Hz -> real 6000000Hz index 0: idcode 0x4014c35 manufacturer anlogic family eagle d20 model EG4D20EG176 irlength 8 JTAG pinout: V ┌───────────────────┐ │ 1 3 5 7 9 │ │ 2 4 6 8 10 │ └───────────────────┘ 9 => TCK 7 => TDO 5 => TMS 3 => NC (Not Connected) 1 => TDI The pin mapping work was done using a DMM, the datasheet, and an optical magnifier. ...

Polar Modulation for the masses We have been working on generating SSB signals using Polar Modulation. Hardware stack: RP2350-Zero MCU board + Fast Si5351 module + AP63301 buck regulator (for 5W mode). Please see https://github.com/kholia/PolarModulationSSB for more details. The audio fidelity and general quality is ok'ish at the moment but it can only improve from here. We are yet to hookup the amplitude ("envelope") restoration part. Motivation Why should Guido, Hans, and FlexRadio folks have all the fun? ;) ...