RedPitaya SDR project

I use RedPitaya as my base-radio for my 10GHz EME.

My setup is:

Redpitaya + g4ddk transverter 29/144 MHz / Kuhne MK2 transverter 2m/3cm

I had some issues on 10GHz with frequency stability so i have made a new LO for my G4DDK suffolk transverter using 1ppm oscilator. Another issue is the 125MHz oscillator on RedPitaya, at powerup it drifts at few Hz/minute. I plan to modify this and to use external reference-locked source, mod is describet here.

Guys from RedPitaya were so kind to give me the Audio codec. The schematics - how to connect codec can be found here.

WM8731 Red Pitaya
SCK --- DIO4_N (E1) Pin 12
MISO --- DIO5_N (E1) Pin 14
MOSI --- DIO6_N (E1) Pin 16
ADCL --- DIO7_N (E1) Pin 18
SDA --- (E2) Pin 10
SCL --- (E2) Pin 9
3,3V --- (E1) Pin 1 oder 2
GND --- (E1) Pin 25 oder 26

source:  and  (from the same source)


For the EME digital modes i use PowerSDR and WSJT-X. The commands between the two are sent via Virtual serial ports (VSPE emulator) software.

Audio is transfered over VB-Audio virtual cable.

In the future i plan to discard the 28/144 xverter and to try with oversampling and filters. In order to be able to do so, i need a version of RP without installed LowPass.