Here’s the SV1EIA usb2sdr board controlling the Si570 chip on the vfo kit from K5JHF/K5BCQ, the MCU and display unit are of course removed. And the Si570 board is clocking the LA6NCA QSD unit. I haven’t calibrated anything yet, but it works fine.

Simple usb2sdr receiver setup. Top: K5JHF/K5BCQ Si570 board. Left: LA6NCA QSD board. Right: SV1EIA USB2SDR board.

Receiving wspr with the simple sdr setup.