I poked around a bit today and remembered what the problem is with fcd: the sample rates are too low and fixed at a rate that is not compatible with our gnuradio scripts (in the way they are written today). The original funcube dongle is 96kHz and the pro+ is 192kHz… Our first decimation calculation divides the incoming sample_rate by 250k.
So… the funcube dongle is feasible but only after refactoring all of our gnuradio scripts and filters, which I can’t quite estimate when such a task would be done (or by whom).
Could you get an rtlsdr dongle? Something like the v3 from https://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/