Warning! This modification voids the warranty and can operate the transceiver outside of it’s absolute maximum ratings! The PlutoSDR has an internal XO (Rakon RXO3225M 40.000 MHz), which has excellent qualities like very low jitter. Unfortunatly for ham radio use, the absolute accuracy (PPM) and stability isn’t great. When generating signals in the GHz-range (like a TX-signal for QO-100 at 2.4 GHz) the error can multiply up to several kHz, much more than the signal bandwidth itself.
