vfone said:
Not only frequency instability (or PLL un-lock) affects the data transmission.
In data transmissions using modulations as QPSK, QAM, OFDM, etc, also the Phase Noise of the LO could affect the throughput of the data.
Thanks for your reply but I think modulation scheme should be a problema as I just replaced my synthesizer with signal generator . modulation scheme was same for both texperienments.
I am not sure about Phase noise that affects me because I already measure phase noise and itwas good though.