Hi Jim, Is BPSK the modulation used on such an 8bps link for DSN? If so, any idea what limit of C/N is used? And in what BW? My interest in short-term stability has always been for more DX on the mm-wave ham bands. My best results were running QRSS with <1Hz BW on 241GHz but have often wondered if BPSK would be better than OOK. -Brian, WA1ZMS