Belated reply:
The ISS and Tianhe (CSS) should have reliable S-Band CCSDS signals.
any other satellites listed here such as Iceye, MetOp, Proba, KompSat, Asnaro, JPSS, SMOS, PAZ, Jason-3, Saral, MATS, Hodoyoshi, Cheops, Cassiope, GOES, Sicral, Dove-4, Hysis, WSF-M1, ASO-S, StriX, QPS-SAR, Umbra, AAC-AIS-SAT, & NeonSat-1.
Frequencies for some of these are already listed in the SatNogs DB.
And others can be found here.
Other options include:
ESA Ops-Sat
And for DVB-S:
Sonate-2
Bluewalker 3
ISS on HamTV tests maybe be scheduled soon