In the Amateur Radio Enthusiast LinkedIn group, Joe, W5FJG says:
KC4AAA – Amundsen – Scott South Pole station has begun digital operations. We are up on JT65, PSK-31 and RTTY. We have completed testing and have worked a hand full of stations. We tend to operate now, from 0200 to 0300UTC, as it seems to be the best time for propagation into North America. I have been up around 1500 UTC, working into Europe. Look me up on QRZ and follow KC4AAA on Facebook. We intend to give more info on operating times and freqs. We also operate CW.