1200 baud AX.25 packet is legal uplink for PSAT's 28.120 USB uplink and 435.350 downlink (unless I misread the rules). SO I will say that such experiments are welcome on PSAT as long as there is little to no other PSK31 activity
Winter has set in for Chicago before I had a chance to get an antenna put up for 28.120 MHz. But I've been occasionally monitoring the 435.350 MHz downlink. PSAT's PSK-31 beacon on the downlink is strong (a lot stronger than the 145.825 downlink).
I've been using FLDIGI (it's free) for receiving PSK-31 in my shack. Besides the beacon there is plenty of empty bandwidth during a pass on the waterfall display. Give 435.350 a listen to start getting used to the characteristics of this satellite.
-- 73 de JoAnne K9JKM k9jkm@amsat.org