I came to Ten-tec only three years ago, by which time the old Argonaut had been a collector's item for some time! That said, the old Agonaut should work as well on digital modes as any good SSB transceiver. The only "special" requirement for PSK31 is good stability. It should work fine. 73, Allan, W1AEL, one of the hams at Ten-Tec.