- PACTOR-III is a software upgrade for existing PACTOR-II mod
ems that provides a new data transmission mod
e for improved speed and robustness. PACTOR-III is not a new mod
em or hardware device. Most current PACTOR-II mod
ems are upgradeable to use PACTOR-III via a software update since PACTOR-II firmware accommod
ates the new PACTOR-III software
- PSK31 is a digital communications mod
e which is intended for live keyboard-to-keyboard conversations, similar to radioteletype. Its data rate is 31.25 bauds (about 50 word-per-minute), and its narrow bandwidth (approximately 60 Hz at -26 dB) reduces its susceptibility to noise.