Mt-63 technical description
- The MT-63 modem, constructed around a high speed DSP processor, either in a dedicated external DSP unit like the Motorola EVM, or in PC soft
ware using the PC sound card, transmits 64 tones spaced 15.625 Hz apart, in the 1 kHz bandwidth.
- The Olivia transmission system is constructed of two layers: the lower, modulation layer is an (almost) classical Multi-Frequency Shift
Keying (MFSK) and the higher layer is a Forward Error-Correcting (FEC) code based on Walsh functions.
- PACTOR-III is a soft
ware upgrade for existing PACTOR-II modems that provides a new data transmission mode for improved speed and robustness. PACTOR-III is not a new modem or hardware device. Most current PACTOR-II modems are upgradeable to use PACTOR-III via a soft
ware update since PACTOR-II firmware accommodates the new PACTOR-III soft