Pactor II is DSP based and is as much as 8 times faster then Pactor I. A Pactor Level II signal features 2 tones w/200Hz shift using baud rates of 100 or 200 fitting into a 500Hz channel. Pactor II is a half-duplex synchronous ARQ system and designed to be backward compatible with the older Pactor Level I protocol.
The system can handle raw 8 bit data and ASCII compression with HUFFMAN or MARKOV method Depending on band conditions the data throughput can be increased by changing the modulation form used. Maximum throughput is 800 bps.
CODE300-32's version is able to decode all user groups
This example shows a typical PACTOR II mesage, users group ICRC
A PACTOR II message with Time Date Stamp enabled