Only the embedded hardware (modem) from the German company that owns the rights to this mode, is capable of operating Pactor-III. Use of Pactor-III protocol is limmitted for US hams and some other countries due to the very wide bandwidth of the Pactor-III signal. PACTOR-III is a proprietary mode used for message and traffic handling over an HF radio circuit. Both PACTOR and PACTOR-2 use the same protocol handshake, making the modes compatible more info here. It uses strong logic, automatic frequency tracking it is DSP based and as much as 8 times faster then Pactor. PACTOR II is a robust and powerful PSK mode which operates well under varying conditions. This mode is a major advancement over AMTOR, with its 200 baud operating rate, Huffman compression technique and true binary data transfer capability more info here
It is the most popular ARQ digital mode on amateur HF today. It is designed with a combination of packet and Amtor Techniques. PACTOR is an FSK mode and is a standard on modern TNCs. The non-ARQ version of this mode is known as FEC, and known as SITOR-B by the Marine Information services. With a set operating rate of 100 baud, it does not effectively compete with the speed and error correction of more modern ARQ modes. While a robust mode, it only has 5 bits (as did its predecessor RTTY) and can not transfer extended ASCII or any binary data. These modes may use redundancy or "human processing" to achieve a level of error correction.ĪMTOR is an FSK mode that has been fading into history. For these less complex modes, the TNC (terminal node controller) is replaced by an on-board sound card or out-board audio device. TOR methods that do not use the ARQ hand-shake can be easily operated with readily available software programs for personal computers. Since they share the same method of transmission (FSK), they can be economically provided together in one TNC modem and easily operated with any modern radio transceiver. The main method for error correction is from a technique called ARQ (automatic repeat request) which is sent by the receiving station to verify any missed data.
It is traditionally used to describe the three popular "error free" operating modes, AMTOR, PACTOR and G-TOR. TOR is an acronym for Teleprinting Over Radio. The mode descriptions below are taken from
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