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Ferry van Eeuwen
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PACTOR
PACTOR-II Here are the key features of the PACTOR-II protocol: In good conditions up to 30 times faster than AMTOR, up to 6 times faster than PACTOR-I. Most robust digital mode: Maintains links in conditions with a signal to noise radio down to minus 18 dB. That means data transfer with absolutely inaudible signals. Proven by a 16 mW link between Europe and Australia! Automatic frequency tracking allows the same tolerance when connecting as with PACTOR-I (± 80 Hz). Newly developed on-line data compression system (PMC) reduces the data by about factor 2. Fully backwards compatible with all known PACTOR-I implementations, including automatic mode recognition and selection. The unit always answers in the mode it's been connected (PACTOR-I, PACTOR-II, AMTOR). Utilizing of the latest coding technology. Constraint-length 9 convolution coding is used with full-frame-interleaving and Viterbi- decoder combined with very efficient Memory-ARQ algorithms. Automatic transceiver output power adaptation to the quality of the HF-link and the actually needed data throughput, when enabled.
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