Loran C Phase coding
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4-4-100
Phase coding (in Loran C)
The shifting in a fixed sequence of the relative phase of the carrier cycles between certain pulses of a group this facilitates automatic synchronisation in identical sequence within the group of eight pulses that are transmitted at each repetition interval.
It also minimises the effect of unusually long skywave transmissions causing one pulse to interfere with the succeeding pulse in the group received by groundwave.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
