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PI4 - PharusIgnis4 - a digital modulation for beacon purposes
Andy Talbot, G4JNT, has described the JT4 and WSPR modes by Joseph Taylor, K1JT,
quite thoroughly. By using the excellent work already done by Andy and Joseph and
all software available the fundamentals are in place and appropriate modifications
can be applied. If you are familiar with Andy's descriptions this document
will seem almost identical.
The document is both a specification and with help to some of the implementation.
PI4 is an ideal digital modulation that is compliant with the IARU Region 1
VHF Committee accepted 1 minute mixed mode beacon sequence.
The name PharusIgnis4 comes from the ancient words for beacon, lighthouse and fire - Pharos
(from Greek to Latin pharus and coming from the Lighthouse of Alexandria),
Ignis (Latin: fire) and 4 for the four FSK tones.
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