"A standard amateur callsign consists of a one- or two-character prefix,
at least one of which must be a letter, followed by a digit and a suffix
of one to three letters."
Worldwide radio callsign allocations are defined by ITU RR list. Hamradio
follows that with few exotic exceptions.
Even ITU made 2 special cases with 3D Swaziland/Fiji and SS Egypt/Sudan
fortunately not used so far!
I used ITU and DXCC lists for simple callsigns decoding in 1980’s covering most
of the special cases occurring since.
I fail to understand how K1JT squeezed 3DA0AY in 17 bits while 3XY4D fails?
Prefix and suffix formats are the same!
I thoroughly enjoy FT8 since July 18. 1K+ QSO made on 5 bands, 165 DXCC
logged. K1JT caught on 40 m!
73 de Mario, S56A, N1YU
P. S. GL with Fox & Hounds 😊 Big mess expected with 3Y and KH1.. I left
Baker island in 2002.
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