Wes,
you're taking that out of context. The structured messages allow for
redundancy if some of the original message is missing. The decoder can
take the sync symbols so that the system can understand what type of
message it is, it still needs the callsign and signal report.
More details can be found here:
https://physics.princeton.edu/pulsar/k1jt/wsjtx-doc/wsjtx-main-1.9.1.html#PROTOCOLS
and here
https://physics.princeton.edu/pulsar/k1jt/FrankeTaylor_QEX_2016.pdf
which covers JT65, but which forms some of the basis for the other JT/FT
protocols.
Neil, KN3ILZ
On 7/3/2018 5:16 PM, Wes Stewart wrote:
In a message to this group back in February I wrote:
Quoting G4WJS: "For FT8 the net effect is that
up to about 5 seconds of a message may be missing yet still
be decoded. The amount missing can be either a truncation or
parts of the message below the decoding threshold. The FT8
message is structured with sync symbols at the start, middle
and end so missing the start or end may have less impact
than missing other parts since mostly sync symbols may be
lost and they contain no message information."
Hence, I dubbed the mode, "Imaginary" since it hears things that
aren't there.
Wes N7WS
On 7/3/2018 12:36 PM, Wayne Burdick wrote:
Overheard yesterday on 40 meter SSB, in reference to FT8: “Given the
level of automation and whatnot, maybe they should call it ‘magic
radio’ instead of ‘ham radio’.”
New contest category?
Wayne
N6KR
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