Posted by
Jim Brown-10 on
Jul 17, 2017; 4:29am
URL: http://elecraft.85.s1.nabble.com/Flash-mob-experiment-21040-5-kHz-now-until-2100-Z-tp7632437p7632517.html
On 7/16/2017 10:54 AM, Christopher Hoover wrote:
> JT65 can decode arbitrary messages down to -24 dB (and certain messages
> down to -32 dB).
When functioning as a multi-decoder, late versions of WSJT-X often give
me good decodes in the range of -24 to -29dB re: the full bandwidth
noise floor, and they also include second-pass decoding for signals
missed during the first pass. It is, for example, common to decode 2-3
responses to the same CQ, all within a few Hz of each other. Second pass
decoding subtracts out the decoded signals and then decodes what's left.
Particularly impressive was what happened when a W7-area station was
calling JA7QVI on 6M, but got out of sync so that he was calling on the
same cycle as JA7QVI. Both stations were decoded on consecutive passes,
even though the W7-area station was 10-12 dB louder and nearly zero beat!
JT65 often decodes signals that overlap each other. FT8 does not, but
FT8 signals only occupy about one-quarter the bandwidth of a JT65 signal.
73, Jim K9YC
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