13018Re: [wsjtgroup] Re: WSJT-X For Backpacking To Rare Grid
- Jul 23, 2014Hi Jim,
> I did study the doc file, and all I could find was "JT65 signals oftenFrequency stability, yes. Also, for EME use the JT65 decoder needs to
> decode correctly even when they overlap. Such behavior is much less
> likely with JT9 signals, which fill their occupied bandwisth more
> densely. JT65 may also be more forgiving of small frequency drifts." Is
> frequency stability the only hazard, or is there more?
allow for changing EME Doppler over the duration of a transmission. And
any propagation-induced Doppler spreading will be proportionally larger
at higher frequency.
> On 6M, I'veThis is normal, and applies to both JT65 and JT9. With signals somewhat
> observed that I get decodes of JT9 signals when I've tuned to the
> frequency a bit late in the cycle, or when the other station started TX
> a bit late.
well above the normal threshold, good decodes can be obtained even when
significant portions of the transmission are absent.
-- Joe, K1JT
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