[600MRG] WSJT-X 1.9 v 1.8 second night

[WM3M]

Appreciate the info.

Some informal additional info, yesterday I downloaded ver 1.9, ran WSPR 
receive all night and for first time copied several stations in Europe.

Thank you  73

Emory   WM3M

On 2/27/2018 8:39 AM, N1BUG wrote:
>
> Last night 1.9 continued to have a clear advantage but by a much
> narrower margin that the first night.
>
> In 12 hours ending 1100z:
>
> LF 178 decodes with 1.9, 174 with 1.8
> MF 890 decodes wtih 1.9, 838 with 1.8
>
> Maybe propagation is the reason? Joe Taylor offered this information 
> regarding the new WSPR decoder:
>
> ...
>
> You may be interested to know a bit more about how this enhancement
> works -- and why it's so effective at LF and MF but provides little or
> no advantage at HF.
>
> All of the JT modes use continuous-phase frequency-shift keying (CPFSK),
> but with the exception of MSK144 the software demoduators estimate
> soft-symbol values independently for each symbol interval. In other
> words, we generally do not take advantage of the phase continuity that
> should exist across symbol boundaries. The new WSPR demodulator treats
> received data coherently in blocks up to 3 symbols long. If the radio
> channel is stable enough, we find the resulting WSPR sensitivity
> threshold is approximately -31.5 dB.
>
> The scheme provides no benefit at HF because even a block size of two
> symbols (about 1.4 s) generally exceeds the coherence time of the HF
> channel.
>
> ...
>
> My parallel 1.9 vs 1.8 test will continue on both LF and MF.
>
> 73,
> Paul N1BUG
>
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