LF: WSPR-15 in WSJT-X

[VIGILANT Luis Fernández <luis@vigilant.es>]

Hi LF

Regarding this issue there is an answer from Joe, K1JT

Original message follows

73 de Luis

EA5DOM

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2.  
3. I have received similar requests from a few others. We should probably
4. address this perceived need before too long. I would like to retire
5. WSPR-X, anyway, and do further development within WSJT-X.
6.  
7. I am not persuaded that WSPR-15 is really the best way to go. Here are
8. some potentially important questions:
9.  
10. 1. Is it clear that in practice WSPR-15 provides LF/MF decodes at lower
11. S/N than WSPR-2? If so, ho much lower?
12.  
13. 2. Could an equivalent gain in performance be achieved by having the
14. decoder average several consecutive, properly synchronized WSPR-2
15. transmissions?
16.  
17. 3. If a more sensitive WSPR-like mode is truly needed for LF/MF
18. experimentation, would it be better to create something that for now
19. I'll call "WSPR-MSK", which (like MSK144) uses OQPSK (Offset Quadrature
20. Phase-Shift Keying), a constant-envelope waveform, coherent
21. demodulation, and an LDPC code? Steve (K9AN) and I have discussed such
22. a possible mode, and we might be more motivated to develop that rather
23. than going "back" to WSPR-15. I suspect WSPR-MSK could be made as
24. sensitive (or better) than WSPR-15, even with transmissions shorter than
25. 15 minutes.
26.  
27. -- 73, Joe, K1JT