Thank you Joe for responding. I like your idea of developing a "wspr-msk" mode that could be used and hopefully be able receive a decode faster than the 15 minutes that wspr-15 now provides.
>From what I can tell in the past, wspr-15 did seem to provide decodes at lower s/n than wspr-2. I have received Germany in the past on wspr-15 at 2200m but no transatlantic what so ever at the 630m wspr-2 band from my location here in Western Illinois. I would love to see that changed! 73 Jay KA9CFD -----Original Message----- From: Joe Taylor [mailto:[email protected]] Sent: December 19, 2016 21:04 To: WSJT software development <[email protected]> Subject: Re: [wsjt-devel] Adding WSPR-15 mode to WSJT-X Hi Jay, On 12/19/2016 3:38 PM, Jay Hainline wrote: > Since WSJT-X 1.7.0 has now been released for general availability, I > would like to request WSPR-15 be added to the list of modes in WSJT-X. > There are still a number of experimenters in the Lowfer community that > still would like to use this mode. However its only available in > WSPR-X which has some age to it and is very buggy. My version tends to > stop running and freeze up after a period of time and is very > unreliable on my Windows 10 64 bit computer. How difficult would it be to add this mode to WSJT-X? > > Is there a competing digital mode that would be better to use for the > lowfer experimenters that would give the same sensitivity given the > bandwidth restrictions that is available in the low frequency and very > low frequency range of the radio spectrum? One of these days, the FCC > is going to authorize amateur use of the 630m and 2200m bands. It > would be nice if the WSJT suite is ready for it. I have received similar requests from a few others. We should probably address this perceived need before too long. I would like to retire WSPR-X, anyway, and do further development within WSJT-X. I am not persuaded that WSPR-15 is really the best way to go. Here are some potentially important questions: 1. Is it clear that in practice WSPR-15 provides LF/MF decodes at lower S/N than WSPR-2? If so, ho much lower? 2. Could an equivalent gain in performance be achieved by having the decoder average several consecutive, properly synchronized WSPR-2 transmissions? 3. If a more sensitive WSPR-like mode is truly needed for LF/MF experimentation, would it be better to create something that for now I'll call "WSPR-MSK", which (like MSK144) uses OQPSK (Offset Quadrature Phase-Shift Keying), a constant-envelope waveform, coherent demodulation, and an LDPC code? Steve (K9AN) and I have discussed such a possible mode, and we might be more motivated to develop that rather than going "back" to WSPR-15. I suspect WSPR-MSK could be made as sensitive (or better) than WSPR-15, even with transmissions shorter than 15 minutes. -- 73, Joe, K1JT ---------------------------------------------------------------------------- -- Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today.http://sdm.link/intel _______________________________________________ wsjt-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/wsjt-devel ------------------------------------------------------------------------------ Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today.http://sdm.link/intel _______________________________________________ wsjt-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/wsjt-devel
