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
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