We should ALL answer this, with copies to K1JT and K9AN and/or the
wsjt-devel list!!!

I personally don't like the averaging idea.

I am not technically knowledgeable enough to comment on the last
part, but I will stress that any practical replacement for WSPR-15
needs to be OK on *non*-linear amplifiers. That is all most of us have.

I will work up a proper reply to be sent to Joe/Steve/wsjt-devel
tomorrow.

73,
Paul N1BUG



On 11/22/18 4:49 PM, VIGILANT Luis Fernández wrote:
> Hi LF
> 
> Regarding this issue there is an answer from Joe, K1JT
> Original message follows
> 
> 73 de Luis
> EA5DOM
> 
> 
>   1.
> ###########################################################################
>   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