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From: John Andrews <w1tag@charter.net>
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Date: Mon, 27 Mar 2017 10:03:42 -0400
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Subject: Re: LF: WSPR-15
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Stefan,

An email exchange with Joe Taylor at the start of this year indicated 
that his group thought that WSPR-15 was a "dead end", and they planned 
no further development on it. Rather, they were talking about:

"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."

I haven't followed up on it, other than to give him initial 
encouragement. I notice that Andy Talbot has posted an inquiry today on 
the WSJT development group reflector, so that might produce an update.

John, W1TAG

On 3/27/2017 9:07 AM, DK7FC wrote:
> Hi Paul,
>
> I've never had serious problems with the WSJT-X software running in
> WSPR-15 mode. However they did not continue to develop WSPR-15 since
> some years. For example the multi-pass decode option is not available
> for WSPR-15, a pity. Obviously they lost their interest, because it is
> 'just' LF, and there are not many users. If i remember correctly it was
> 2012 when i've been in contact with K1JT to talk about WSPR-15. That was
> the time he released the mode. He even was a member of this group for
> some time in that year. So i would assume they rather want to drop their
> interest in that mode for the future. Anyway we can use the old version
> which has of course the same performance than in 2013...
> One can assume an improvement of up to 9 dB, in theory and practice...
>
> 73, Stefan
>
> Am 27.03.2017 13:22, schrieb N1BUG:
>> On 03/27/2017 03:08 AM, Alex R7NT wrote:
>>
>>> I'm more interested in WSPR15 vs WSPR2 vs OP32 :-)
>>> What are the ideas about this?
>>>
>>> I believe WSPR15 is better against WSPR2 on LF for long distances in
>>> the usual propagation
>>
>> Hi Alex.
>>
>> I am very interested in WSPR15.
>>
>> Unfortunately the only WSPR15 decoder seems to be WSPR-X software
>> which many of us cannot use. It is always crashing, freezing, stopping
>> on many PCs.
>>
>> If someday the developers put WSPR15 in the stable WSJT-X software (or
>> someone writes another decoder software) then I think it has a chance
>> to become more popular. I am waiting!
>>
>> When (if) there is a stable decoder I will listen for WSPR15 in
>> parallel with WSPR2.
>>
>> 73,
>> Paul N1BUG / WI2XTC
>> FN55mf
>>
>>
>>
>
>