Fine tweaking of the software timing has reduced any long term timing drift to well within MEPT_JT parameters. In reality its stability outstrips my shack computer when it is free running, (no time sync from the Web).
I have changed the name of my coding to avoid confusion. Whilst I am happy to have bits of binary code and bits of chewing gum in the same sentence, I can see that it could cause problems. Equally the system is 5 tone, I have gone for RTTY terminology of units.
It is now 5 Unit Multiomde + WSPR
All of the coding is based on MEPT_JT elements 682.66mS long. A QRSS3 Dot in theory 3 Seconds long is in fact 4*0.68266 Seconds = 2.73064 Seconds a QRSS3 Dash, 9 seconds in theory is 13*0.68266 = 8.87458 Seconds.
S/MT Hell Characters are produced by elements of MEPT_JT code. A 5th element is produce by an extra 3rd Binary bit.
All spaces are multiples of 0.68266 seconds apart from one filler, for accurate 2 Minute slot timing, just prior to the start of the MEPT_JT data and after the 2 step waveforms. The Steps are produced by the 5 element tones spaced precisely 😉 1.46484375Hz apart and 4 elements long. Originally I had a 5-4-3-2-1 countdown with 5 of these. Now just 2-1, as they convey no real information. The top of step 1 is twice the length of step 2.
My WSPR Data starts at 1.36532 Seconds past the even minute, 2*682.66mS, as near to 2 seconds as the elements allow, although the 2 Minute filler can place this where ever it likes.
Paolo IZ1KXQ produces some fine screen shots of my signal.
EDIT March 2018
MEPT_JT was the development name of what became WSPR. It arrived as yet another QRSS mode and shared the same frequency Window with QRSS. I was there right from the first day and enjoyed the testing and development of a new mode.
nSoon it became obvious that would out grow QRSS activity and needed to be relocated, just above the QRSS Window seemed the logical slot. At the time it was asked “what is QRSS” and it took quite some debate and persuasion by Knights QRSS to get MEPT_JT / WSPR evicted from the QRSS slots to protect the relatively small number of QRSS users and Grabber operators.
Like many new things WSPR caused factions and I named it Ssshh mode because it was frowned upon to speak about it. As you can see I embraced both and the modern use and support of WSPR is a testimony to the usefulness of the mode.