[RTTY] MMTTY, permanently disable AFC

[iw1ayd - Salvatore Irato]

Well, thats great to learn agn about MMTTY. Several things get loose 
without repeated use/checks ...
I still use it and I will use it, with my two K3, in FSK. That's too 
easy to have an operator that mismatch something with AFSK during 
contests. That's to easy to get a signal on P3, "spin" the VFO and 
continue inside the MMTTY waterfall to get onto it, as to check which 
one rich multiplier is him or not. Then I should make a Mark, call not 
recognized, or a Store, call recognized, or even try to catch on his 
timings to call him. All those actions depending on what's going on and 
other contests/operators/setups requirements.
It wouldn't be an easy task, like the one described, to catch him 
without the bigger MMTTY waterfall and its scope. That's what I 
discovered myself doing.
Ears also help a lot, even on SO2R, one radio with Mark at 2125 Hz and 
the other with Mark at 1275 Hz.
I'd started FSK with MMTTY, that's another of the maybe I wouldn't use 
2Tone as the main RTTY window right now.
Usually my profile on MMTTY is only one, well nailed down, no AFC and no 
other fancy things, FIR filters and all other parameters pretty 
standard. Often I have had on hands very old and not performing PC ... 
standard FIR parameters could deal with the 97% of signals. The two 
2Tone companions decoder, I have a grand total of six decoders running 
SO2R, printout very well and leave me the ability to discover known 
calls pattern the 99.00 % of times. Over 24 or 48 only few signals get " 
... pse come back later on"  ...
Even on 500 Hz K3 filters. The two 2Tone windows are set one  and one 
flat and one flutter, those two also contribute very well to solve that 
big estimated number of cases.
I didn't used that much at all the Dual PBT or TPF audio enhancer 
filter, but often I see other operator sill using it, event if MF aren't 
too tight, I men even at 500 Hz. Where I catted out the DSP entrance 
point for the 400 Hz 8 pole filter of the K3. The 250 Hz 8 poles is 
incoming at 300Hz, it's much needed when the rattles comes in.
About rattles, may everybody knows what I mean - those OM with large 
signals - not anyway too strong but often large more than the right ... 
I have to admit that since the great job that Elecraft had done on the 
FSK TX signal inside the K3 RTTY generator I have more and more problems 
from rattling operators. It's happening more and more times now, since 
that K3 change, that rattling operators come on my signal. Maybe this is 
just a personal perspective, due to more strict observation on K3, due 
to the great effectiveness of the operations. Due to propagation 
condition that drive, over their changing behavior, some part of the 
world in between me and my target of the moment.
But, anyway, the large waterfall and the scope of MMTTY are the last 
mile drivers for my attention when tired and still having to operate 
bottom on the chair.
I could learn different techniques, a wish is often must to understand, 
maybe looking at the P3 and having some macro to drive its windows 
spanning. This will keep me out of action focus having to search for the 
macro button, until I don't learn the new gesture.
So by now it's much more easy to continue on the known road. Main decode 
MMTTY with two companion 2Tone windows. All with different filtering as 
to catch all those nice signal out and inside the log, seamlessly  at 
any time. All the right jobs are done, easy, for me. I need all the two 
things, hope I could use all the two for a lot of great contests. I.e OS 
changes, different interfaces, rigs, whatever reasonably could come to mind.

BTW I don't think that AFSK is bad, just it is not seamless  from start 
to end of any contest, for any operator, for any case, band by band, 
setup by setup ... and at least for me when I am tired after hours and 
hours of pure joy and in need to stay there more. Lastly, why bother 
with K3 when peoples get too often onto my signal. Hope not to be too 
quick and dirty with my poor English.


                73 de iw1ayd Salvo

PS I'd prefer NFS over LM, for work with those.