I wonder if anyone has come up with better Profiles for flutter, etc?
In my experience, older versions of MMTTY, from 2-3 years ago, worked
better on fluttery/multipath signals (such as east coast to JA). I
don't know enough about the software to "roll my own."
73,
Barry
On 20 Oct 2003 Jon Harder wrote:
> I'm a long time MMTTY user who has been captivated by this wonderful
> software from the first release right up to the current version. Thanks,
> Mako-san!
>
> After some recent startling experiences, I felt I should alert MMTTY users
> (stand-alone or
> under any software combo) that their Profiles settings need to be carefully
> checked from time to time, as some of the profile "default" settings appear
> to turn
> on NET and AFC, as well as sometimes altering HAM values. The user wouldn't
> necessarily know this - as when the Writelog plugin is set not to show the
> buttons on
> the MMTTY control panel, or with "MMTTY engine" only software like YPLog
> and Hamscope which show only a limited tuning display. The results can be
> chaotic. Here's what I mean.
>
> It's easy to select a special profile (like MultiPath or Flutter) in the
> heat of contest conditions and not realize what has happened to some vital
> settings like your basic tone preferences unless you have carefully
> optimized and saved a profile that fits your own receiving needs. The MMTTY
> Help file tells exactly how to do this.
>
> And what's wrong with having NET or AFC turned on? Mainly it's the risk of
> not listening on your own transmit frequency. This can be fatal during
> contest conditions. If you're using FSK only, as I do, your transmit
> frequency is unaffected, but MMTTY may not be able to decode another
> station's transmission, or even know that he or she is calling, unless you
> have the receive passband open far too wide for comfortable copy, especially
> during a contest. Neither NET nor AFC are of practical use in fast-paced
> exchanges.
>
> As W7TI recently commented:
>
> "It would seem to me that the best approach would be to:
>
> 1. Never have NET on at all.
> 2. Leave AFC off when S&P'ing.
> 3. Have AFC on only when CQ'ing.
>
> With all the other things going on in a contest perhaps this is too
> much to ask, but it should go a long way toward alleviating the
> off-frequency response problem. "
>
> I definitely agree!
>
> As an op who prefers "low tones," 1275/1445 Hz, I was startled to find that
> accidentally picking one of the un-optimized "default" profiles had changed
> my demod pitch to 2125/2295 high tones without my being aware of it until
> the decoder just would not copy a strong signal. That led me to check
> things out in the Options/Setup tab, reset them, and then to completely
> review all my profiles to be sure that HAM would always give me the low
> tones I'm used to.
>
> The text file UserPar.INI in the MMTTY directory holds the profiles, and
> after confirming my desired settings for each one via the Options/Setup tabs
> and resaving it in the Profiles/Assign Menu dialog, I've just copied
> UserPar.INI into other software directories which use the engine inside
> their programs for RTTY (YPLog and HamScope in my case.) This way things
> should behave pretty much the same in all the programs where you use this
> terrific program, including stand-alone MMTTY.
>
> Once more, great appreciation to Mako-san for a true labor of love in giving
> the world of "steam RTTY" a new burst of life.
>
> Very 73,
>
> Jon K1US
> into RTTY since 1970
>
>
> _______________________________________________
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> WriteLog@contesting.com
> http://lists.contesting.com/mailman/listinfo/writelog
> WriteLog on the web: http://www.writelog.com/
--
Barry Kutner, W2UP Internet: w2up@mindspring.com
Newtown, PA Frankford Radio Club
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