[RTTY] MMTTY, permanently disable AFC

[Tom Osborne]

Hi Tim

I find pretty much the same thing you mention here about AFC.

I think it would be a good think if it worked right, but for some 
reason, I find if I check the 'AFC off/on with CQ' box, it sometimes 
turns itself on, but doesn't turn off. when I go to S&P.  Then I find 
myself calling stations and them not coming back because I'm off 
frequency.  Then I have to hit the 'Ham' button to get back to normal again.

If would turn itself on when CQ'ing and turn off when S&P, it would be a 
good feature.

I find it best just to leave the 'off/on' button unchecked.  Ed had a 
good hint about going to MMTTY and setting AFC=0 in the usarpara.ini 
file.  73
Tom W7WHY



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Tim Shoppa wrote:

I think you work your VFO knob differently than I do. My ears and the 
computer are set to standard 2125Hz frequency. Tuning aids like the 
waterfall and especially the MMTTY X-Y scope are incredibly useful with 
AFC off, I can tell from the tilt of the X-Y exactly what fractional 
revolution I have to turn the VFO knob.

Tuning in to last partial letters of a call and completing the Q in a 
sprint, tuning is simply not a problem. All the above is true, until AFC 
accidentally gets turned on. Next thing I know I am hearing the right 
tones but seeing nothing on the X-Y scope. MMTTY has wandered off into 
hyperspace and it has decided to "correct" center frequency, way out of 
my receiver's passband.

I will see if some of the suggestions offered here make it usable, plan 
to try them in Thursday night sprint. I find MMTTY AFC to be very 
counterproductive to tuning in a RTTY signal "right". MMTTY decides to 
start wandering the center frequency and next thing I know the X-Y scope 
is no longer centered on standard 2125Hz but is hundreds of Hz off, and 
all the coordination between my eyes, ears, and fingers on the VFO knob 
goes right out the window.


This is very disconcerting. 2Tone's "rubber band" AFC and waterfall 
always showing pips for the ideal frequency, seems a little closer to 
how I work. Tim N3QE