[RTTY] MMTTY, permanently disable AFC

[John GW4SKA]

Tim,
If it's wandering off '100s of Hz' you haven't got it set up correctly. Just 
follow the good advice from Joe and others, set it up the way you need and 
you will find it works fine.

It is useful when running in a test but make sure it's off when you are S+P.

Cheers, John GW4SKA


----- Original Message ----- 
From: "Tim Shoppa" <tshoppa at gmail.com>
To: <rtty at contesting.com>
Sent: Wednesday, June 18, 2014 2:33 PM
Subject: Re: [RTTY] MMTTY, permanently disable AFC


> G3YYD wrote:
>> With AFSK, when S&P you copy a call and you hit enter to call him. No 
>> need
>> to worry about tuning him precisely so you call him on his frequency as
> the
>> software has done it for you. With FSK you either wait for him to
> transmit again
>> to tune him in or you call off frequency with a lower probability of
> success.
>
> 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
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