[RTTY] MMTTY AFC Bug

[Joe Subich, W4TV]

> I'll be running, give my exchange and then suddenly I can't find the
> other station. I notice that AFC has slipped off,

Are you sure AFC is turning off (being disabled) and not retuning
due to an interfering signal or noise?  I've long noticed AFC will
"move" the receive frequency in response to noise with or a strong
"adjacent channel" signal.

The AFC behavior is another reason that I use FSK and keep AFC OFF.
I do all my tuning with the main knob (in "S&P") or RIT (in "Run").
In my opinion, AFC is a waste of code.  However, if you *MUST* use
it, set the SQ parameter higher (reduce the chance of tuning on
noise or weak interfering signal), set sweep to 0.5 to limit the
tuning range and increase Time to slow its action.

73,

    ... Joe, W4TV


On 1/9/2011 7:37 AM, Dick Flanagan wrote:
> I am running MMTTY 1.68A with the latest Writelog.  I'll be running,
> give my exchange and then suddenly I can't find the other station.  I
> notice that AFC has slipped off, punch it back on and stumble
> on.  I'm wondering if there is a limit to how far the AFC can pull a
> signal without turning itself off.  This happens regularly, at least
> once or twice an hour.  Needless to say, it causes a serious kink in
> my rhythm every time it does that.
>
> I'll have more after the RU and I've had a chance to get some *real* sleep!  :)
>
> Dick
>
> At 11:35 PM 1/8/2011, Dave AA6YQ wrote:
>   >>>>AA6YQ comments below
>   >
>   >-----Original Message-----
>   >From: rtty-bounces at contesting.com [mailto:rtty-bounces at contesting.com]On
>   >Behalf Of Dick Flanagan
>   >Sent: Sunday, January 09, 2011 2:18 AM
>   >To: RTTY contest group
>   >Subject: [RTTY] MMTTY AFC Bug
>   >
>   >
>   >Is there a fix for MMTTY randomly turning AFC off?
>   >
>   >>>>Yours is the first report of this behavior I recall seeing, Dick. How
>   >frequently is this happening? Are you running MMTTY standalone, or as part
>   >of another application? What version of MMTTY are you running?
>   >
>   >    73,
>   >
>   >        Dave, AA6YQ
>
> --
> Dick Flanagan K7VC
> dick at k7vc.com
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