Re: [WriteLog] What's wrong with AFSK? was - 5 bit mystery unraveled

[Jerry Pixton <jpixton@shentel.net>]

Jim,

The post this morning is just one reason in favor of FSK. No audio 
feedback. A second is that often the Mike Gain control is right next to the 
Audio Gain controls. I have probably turned down the Mike Gain a thousand 
times when I was reaching blindly for the Audio Gain control. Third you 
don't have to work about the ALC levels adjustment as you change things on 
the sound board. Just several examples of why FSK is easier. On the 
downside, you have to use standard tones.

Jerry, W6IHG

With one radio still using FSK and one now that I had to switch to AFSK





At 11:47 PM 2/29/2004 -0800, Jim Smith wrote:
> It seems to me that the cognoscenti prefer FSK to AFSK.  I have never seen 
> any reasons for this preference, probably because I haven't looked in the 
> right place.  So, what's the problem with just sending AFSK to the radio, 
> thereby eliminating the need for an AFSK to FSK converter?
>
> Bill Turner wrote:
>
> > On Sat, 28 Feb 2004 06:50:04 -0600, Bob Naumann - N5NJ wrote:
> >
> >
> >
> > > For the time being, if you want to control your radio, and you want to 
> > > run FSK, you will need 2 serial ports.
> >
> > _________________________________________________________
> >
> > I wonder if it might be possible to make an AFSK to FSK converter?  A
> > simple detector which would be driven from the soundcard output,
> > detecting the mark and space audio tones and converting them to a DC
> > level suitable for driving the FSK input?  Perhaps a PLL type circuit?
> >
> > It might miss a cycle or two of the 2125 Hz audio during switching, but
> > I doubt if the timing is that critical.  What do you think?
> >
> > --
> > 73, Bill W6WRT
> > QSLs via LoTW
> >
> >
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>
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------------------------------------------
Dr. Jerry R. Pixton, PIXOS Designs LLC
http://www.pixos.com/designs/RadioTuner/
jpixton@shentel.net
------------------------------------------


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