[Elecraft] K3: FSK-D vs AFSK

[W0MU Mike Fatchett]

FSK is super simple to get going.  No adjustments of audio etc.  Let the 
K3 do all the work.  MMAVARI allows you when using N1MM to have up to 24 
decoders going at the same time.  While they may say up 2-10 the 
decoders are probably only seeing the bandwidth of the radio which could 
be 6k with the filtering etc.  The P3 will easily show you the 
activity.  Not who worked the DX.  You can tune around and listen for 
the proper timing or run two instances of your RTTY program and tune 
with the 2nd vfo in hopes of spotting the last worked station.

That said..........

When I get on from J6 and operate RTTY I will have the decoders going so 
it would be better to stake out a freq and call instead of trying to run 
around the pileup.  I think you will see more of this in the future.  
Very cool technology at work!

Mike W0MU

J6/W0MU November 21 - December 1 2011 CQ WW DX CW
W0MU-1 CC Cluster w0mu.net


On 10/12/2011 7:34 PM, Jim Miller wrote:
> I played a bit with FSK-D and AFSK today. I was able to get FSK-D to decode
> and display on the PC via the K3 Utility Terminal tab.
>
> While listening to T32C working a split RTTY pack I realized that trying to
> figure out which was the most recent worked station was a bit more difficult
> than doing it for CW, especially since the UP distance was 8-9Khz.
>
> I thought AFSK and display of the sigs on the PC screen might be of benefit
> but after putting it all together I realized that the bandwidth of the audio
> out would limit the spectrum to less than 4Khz.
>
> So what's the benefit of AFSK over FSK-D?
>
> Any suggestions for finding the last station worked in a pack?
>
> TIA
>
> Jim ab3cv
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