[Elecraft] K3: FSK-D vs AFSK

[Joe Subich, W4TV]

> 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.

MMVARI will only work with audio frequencies up to 3 KHz.  The 6 KHz
filter (4.2 KHz max audio frequency in the K3) would be a waste.  You
are better served by using the 2.7 or 2.8 KHz filter with FC=1.60 and
BW=2.80 if you plan to use multiple decoders in MMVARI.

73,

    ... Joe, W4TV


On 10/12/2011 10:19 PM, W0MU Mike Fatchett wrote:
> 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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