[Elecraft] K3 FSK

[Julian, G4ILO]

AF4OX wrote:
> 
> I am setting up my K3 for FSK.  I use Writelog for contest software.  I
> use PTT on COM1 and use COM2 to generate FSK, connecting through a NPN
> transistor interface to the K# FSK IN.  I am able to print fine via the
> MTTY plug in for Writelog.  However, when I transmit, the carrier from my
> K3 seems to be varying as indicated by the power output meter and if
> connected to my amp, the analog meter on the amp also indicates varying
> output as MARK-SPACE commands pass.  I am in DATA, FSK D.  I suspect that
> I have something else improperly configured or selected.  I can make
> contacts, but varying carrier level out is not normal compared to other
> radios I have used in FSK.  Any suggestions???
> 
This was last discussed a couple of weeks ago. I think the reason for this
is that the K3 does FSK by generating audio tones in the DSP. These audio
tones must pass through the SSB filter and what you are seeing is the effect
of ripple in the filter passband. Other radios, I guess, generate a FSK
carrier the same way they do for CW and actually frequency shift it.

You could look back in the archives to see if there was any solution - all I
can remember was the suggestion that the 8-pole filter has less ripple.

-----
Julian, G4ILO. K2 #392  K3 #222.
* G4ILO's Shack - http://www.g4ilo.com
* KComm - http://www.g4ilo.com/kcomm.html
* KTune - http://www.g4ilo.com/ktune.html

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