[Elecraft] FSK problem with my K3

[Don Wilhelm]

Jerry,

I just looked at the fldigi files on the web, and it appears that fldigi 
does not do FSK, but all its RTTY operation is in AFSK.  If that is the 
case, you will need to connect the soundcard to the line in and line out 
connectors on the K3 rather than connecting to the ACC connector pin 1.
See http://www.w1hkj.com/FldigiHelp/RTTYFSK.html for the source of my 
information it states that "All of the modem signals that fldigi 
produces are audio signals."

If you have implemented the circuit shown in 
http://www.w1hkj.com/FldigiHelp/PseudoFSK.html to produce Pseudo FSK, it 
does state that you may have to invert the sense of the keying signal.  
A second 2N2222 stage like the one shown should accomplish the inversion.

73,
Don W3FPR

n2uz wrote:
> Hi all,
>
> First of all, I prefer to use FSK instead of AFSK.  ASFK works fine.
>
> My problem is that I have the wrong polarity coming out of my rtty
> program (fldigi under linux). It is hooked up to pin 1 of the ACC 15 pin
> connector. It is changing polarity fine (looking at it with my oscope.
> How can I invert it in the K3?  I tried the CONFIG param FSK POL  and
> that does not do it.  I read an email on the archives saying that the
> config item FSK POL  does not work.  If that is the case, when will it
> be fixed?
> I have the latest code 2.78.
>
> On the air I get no print from other hams.  As a test I use my K2 with
> another pc to check and ASFK is fine by garbage with FSK.
>
>
> Jerry, N2UZ
>
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