[Elecraft] Difficulty with PSK

[Don Wilhelm]

Tom,

Since this question keeps coming up, perhaps the manual should be 
enhanced to educate users about terms such as ASCII that are commonly 
used for data transmission.
See page 31 of the K3 manual, and you will find that PSK D is only used 
for ASCII and paddle input to the K3.
Your application is most likely using soundcard generated tones.  
Therefore, you must use DATA A or (for RTTY) AFSK A.  Very few 
applications send ASCII data for PSK operation.

I believe that is your entire problem.
I am not sure how you have your RTTY set up, perhaps the application is 
sending ASCII data over the RS-232 interface and therefore will work if 
the K3 is set to FSK D - you did not give those details.

If your application is sending ASCII data, there is no need for the 
cables to the soundcard nor is there a need for any interface box with 
the K3.  FYI, the K3 has the equivalent of a soundcard data interface 
box built-in, you only need two stereo cables from the K3 LINE IN/OUT 
jacks to the soundcard LINE OUT/IN and an RS-232 cable from the computer 
to the K3.  Adding a separate interface box only complicates the shack 
and the operation.

73,
Don W3FPR

tom wylie wrote:
> ...
>
> I have the K3 set to Data Mode - PSK D  31bps
>
> I am using the official Microham interface to radio leads connected to 
> Line in / Line Out.
> I have set the levels admittedly using RTTY....
>
> ASs I said everything works fb in RTTY.
>   
> ...