Absolutely nothing.  You can work PSK31 with just the basic K3 either directly 
with 
your CW paddles using data mode PSK-D, or with your favorite software with a 
couple 
audio cables between the K3 and the computer soundcard.  You can set up PTT 
using 
the same K3 RS232 connection to the computer.

-------------------------
73,
Greg - AB7R
Whidbey Island WA
NA-065


On Fri Mar 13  6:09 , Jay  sent:

>About to order the KRX3 and upgrades for my #1288 and would like to work 
>psk31 off my computer screen.... Do I need to order anything else or 
>specific software to make this happen?
>Thanks.  W6JDB
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