Simple two by two tenth inch plugs wired to a 3.5mm inline jack for front 
paddle plug. Pinout on Fred's book. 

Sent from my iPhone
...nr4c. bill


> On May 22, 2014, at 4:29 PM, Jim Brown <[email protected]> wrote:
> 
>> On 5/22/2014 12:51 PM, Pete Smith N4ZR wrote:
>> I understand that the KX3 does not have the K-3's built in CW and PTT 
>> interfaces on the RS-232 port, but it is really trivial to take off the DTR 
>> and RTS lines from the RS-232 cable and through a couple of one-transistor, 
>> one-resistor interfaces to the appropriate ports
> 
> Yes, I've built several of them.  The tricky part, though, is simultaneously 
> interfacing a paddle to send fills.
> 
> 73, Jim K9YC
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