[Elecraft] KX3 CW from computer

[Don Wilhelm]

I do not believe there is a need for 2 com ports.
Most logging applications only handle 1 port.  They use TXD and RXD for 
rig control and do keying and PTT with RTS and/or DTR in the same port.
All you need in addition to the KX3SER cable is to make two of the "one 
transistor keying circuit" to convert the RS-232 levels to TTL - connect 
one circuit to the RTS pin, the other to DTR (in the same KX3SER 
cable).  on the KX3 side of the 2 circuits, one connects to the hand key 
input and the other connects to  PTT.

Actually, you will probably want to make your own KX3SER cable because 
the production cables will have a molded backshell according to a post 
by Eric last week - but making your own should not be difficult at all, 
a male DE-9 connector, a backshell, a 3.5mm stereo plug and some wire - 
add 2 transistors for the one transistor keying circuits and you are done.

73,
Don W3FPR

On 3/12/2012 12:51 PM, Tony Estep wrote:
> On Mon, Mar 12, 2012 at 11:18 AM, KU7Y<ku7y.cw at gmail.com>  wrote:
>> ...I changed over to using a USB WinKeyer...
> ========
>   I can set up my software to use 2 Com ports, one for
> rig control and one for keying, and have a second gadget attached to
> the computer to key the radio.