Posted by
Don Wilhelm-4 on
Mar 12, 2012; 5:54pm
URL: http://elecraft.85.s1.nabble.com/KX3-CW-from-computer-tp7365321p7366241.html
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<
[hidden email]> 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.
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