[Elecraft] K3 interface with N1MM

[Jim Brown]

On Mon, 28 Jul 2008 18:43:02 -0400, Stephen Reichlyn wrote:

>I'd like to interface my K3 to N1MM. Am I assuming correctly that 
>one needs only connect the rig's RS232 port to a serial port
>on the computer to get full radio control AND CW sending? 

For radio control, CW, and PTT, you need a DB9 to DB9 with wires 
connecting pins 2, 3, 4, 5, and 7. Then go into Config and tell the 
K3 to look for CW and PTT on 4 and 7 respectively.

If you have an unusually severe "RF in the shack" problem (for 
example, you're loading a long wire that ends in the shack), you 
should look at the special serial cable wiring in my RFI tutorial. My 
serial cable is home made and uses the four twisted pairs in 
unshielded CAT5 for the connection, with the return conductor of each 
pair going to ground and the hot conductors of each pair going to 2, 
3, 4, and 7, respectively. I also solve the pin 1 problem built into 
most radios and most computers by connecting those return conductors 
to the connector shell, not pin 5. 

http://audiosystemsgroup.com/RFI-Ham.pdf 

73,

Jim Brown K9YC