[Elecraft] Connecting a KXUSB to the K2 RS232

[Don Wilhelm]

Hans,

Do not connect a standard serial cable or a USB to serial adapter to the 
K2 AUX IO connector - keep in mind that it is not labeled "RS-232" for a 
reason.

Yes, you can make an adapter to connect the KXUSB to the K2.  A 3.5mm 
jack and a DE9 male connector as well as 3 wires are needed.
Connect the KXUSB tip to the DE9 pin 3, the ring to pin 2 and the Sleeve 
to pin 5.


If you have the QRP K2 and want to really be 'clever', you could mount 
the jack on the rear panel of the QRP top and wire to the back side of 
the DE9 connector pins on the KIO2.  If you have the KPA100, there is no 
room on the rear panel and you will have to build the external adapter.

73,
Don W3FPR

On 8/6/2018 10:35 AM, Hans J Rasmusen via Elecraft wrote:
> All,
> During the past weekend I pulled my faithful K2 out for the EUHFContest.
> I found a RS232 to USB cable locally, but it does not connect. Is there a way I can check if the chip works correctly?
> 
> I have a couple of KXUSB on hand. Is there any reason that I can not or should not connect the KXSUB Tip to Pin 3, the Ring to the Pin 2 and the Sleeve to Pin 5 of the DB9F connector (from the K2)?
> I should then be able to key and control the K2 from N1MM logger, as I do my KX3.
> 
> By the way, the K2 CW sound beats all, my KX3 included.
>