Another trick that works:

If you're using a K3 and KPA500, there are only 9 lines needed, and two 
of those are grounds. A CAT5 cable has 8 lines. If you use one line for 
ground and connect it to both ground pins at each end, you have the 
necessary 7 lines left. I used this scheme to build a 15 foot jumper. It 
works perfectly. I discussed this with Eric before I tried it.

73,

Steve
AA4AK


On 10/7/2012 7:44 AM, David Robertson wrote:
> Jim,
> The cable Elecraft sells is of top quality but is only 3 feet long. If that
> length is ok then get it. If you need longer cable you can build it. The
> schematic is in either the KPA500 construction or operation manual ( I
> think it is in the construction manual).
>
> You need 2, 15 pin HD D connectors ( Male type ) and an old parallel
> printer cable or a old RS232 cable with DB 25 connectors at each end. It
> took me about 20 minutes to build mine after rounding up the parts. I made
> mine 5 feet in length which was just right for my station.
>
> 73
>
> Dave KD1NA
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