Erik,

Use the RS-232 interface, but you will need the KXSER cable to connect the KX3/2 to the DB9 connector. You can order it from Elecraft or construct your own. If you do not have the parts on hand but still want to build it, order the kit of parts W1SERKT from Elecraft.


I am certain the schematic appears in other places, but one I know about is on page 30 of the XG3 Owner's Manual - download it from the Elecraft website.

73,
Don W3FPR

On 8/5/2017 2:11 PM, Erik Tkal wrote:
The Rigblaster Advantage has both 3.5mm TTL CI-V/CAT and DB9 RS-232 interfaces, 
but it’s not clear which would be best to connect to the KX3/KX2.

Googling found old posts that the KX3 ACC1 is flexible enough to handle either, 
so easiest would be a 3.5mm stereo mini cable, but does it have to be straight 
through or crossover?  If I use 3.5mm to DB9 would it be direct connection or 
is a special level converter cable needed?  I have many USB-serial cables for 
my KX3/PX3/KXPA100/KX2, never thought to specify the DB9 version for any of 
them just to have one handy… :-/


   Thanks and 73,
   Erik Tkal  -  W1QED



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