The stock K2 doesn't have a keying line for an amp. Here's an easy way to add 
one (I recently did this so I could use the K2 with the KXPA100 amp):
http://www.mwrs.org.au/2014/04/20/elecraft-k2-amplifier-keying-circuit/

73,
Matt VK2RQ

> On 8 Jun 2014, at 9:24 am, Robert G Strickland <[email protected]> wrote:
> 
> I'm  going to use my K2 for Field Day. In prep, I'm putting the K3 aside and 
> putting the K2 back in the station lineup in order to  re-acquaint myself 
> with the its operation. Looking at the cabling diagrams in the KPA500/KAT500 
> manuals, an RCA jack line from the K2 to the tuner and another RCA jack line 
> from the tuner to the amp looks pretty straight forward. With this setup, do 
> I disconnect the keying/integration cables that normally connect the K3, 
> KPA500 and KAT500? Assuming so, are there any other aspects of using the K2 
> with the other K-Line units to which I should pay attention? Thanks.
> 
> ...robert
> -- 
> Robert G Strickland, PhD ABPH - KE2WY
> [email protected]
> Syracuse, New York, USA
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