[Elecraft] KPA100 Amplifier Keying

[Don Wilhelm]

Bob,

Is one K2 set for 8R HOLD and the other 8R Normal?
You should have them both set for 8R HOLD to get the amp keying circuit 
to hold in during keying.

You might also look for a sneak ground path between the K2/100 and the 
amplifier.  Your ohmmeter says the AMP should stay keyed, but it 
actually does not - so the answer may be in the return path for the 
amplifier relay - be certain the amp ground for the relay is carried 
back to the RCA jack on the K2/100 - and be certain that the RCA jack on 
your KPA100 has its shield contact well soldered to the KPA100 ground.

73,
Don W3FPR

Bob Evans wrote:
> I've just installed the KPA100UPKT to bring #4687 up to date.  Apparently, I
> messed up the amp keying circuit somehow.  It now keys and unkeys with each
> dot and dash.  Changing the TR time has no effect on the amp keying.  Even
> when I set the TR to 1 second, the rig holds in transmit, but the amp unkeys
> between elements.  I plug the amp into my other K2/100, and things work
> perfectly, so I know it isn't the amp.  I've put an ohm meter on the amp key
> line and it shows the keyed line to be performing correctly, i.e. holding
> zero ohms until the TR releases.
>
>