[Elecraft] K3 not keying PW-1 amp

[John Gaynard]

I finally unboxed my PW-1, after it's repair by ICOM, and plugged in the K3.
I connected the KEY-OUT to the SEND2 connection on my PW-1, connected the K3
to INPUT2, set the power down to 25w, powered up the ICOM PW-1, pushed in
AMP/PROTECT so it was GREEN,  the K3 is in CW VOX mode, keyed the K3, and
the PW-1 only reflected 25w output.  The PW-1 TRANSMIT light never lit up
which says I'm not keying the PW-1.  I have the K3 PW-1 negative ALC mod
installed, but did not connect it up to the PW-1.  I ran the PW-1 with the
K3 from last December, through June of this year, configured this same way
with no problems, 25w of drive will output around 1100w on 40m CW.  I don't
need the ALC mod but it is a nice safety net if I actually connect up the
ALC connection on the PW-1.  Last year, I had the ICOM756ProIII connected to
input 1and the ACC1 interface to the PW-1 was connected, which basically
supplies power to the PW-1 antenna switch when the amp is in the off
position.  The PW-1 Is in the INPUT1&2 position.  Does it make a difference
that there is no transceiver connected to INPUT1 and ACC1.  That is the only
real difference.  I know that there are a few (more than a few) K3 owners
with PW-1 amps.  I am probably doing something wrong but it sure isn't
obvious to me.  My firmware level is 2.38 on the K3.  I guess I could try
plugging into the Input 1, send 1 inputs on the PW-1 to see if that makes
any difference.  The PW-1 manual does not indicate that a transceiver has to
be connected to the input1 connections on the PW-1.

 

John K8WDN

K3 #157

 

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