[Elecraft] Turning ON KPA500 with K3?

[Andy Faber]

Chuck, For better or worse, I so far have used just a straight through 
cable, not the Elecraft, modified version.  With this cable, the K3 does 
turn on the KPA500 when the K3 is turned on.  However, while the K3 is on, 
you can't turn off the KPA with the KPA front panel switch, and when you 
turn off the K3, the KPA remains on.  So I'm not sure that is a preferable 
mode of operation.
  73, andy ae6y

--------------------------------------------------
From: "ke9uw" <c-hawley at illinois.edu>
Sent: Sunday, August 28, 2011 2:01 PM
To: <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] Turning ON KPA500 with K3?

> There is a line from the aux cable that will switch on and switch 
> off...with
> a pulse low. But how to make the K3 send the pulse? Pin #8...but it, on 
> the
> K3 aux connector is used to turn on the K3 with a pulse low. I think it, 
> on
> the K3, comes from an output/input line from an open drain fet driven by a
> clock/calendar chip...so...and also I guess somehow from the POWER button 
> on
> the K3 front panel to the MCU.
> AND...I guess if pin #8 were not cut off on the aux 25pin cable Elecraft
> sent, then turning on the K3 would turn on the KPA500...what if they got 
> out
> of sync?...then turning on the K3 would turn off the KPA500...and turning
> off the K3 would turn on the KPA500...hmmm...or is that not a problem?
>
> -----
> Chuck, KE9UW
> --
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