[Elecraft] Remote On/Off KPA-1500

[Bob Wilson, N6TV]

On Mon, Mar 18, 2019 at 7:39 PM Jorge Diez - CX6VM <cx6vm.jorge at gmail.com>
wrote:

> what are the diferent ways to turn KPA1500´s on/off remotely?
>
> Is there any way to turn it on/off alone, with no need to turn on/off the
> K3?
>

Yes.  There are at least three methods to power the KPA1500 ON/OF
independently without using the REM jack on the back of KPA1500, assuming
you leave the rocker switch on the back of the separate KPA1500 power
supply in the ON position:

   1. Connect the KPA1500 to a PC via USB cable.  Use the KPA1500 Utility
   (running on a local PC) to power the amp. on and off.  The KPA1500
   Remote Software
   <https://elecraft.com/pages/kpa1500-kpa500-kat500-remote-software> also
   has this capability.
   -or-
   2. Momentarily ground Pin 8 of the KPA1500 AUX connector.  This is
   easily accomplished using an S-BOX <https://bit.ly/S-BOX> or S-BOX-USB
   and a simple program to pulse the DTR or RTS pin of a real or virtual
   serial port, or you can build an equivalent circuit using a resistor and
   NPN transistor (same technique that is used by RemoteHams software to power
   up a K3 remotely with no RemoteRig box required).  A KPAK3AUX cable cannot
   be used (no connection on Pin 8).
   3. Use a Y-BOX v2.1 <https://bit.ly/Y-BOX> which can connect DIGOUT 1
   (Pin 11) to the amplifier PIn 8, and a K3 Macro, as described in detail
   here <https://www.kkn.net/~n6tv/Y-BOX/Features.html#Remote>.

For example i want to turn on K3, but want to have KPA1500 off, is there
> any way to do that?
>

Yes.  See above.

73,
Bob, N6TV