[Elecraft] K3 & 2 x Amplifiers

[Michael Eberle]

Hi Mike,

I'm not sure if the Key Out and key line on the Aux port are isolated or 
not.  At one time I had the KPA500, a tube amp, and a 2M amp for the 
internal transverter all connected.  I used a KRC2 band decoder 
connected to a couple of relays that would switch the Key Out signal 
among the three depending on what band I am on.  It requires some extra 
cabling because it needs to also needs to connect to the AUX port as 
well as the KPA500/KAT500.

With only 2 amps, you may be able to use a relay to switch the Key Out 
signal controlled by the DIGOUT 1 pin on the Aux connector. You would 
have to set DIGOUT 1 in the K3 config menu to 'OFF' on every band except 
for 6M where it would be set to ON.  You would have to make sure to use 
a relay small enough that it doesn't pull more current than the DIGOUT 1 
pin can handle though.

73
Mike - KI0HA

On 8/15/2015 5:20 PM, Mike VE3YF wrote:
> Hi:
>
> I would like to know if it is possible to hook up the KPA500 to the 
> Antenna Port 2, use the KPAK3AUX cable and splitter cable from the K3 
> to KPA500,
> and then other half of the splitter cable to the MK2R+. When in normal 
> use the I would use Antenna Port #1, and when I want to work 6m or the 
> KPA500
> amp use Antenna Port #2.
>
> I guess a question comes to mind, is the key out jack isolated from 
> the keying line on the KPAK3AUX cable. I see that is being the major 
> issue, but I am
> sure I am not the first one to think of this possible setup. I welcome 
> any comments etc. Tnx
>
>
> 73 De Mike
> VE3YF