For switching between remote conrol and working in my Shack, I habe built a Switching-Box. There I can switch a Desktop-Mic or a Headset for local work and also, I can switch very easy for the Remote-Control for working from my living-room. In remote, I can switch the local speaker on or off. If you are interested in my Switching-Box, you can see here the Schematic. With this box, I switch some other accessories which are connected with my K3. Here you can see the Block Diagram of my remote station.
If you rebuild this box, only at your own risk.
Elecraft KPA-500 Elecraft KAT-500
If you rebuild this control-unit, only at your own risk.