[Elecraft] Fw: HRD for rig control

[K8TB]

If you are using a RemoteRIg type of remote control, you may have a 
problem in turning the K3 on by remote control if there is a power 
failure at the remote site. At my site, I have a multi channel remote 
control that connects to the ACC pin 8, so I can turn it on from anywhere.

    However, I have another site that I am looking at putting a K3 at (I 
haven't run out of excuses yet!)  At that site, I am going to have a 
simple SPDT 12 vdc relay, with the coil connected to the accessory 12 
vdc jack on the back of the K3. This is powered by the K3 on/off 
circuit. Then tie the comman contact of this relay to your incoming PTT 
control lead (coming from the RemoteRig box if you would). Tie the 
normally closed contact to the pin 8 of the ACC jack. Tie the normally 
open contact to your K3 PTT lead. Now, if the K3 is off, the relay is 
relaxed, and when you key your local mic at home, the PTT signal will 
trigger the K3 on circuit. The relay pulls in, and the PTT lead now 
controls the K3.

     tom k8tb


On 1/17/2012 4:26 PM, Don Wilhelm wrote:
> Miguel,
>
> The K3 can be powered off by software command - send it PS0; to turn
> off.  The K3 cannot respond to commands while it is powered off, but you
> can pull the Remote Power On pin to ground by some other external device
> (ACC pin 8) then the K3 will turn on.
> If the software you are using implements the PS0; command, you can turn
> the K3 power off. I do not know if HRD implements that command or not.
>
> 73,
> Don W3FPR
>