You could build a relay box, fed from the Aux out and feed the PR6 & the P3 
from that, the power for the relay box would need to come from the same PSU 
that is powering the K3 or a different PSU - but turning the K3 on would power 
up the other units
73 de David, M0XDF
-- 
It is unwise to be too sure of one's own wisdom. It is healthy to be
reminded that the strongest might weaken and the wisest might err.
-Mohandas K. Gandhi (1869-1948)

On 17 Aug 2013, at 22:28, John wrote:

> I am using PR6 with my K3 and power for it is supplied via the RCA 12 VDC out 
> on the back of the K3.
> Where may I supply the P3 power from the K3?  Do I need another power supply 
> for the P3?
> Thanks 
> John.
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