[Elecraft] Using PR6-10 with KPAK3AUX

[Harry Yingst via Elecraft]

I also have the PR6-10, The KPA500, and The KAT500 

Elecraft makes a Y cable but even with that it appears that a line in the KPA500 is pulling the DIGOUT1 Line low so the Pre-amp is always on. 
One possible cure is to get a 15 pin Port-saver and remove the DIGOUT1 pin. Then connect the Port-saver on the end of the end of the cable on the KPA500 side. By doing it this way the pre-amp can be turned on and off but the Inhibit on the KPA500 will no longer work.

What I'm considering is to use the Band3 line on The ACC-line; The Band3 line goes High on 12,10, & 6 and the PR6-10 Range is 22-54 Mhz. Since the logic is inverted (The DIGOUT1  line goes low when on) it can be inverted with a simple 1 transistor stage built into the DB15 hood. Note: I have not tested this but looking at the logic it all looks correct.