[Elecraft] Collins 30L-1 amp with the K3

I want to use a Collins 30L-1 amp with my K3, when I plug the 30L-1 amp control cable into the K3 KEY OUT jack, the 30L-1 keys. The 30L-1 is keyed by grounding it's key line (pulling -160 DC to ground). The K3 specs says +200 VDC, at 5 amps, I guess the K3 does not like the minus voltage on the

[Elecraft] K3 connector

There is a modular connector on the bottom near the front right corner, what's if for? Butch K0BS __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: