[Elecraft] K3 - Key Out Question

[Jack Nelson]

Good evening. I'm attempting to use my K3 with a Tokyo High Power HL-1.2Kfx 
amp. On the amp, when STBY (which has 12v on it) is grounded, the relay 
clicks, and the "On Air" led lights....just like it should. However, when a 
cable is connected between the K3's Key Out jack, and the STBY on the amp, 
the amp shuts down with an "Over Drive" warning as soon as the K3 is keyed. 
The K3's power is passed through the amp to the watt meter and dummy load.

I noticed the Key Out jack on the K3 has 4.75vdc on it whether it's in the 
Tune position or not. Is this normal. I don't think the amp likes seeing the 
voltage from the K3.

73's Jack  K5FSE
Treas  QRP ARCI

jack.nelson at mindspring.com