The model 318 Amplifier Keying Interface provides an excellent means of keying a non-QSK amplifier from a full QSK transceiver. The Amp Key Interface allows for either closure to ground or positive key voltage during transmit. Four controls/indicators are found on the front panel.
The 318 Interface was designed for direct connection to a TEN-TEC Eagle transceiver.
Here is a brief description of what the 318 can do for you:
Posted by Ai4CO, Randy Moore on 2nd Jul 2012
I really wanted to be able to have my TT-712 audio interface and my amplifier connected at the same time. I was planning to make a interface of my own that would expand the interface capabilities of the Eagle when I discovered the solution. The TenTec 318 Keying Interface. It plugs right into the DIN connector on the back of my Eagle. My amplifier, model 712 audio interface, and a remote key can all be connected at the same time. The 318 is a great interface that expands the capabilities of my 599AT Eagle and well worth the $89.00.