Hi, I have a Ten Tec Centaur 411 HF Linear Amplifier. I will be using a hand trigger to activate the amp. I just need to know please where it should plug into the back of the amp. I'm a little sceptic. The back of the amp is a key in female connector, Key out connector, PTT/Vox female connector, I'm guessing PTT/Vox is where it goes. Please can you gentleman's please assist me. Thank you all and God Bless..