Ok, I\ve promised several of the guys attending Batam party to find the link to where I bought my throat mic.
http://firefoxtechnologies.zoovy.com/pr ... t_Mic.html
Here you go! This worked perfectly with my PA speaker, and I don't even have to use an FX soundboard! The PTT creates a distinct "click" when you push it to talk, and when you release it. Just ask anyone that heard me use it.