I have aquired a M-33A/AIC microphone which I would like to use with my flight helmet. The M-33A is a dynamic microphone and I believe it has an impedance of 3 ohms. What do I need to do in order to use this microphone with a civilian radio? Perhaps it would be cheaper to purchase a different mic. I have tried using an impedance adapter for going from a military helmet to a civilian radio and this resulted in a squeal but no voice.