Quick Microphone Question

Hi guys i'm designing a wireless underwater system for diver communications, i was just wondering if there was a typical output voltage range from a microphone so that i can smack that into my calculations for my voltage to frequency converter. I'd really appreciate it if someone could get back to me.

Cheers

Stuart

It depends very much what kind of mike it it.

a hydrophone provides about .3 volts max (at the word "FOUR"- "FOUR" has been found to provide the high vibrations at normal voice levels), however, hydrophones are very expensive.