I sent uniden an email about the mic pinout so I could use a different mic
Here is the reply I finally got
Our Solution:
Thank you for using our system.
Unfortunately this information is not available as we do not recommend using aftermarket items
Thanks
Sincerely,
WOW, JUST WOW
Page E9 of the manual states the following
Your Bearcat 980 SSB comes with an adapter to connect the radio’s 6-pin microphone jack to an aftermarket 4-pin microphone.
My recommendation is not to by Uniden products if they cannot even support their customers needs