In a previous comment, someone said he had ideas of
using a mocrophone from a CB radio on the MBitX.
I do not remember who it was and the comment was in
a post that was addressing another question. While
this may be old news to most here, I found a circuit for
using a dynamic microphone on the MBitX and here
is the website below.
Perhaps this will be useful to someone:
Bob Lunsford