The Yaesu MH-59A8J microphone is an outstanding mobile microphone. 
In my mobile setup, replacing the stock mic with this one has produced many unsolicited comments on 
the high quality of my audio. Additionally, I can control most functions that I need to from the mic 
without having to take my eyes off the road. However, there are some configuring you must do to get the 
radio to use this mic and to make sure the audio is set to the right levels. I am using mine with the 
FT-857D radio, so if you are using a different rig, make sure you check your menu to make sure you get 
the settings correct for your rig. Again, this is a very hot microphone, so make sure you set your ALC, 
AM gain, and FM gain before putting it into service.

 

The steps you need to perform in order are:

    Set menu #59.
    Plug in the mic.
    Configure ALC settings
    Configure FM/AM microphone gain.
    Configure custom buttons.