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This modification for the MH-31 mic (FT-817, FT-897, FT-857 etc.) gives you a little more talkpower and cuts the low-end of the audio spectrum. At 0:16, you can hear how this microphone modification can make a difference under difficult conditions.
It can really make a difference especially on the FT-817 – all you need to do is take out a resistor and replace the elco with a 47nF capacitor.
Description of the mod here: https://hamradiosoul.wordpress.com/2016/04/24/more-talkpower-for-the-ft-817-a-very-simple-microphone-modification/
Original idea by Anton: http://funkperlen.blogspot.de/2015/02/funkperlen-reloaded-yaesu-mikrofon-mh.html
Check out my book “Ham Radio Boost”: https://www.amazon.com/dp/B06WGPX5JR