I have one too. I adjusted the pot on the motherboard and still got poor
audio reports. I kept asking and finally got what I hope is a better
understanding of what it sounds like.

Richard in Boston, MA, USA
N1JDU

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Seriously Richard my 252 sounds great !!!!
I've listened to it myself.
The key for me was to get the pot up, hold mike 3.5'' away at a 45deg.angle and
to remember the element is near the top of the mike. The tough part is getting
used to talking on each radio a little differently. A ht with a good pair of
hi-fi cans monitoring the input or
simplex is a great tool in getting this one down. Many schematics for simple,
easy to build deviation meters are to be had on the web.
KC*VIF
Greg Z
to thine own sound be true