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Rick, It sounds like the sidetone may be set too low.  If you slide the
KX-155 out of the tray, and look on top of the radio, you will see a hole in
the top cover labeled "Sidetone".  Peel back the tape from the hole, insert
a small (1/8") blade screwdriver, and turn the adjustment pot up.  Reinstall
the radio and test.  You can remove and readjust if necessary.

David Buckwalter
Avionics Systems
<http://www.avionikits.com>

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