Subject: TM321a weak mic audio fix
Message-ID: <62440@philabs.Philips.Com>
From: rfc@briar.philips.com (Robert Casey;6282;3.57;$0201)
Date: 28 Aug 89 15:03:59 GMT
Reply-To: WM8J@WA2SNA

 Msg# TSP  Size #Rd Date/Time MsgID        From   To
  1740 BF    824   0 0827/0533 4206_WA2SNA  WM8J   ALL@ALLBBS
   Sb: TM231/WEAK MIC AUDIO FIX

A QUICK AND DIRTY FIX FOR THE KNWD TM231A LOW MIC OUTPUT:  KNWD
COMES  OUT WITH A FIX WHICH IS TO BYPASS R 63 (3.3K). R 63 AND R64 FORM A
VOLTAGE DIVIDER AT THE INPUT TO THE MIC AMP. R63 IS ON THE BOTTOM OF
THE RIG. WITH THE BOTTOM COVER OFF AND THE FRONT OF THE RIG FACING YOU,
LOCATE THE MIC AMP BOARD 3610    WHICH STANDS VERTICALLY OFF THE
MOTHER BOARD. FOLLOW THE 3RD PIN FROM THE LEFT  TO R63. A JUMPER HERE
GIVES THE TX AUDIO A NICE BOOST.  BE SURE TO READJUST THE DTMF OUTPUT
IN THE MIC (THE ONLY POT IN THE MIC).  73 AND GOOD LUCK. GREG.

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