Subject: TM321a weak mic audio fix
Message-ID: <62440
From: rfc
Date: 28 Aug 89 15:03:59 GMT
Reply-To: WM8J
Msg# TSP Size #Rd Date/Time MsgID From To
1740 BF 824 0 0827/0533 4206_WA2SNA WM8J ALL
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.
1951z, 473 msgs, #1786 last
SOURCE: The QRZ Windows Ham Radio CDROM |
