To: [email protected]
Date: Wed, 8 Nov 89 10:24:00 est
Subject: packet mod for TM321
From: [email protected] (Robert Casey;6282;3.57;$0201)
Date: 5 Sep 89 14:37:21 GMT
Sender: [email protected]

Msg# TSP  Size #Rd Date/Time MsgID        From   To
 2627 BF   1043   2 0904/0022 4650_WA2SNA  WM8J   ALL@ALLBBS
  Sb: TM231PACKETMOD

   THE FOLLOWING IS AN EASY MOD TO SQUELCH THE AUDIO AT MIC PIN 6 FOR
   TNC'S

       WITHOUT TRUE DCD:  OBTAIN FROM KENWOOD A 2SD1757(K) (SURFACE
MOUNT TRANSISTOR).  INSTALL EMITTER TO MIC PIN 8, COLLECTOR TO
MIC PIN 6, AND JUMPER FROM BASE TO THE UNUSED PIN ON CONNECTOR
202. USING THE UNUSED PIN RATHER THAN RUNNING THE JUMPER TO THE
       MOTHER BOARD PRESERVES THE PLUG IN FEATURE OF THE FRONT PANEL.
       CONNECT ONE END OF A 4.7 K RESISTOR (I USED A 6.8 K) TO THE
       MUTE LINE (IC 5 PIN 7), AND CONNECT THE OTHER END TO THE UNUSED
       PIN OF CONNECTOR 4, WHICH MATES WITH CONNECTOR 202.  THIS NEW
       CIRCUIT IS A CLOSE COPY OF THE AF MUTE CIRCUIT THAT SQUELCHES
       THE RX AUDIO AT THE SPEAKER. IT WORKS PERFECT WITH MY PACCOMM
       MICROPOWER 2.  THE HARDEST PART OF THE MOD IS REMOVING THE
       LOCKING RING AROUND THE MIC CONNECTOR. I USED A MODIFIED TABLE
       FORK! GOOD LUCK.

       0241z, 939 msgs, #2643 last @KD6TH-4 MailBox>

Note: I haven't tried this, proceed at your own risk! WA2ISE

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