home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Media Share 9
/
MEDIASHARE_09.ISO
/
hamradio
/
kenwood1.zip
/
TM321A.MOD
< prev
next >
Wrap
Text File
|
1980-01-01
|
3KB
|
60 lines
TM321A
Date: Mon, 25 Sep 89 14:38:05 EDT
From: rfc@philabs.Philips.Com (Robert Casey)
To: mbramwel@uwo.ca
TM321A Mars/cap mod
from WM8J msgID 2846_wa2rkn
To give the TM321 tx coverage from (142 0r 143, don't remember which) to
151.995 mhz, remove the top cover. Look for a loop of wire comming from the
display area (the board with the CPU) and going right back. Cutting this wire
and then doing a CPU reset is all you need to do. Takes about 2 minutes.
Be sure that the ends of the wire don't short to something.
73s
Note: I haven't tried this, proceed at your own risk! WA2ISE
TM321A.1
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.
1951z, 473 msgs, #1786 last @KD6TH-4 MailBox>
TM321A.2
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.