Subject: KENWOOD TM-211 OUT OF BAND MODIFICATIONS
The following is a simple modification for the TM-221 rig:
1- Locate the control unit board (X53-3040-XX) located behind the
front panel.
2- Right below the channel select rotary switch and opposite the
M.IN Sw. you will find R24 and R25.(foil side)
3- Remove R25 for 142.00 thru 151.995 Mhz RX TX
4- Move R25 to space for R24 for 138.00 thru 154.000 Mhz TX RX
(Range will vary slightly from set to set)
Info provided by N2EYR
EXTENDED RANGE !!
TO GET YOUR 221A TO RECIEVE FROM 138-174 MHZ YOU
NEED TO REMOVE THE FRONT PANEL AND GAIN ACCESS TO THE CHIP RESISTORS
AND REARRANGE THENM AS FOLLOWS:
R22 R23 R24 R25
X O O X X=CONNECTED O=LEFT OUT
IF YOU ARE RUNNING A VK VERSION REMOVAL OF R24 IS ALL THAT IS NEEDED.
THE TX WILL REMAIN AT 144-148MHZ EVEN AFTER THE MOD.
GEOFF VK3KGH
A QUICK AND DIRTY FIX FOR THE KNWD TM231A LOW MIC OUTPUT TILL (IF)
KNWD COMES OUT WITH A FIX 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.
From: N7LMJ
SOURCE: The QRZ Windows Ham Radio CDROM |
