®
           Radio Mods Database

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       Web Server         http://216.102.57.116                                                              Email                   kb2ljj@pacnews.com 
          
                                                KENWOOD TM-421A
                                                 ~~~~~~~~~~~~~~~~~~
                           EXTENDED RF and ALIGNMENT CONTROLS

 1- Remove power and antenna.
2- Remove top and bottom cover.
3- Remove the channel knob.
4- Remove the microphone ring.
5- Remove the volume and squelch knob.
6- Remove the front panel from the unit.
7- Remove the front control unit from the chassis
8- Locate component side of the control unit circuit board.
9- Locate and remove chip resistor R-25 and place it in empty space R-23.
10- Remove R-22.
11- Reassemble the radio.
12- Reset the microprocessor Press and hold [MR] wile turning the power ON

CONTROLS:
~~~~~~~~~~ VR-1 S-Meter
VR-3 Audio ADJ.
VR-4 RF Meter
VR-7 Low power
TC-1 Freq ADJ.

        



                             


All the mods are captured by Packet. 
KB2LJJ    Radio Mods Database 
take now responsibility or liability for any 
damage resulting from this modification.  
                                  
 I have been trying to help our ham radio with the radio modifications and have asked for any type of new radio mods.
 However, I haven't received too many.  If all of you contributed a little more,  I believe I would be able to help 
all the other ham's that are looking for these mods. I know it is possible to get more mods from all the Ham's because of
 the wide range that exist throughout the world.  By doing this we can  flourish and enjoy more of this hobby that 
we've taken part in for so many years. Furthermore, I ask you not to forget to send me any modifications that you might
 have through email.  I would really appreciate it.

      Email                kb2ljj@pacnews.com

 73's
   John Ribeiro
             KB2LJJ