Radio Mods Database

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                                                          TM-221A

The TM-221A is capable of receiving from 138 to 174 MHz. With the mod
below, the rig will transmit from 142 to 151.995 MHz.

1.- Remove both the top and bottom cover. Disassemble the front
panel such that the foil side of control unit (X53-3040-XX)
is accessible.

2.- Locate R25 at the bottom left corner of the control unit.
Remove R25. You may just want to cut the trace on the left
side of R25.

3.- Reassemble the unit. Perform a microprocessor reset.

I would like to extend transmit to at least 154.995 MHz. I removed R22
with some interesting results. First the frequency step changed to
12.5 Hz. Second the "ON AIR" indicator came on with PTT depression;
however, my watt meter indicated no power on any frequency (including
2 meters). Any help would be appreciated.




                             


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