Modifications for the Kenwood TM-241
TM-241A RX/TX mods
This mod is only intended for experimental applications only! Know what
freq you are on and don't use this mod if you are not for sure.
The TM-421a is capable of transmitting from 136 to 174 MHz when the following
modification is performed. The transmitter specifications will vary from
published in-band specifications.
-
Remove the top and bottom covers from the transciever.
-
Remove the knobs from the front panel.
-
Remove the nut from the mic jack and the nut from the channel selector
switch.
-
Remove the 4 screws that secure the front panel to the body of the
transceiver.
-
Pull the front panel off the transceiver to expose the Control board.
-
Remove the 3 screws from the Control board. Gently pull the board off
the transceiver.
-
Cut the GREEN jumper wire on the Control board.
-
Install an MA141A chip diode or 1N914 diode as D209 on the Control
Board.
-
Reassemble the transceiver by reversing steps 1 - 6.
-
Reset the microprocessor by holding in the MR key as power is turned
on.
+-------------------------------------------------------------------------+
| D209 |
| +-+ +-----+ |
| |ò|- |--|ò+---+ |
| | | |
| | | |
| | | | | |
| | | +-+ |
| +-----------------------+ +-------------------------+ |
| | [] [] [] [] [] [] [] | --+ | [] [] [] [] [] [] [] [] | |
| +-----------------------+ ---+ +-------------------------+ |
| |
| |
+-------------------------------------------------------------------------+
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