TW4100A.1

Take the top cover off the rig and locate the row of diodes
in the cutout of the chassis just behind the front panel.
Cut diodes D6 and D8.  This will extend the RX and TX 
from 141.000 to 150.995.
If you come across any modes to take the rig from 138.000 thru
175.000 please let me know.   Thanks.
                                         Vic

Forgot to mention that after you have cut the diodes you need
to reset the microprocessor using porcedures found on page 16 of
the instruction manual.
                                     Vic

The following modification will allow the TW-4100A to transmit on the
VHF band from 141-151 and on the UHF band from 420 to 450 MHz.

1. Disconnect the antenna, mic, and power cord.

2. Remove the top and bottom covers fromm the transceiver by following
   the procedure on page 28 of the Instruction Manual.

3. Locate the row of diodes on the control unit (top front). The
   diodes can be seen by lookng throught the cutout the chassis just
   behind the front pannel.

4. Using a sharp pair of wire cutters, cut diodes D6 (UHF) and D8
   (VHF). Note that diodes D3, 4, 5, and 7 are already removed.

5. Reinstall the top and bottom covers.

6. Reset the microprocessor by turning on while pushing the M button.

Thats it!

73s
Doug