Found this in a radio mod. book a local ham has:

| Just remove the bottom cover (the one where the battery attaches) and cut
the pink wire.  I also taped the ends up to prevent any possibility of a
short.  Reassemble and reset the microprecessor by holding the lamp
button in and turning the radio on.  This will allow extended transmit
coverage.

| It works great!!


| The DJ-180T can be modded for a restricted mode of operation,
| allowing TX on the amateur band as usual, *and* restricting RX to
| the amateur band as well. (The 'stock' configuration has a wider
| receive coverage.)
| 
| Remove the bottom cover plate (where the battery attaches) and
| cut the pink wire. Separate the ends, and put a tiny drop of
| silicon glue there to hold the ends securely but apart from each
| other and anything else. (I don't care for sticky electrical
| tape..)
| 
| Reassemble and set the restricted operation mode by holding the
| Function button in and turning the radio on. The display will
| show all segments. Release the function button after 2 seconds.
| It's the same mod as for expanding the TX coverage, the only
| difference is the button to hold while powering up.