The following is a simple modification for the TM-221 rig: 1- Locate the control unit board (X53-3040-XX) located behind the front panel. 2- Right below the channel select rotary switch and opposite the M.IN Sw. you will find R24 and R25.(foil side) 3- Remove R25 for 142.00 thru 151.995 Mhz RX TX 4- Move R25 to space for R24 for 138.00 thru 154.000 Mhz TX RX (Range will vary slightly from set to set) Info provided by N2EYR @ WA2SNA-1 / Eddy Salvador