TH205 144 - 165 TX/RX MOD TO OPEN YOUR TH-205,215,OR 225 ALL YOU HAVE TO DO IS TAKE OUT THE SCREWS ON THE BACK, AND GENTLY OPEN UP THE FRONT OF THE UNIT...LOCATE THE OBVIOUS 4 JUMPER BRIDGES ON THE PC BOARD. THE BRIDGES ARE NUMBERED J-1, J-2, J-3, AND J-4..JUMPER J-3 HAS ALREADY BEEN CUT...CAREFULLY SNIP JUMPERS J-1 AND J-2 AND EVER SO SLIGHTLY SEPERATE THE SNIPPED BRIDGES TO INSURE NO-CONTACT BETWEN THE POINTS.. REASSEMBLE THE UNIT..LOOK AT YOUR INSTRUCTION MANUAL AND RESET THE MICROPROCESSOR..THE MOD WILL NOT WORK UNTIL YOU RESET THE MPU... THE INFO. FOR RESET IS NEAR THE BACK OF THE MANUAL..AFTER THAT THE UNIT IS WIDE OPEN TO OPERATE BETWEEN 144 TO 165...GOOD LUCK ..BILL N6WPG