to gain a slightly better (louder) TX audio enter the radio’s service menu by holding ANL/NB and SCAN while powering on and toggle to the menu entry FM MOD. Now press PTT and set the value to 511. You may find out that the maximum numeric value is 512, but 512 is the same setting like 0 – so 511 is really the maximum deviation you can adjust the radio to.

to expand the VHF/UHF TX frequency follow the instructions according to the picture by removing 2 diodes