The handy in the picture its a Tti-122, also known as FLYTALK LOOK.The schematic in my web page ive got from inet, sorry i dont remeber where, it seems to be valid for Twin Talker 3000 as stated in the schematic but also works the same way with my FLYTALK LOOK (Tti-122)
About my PMR im sorry but i dont know any mods, in the other hand, im happy with it as it is and my goal is to
obtain maximun distance with the original power but increasing antenna performance. Its so easy to home-make an antenna for 446Mhz!