RANGER 2900,SOMMERKAMP TS789DX OR GALAXY URANUS? ALL ARE THE EXACT SAME ,JUST WITH DIFFERENT NAMES. I HAVE ALREADY CONTACTED RANGER & GALAXY THEMSELVES,BUT THEY SAID THAT THEY DONT HAVE ANY INFORMATION ON THESE RADIOS AS THEY ARE OLD,ALSO DOES ANYBODY KNOW IF THERE IS A BATTERY OR SOMETHING INSIDE THIS RADIO TO POWER THE MEMORY FEATURE? AS EVERYTIME I TURN THE POWER SUPPLY OFF IT WIPES OFF ALL THE MEMORIES I HAVE PROGRAMMED INTO IT, I HAVE LOOKED INSIDE THE RADIO, BUT NO SIGN OF A BATTERY.ANY HELP MUCH APPRECIATED,CHEERS

P.S THE I.D PRINTED ON THE MAIN PCB IS EPT630011Z.