C208 PLT AND A PA28 HAD CONFLICT IN THE PATTERN AT 7B2.

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DEPARTED HVN AT XA05 NOV/WED/02 VFR CONTACTED BDL APCH 10 MI N OF HVN CONTINUED FLT FOLLOWING TO 6 MI NE OF BARNES AT 2000 FT. I CALLED 7B2 UNICOM ASKING WHAT THE ACTIVE WAS. WITHIN 10 SECONDS; ACFT CALLED IN RWY 32 AT NORTHAMPTON. I RESPONDED THANKS. CHKED OUT WITH BDL APCH. STARTED DSCNT. CALLED 7 OUT THEN ENTERED ON AND CALLED L BASE. HEARD OTHER ACFT IN THE PATTERN; ASKED HIM TO TELL ME WHERE HE WAS IN THE PATTERN. NO RESPONSE. I TURNED AND CALLED FINAL; ASKED AGAIN. I WAS CALLING ON THE LOST FREQ WITH BDL. I WAS CLRED IN FROM THE RADIO. SAW THE PROB CHANGE THE BUTTON AND IMMEDIATELY CALLED AGAIN. WE CONTACTED EACH OTHER. TOLD HIM I WAS IN THE WRONG; AND ASKED IF HE WANTED TO LAND OR IF I SHOULD GO FIRST. HE TOLD ME TO LAND FIRST. THE OTHER PLANE WENT AROUND. AFTER WE GOT ON THE GND; I WALKED UP TO FBO AND TOLD THEM WHAT HAPPENED AND APOLOGIZED. WHEN THE OTHER PLANE CAME IN; I WENT AND TALKED TO THAT PLT AS WELL. THIS WAS MY FIRST EVENT LIKE THIS; AND IT MADE ME REALIZE HOW IMPORTANT TO BE HEADS UP IN THE PATTERN WITH ACFT WITH DIFFERENT APCH SPDS. BOTH EAST HAMPTON AND NORTH HAMPTON HAVE THE SAME FREQ. CONFUSION STARTS THERE IF PLT ONLY SAYS HAMPTON TFC.