A BE36 TOOK OFF RWY 32 AFTER HEARING WHAT HE THOUGHT WAS HIS CALL SIGN BEING GIVEN A TKOF CLRNC. AS THE BE36 WAS BECOMING AIRBORNE THE TWR SAID THE CLRNC WAS NOT FOR HIM; BUT WAS FOR A CESSNA ACFT WITH A SIMILAR CALL SIGN. RPTR FEELS THE TWR'S COMMENTS SHOULD HAVE BEEN DELAYED UNTIL HE WAS NOT IN A CRITICAL PHASE OF FLT.

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ON SUNDAY I TAXIED TO THE ACTIVE RWY (RWY 32); ANNOUNCED ON TWR FREQ THAT I WAS READY FOR TKOF: 'BONANZA XYZ #1; W SIDE; READY FOR TKOF.' THE CTLR (FEMALE) CAME ON AND SAID: 'CESSNA XYZ; HOLD SHORT; LNDG TFC.' I RESPONDED: 'I AM A BONANZA XYZ.' THERE WAS NO OTHER AIRPLANE READY FOR TKOF ON THE OTHER SIDE OF THE RWY. SHORTLY AFTER THE PLANE LANDED; THE CTLR CAME ON (MALE): 'XYZ READY FOR IMMEDIATE TKOF?' I REPLIED: 'YES; XYZ.' CTLR: 'XYZ CLRED FOR TKOF; TFC 1 MI FINAL.' I REPLIED: 'CLRED FOR TKOF REQUESTING L DOWNWIND DEP; XYZ.' HE REPLIED: 'L DOWNWIND APPROVED; START YOUR ROLL.' I SAID: 'XYZ.' WHILE BECOMING AIRBORNE; THE CTLR CAME ON AND SAID: 'XYZ THE TKOF CLRNC WAS NOT FOR YOU; IT WAS FOR A CESSNA WITH A SIMILAR CALL SIGN; I WILL NOT PURSUE IT THIS TIME BUT YOU SHOULD PAY CLOSER ATTN TO THE CALL SIGN.' I SAID I WAS SORRY; BUT I WAS SURE IT WAS FOR ME. ALL THIS CONVERSATION WHILE I'M IN A CRITICAL FIRST PHASE OF FLT. I KNOW FOR SURE THAT HE MADE AN ERROR AND SOMEHOW HAD TO COVER HIMSELF; BUT BY DOING IT HE ENDANGERED MY PAX AND ME. NO ONE WAS CLRED FOR TKOF AFTER ME UNTIL I WAS BACK BEYOND THE DEP END OF THE RWY (L DOWNWIND DEP).