PVT PLT MADE TKOF IN FRONT OF ANOTHER ACFT ON SHORT FINAL AT AN UNCTLED ARPT.

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READY TO DEPART FFT ON IFR FLT PLAN AT 45 LCL WITH 50 CLRNC VOID TIME FROM LEX APCH CTL. HAD COMPLETED ENG RUN- UP; NAV AIDS TUNED WITH 1 COM RADIO ON LEX APCH CTL AND OTHER ON FFT (CAPITAL CITY'S) UNICOM -- ALL SET TO GO WITH 2 ACFT IN FRONT AND OTHERS ON BASE AND DOWNWIND. THINGS GOT A BIT TIGHT AND I BEGAN TO WONDER IF I WOULD MAKE MY DEP TIME. BOTH ACFT IN FRONT HAD DEPARTED WITH AN INTERVENING LNDG. WHEN I WAS #1; I ASKED ACFT ON DOWNWIND TO EXTEND HIS BASE SO I COULD MAKE MY TIME. I DIDN'T EXPECT AN ANSWER BECAUSE THERE WAS A LOT OF RADIO TFC. AS A LNDG ACFT PASSED IN FRONT OF ME; I TOOK A QUICK LOOK; SAW NO ONE AND ANNOUNCED 'TAXIING INTO POS AND HOLDING FOR ROLLOUT TRAFFIC' (ACTUALLY HE WAS TOUCH AND GO). AS HE BROKE GND; I ADVANCED THE THROTTLE AND HEARD AN ANGUISHED VOICE SAYING SOMETHING ABOUT BEING ON 1/2 MI FINAL; OR SHORT FINAL. I WAS COMMITTED TO THE TKOF AT THAT POINT. AFTER I HAD BROKEN GND I APOLOGIZED TO THE ACFT BEHIND AND REMARKED THAT I THOUGHT HE HAD HEARD MY REQUEST TO EXTEND HIS BASE. THE RESPONSE -- 'SOMEONE CALL LEX APCH CTL?þ I HAD FORGOTTEN TO TURN OFF THE OTHER RECEIVER AND SWITCH XMITTERS!! ALL MY PREVIOUS XMISSIONS HAD GONE TO LEX APCH CTL!! IT'S A GREAT CONVENIENCE TO HAVE 2 RADIO XMITTERS; BUT I ALLOWED THE ANXIETY OF MAKING A 'CLRNC VOID TIME' CUT ME OUT OF A HABIT DEVELOPED LONG AGO TO KEEP ONLY 1 (RADIO XMITTER) ON AT A TIME TO PRECLUDE WHAT HAD JUST HAPPENED FROM HAPPENING. THE HABIT WAS/IS GOOD IF I CAN JUST KEEP TO IT!