C210 COURIER PLT HAS STUCK MIKE AND UNABLE TO COM ON IFR FLT IN VFR CONDITIONS. PLY CONTINUES FLT BUT ENTERS CLASS B AIRSPACE AT CVG ARPT. PLT ENTERS NORMAL PATTERN WITH ALL LIGHTS ON AND LWOC.

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ON FEB/TUE/01; I HAD A LOST COM SIT DEVELOP ON THE FINAL LEG OF A 6 LEG CARGO MISSION UNDER PART 135 RULES. ACTUALLY; I HAD A 'HOT MIKE' THAT I COULD NOT GET RID OF OR REALLY KNOW WHAT TO DO WITH. I WAS IFR IN VMC. MY CHARTS WERE ALL CURRENT. I HAD NOT LOOKED AT A VFR CHART FOR A LONG TIME. I KNEW I SHOULD HAVE JUST LANDED AS SOON AS PRACTICABLE; BUT I REALLY DIDN'T KNOW WHERE THE NEAREST ARPT WAS. I HAD A LOAD OF FINANCIAL DOCUMENTS THAT REALLY SEEMED TO NEED TO GO TO LUK AND I WAS ALMOST THERE. I THOUGHT THAT THE CARGO WAS SO IMPORTANT AND IT NEEDED TO GET TO THE DEST SO BAD THAT I JUSTIFIED DEVIATING FROM REGS TO GET THE WORK IN ON TIME AT THE RIGHT PLACE. I FOLLOWED MY LAST VERBAL CLRNC AS I TRIED TO GET MY MIKE UNSTUCK. AS FAR AS ALT; I SORT OF MADE IT UP AS I WENT ALONG AND ENDED UP SOMEWHAT DUPLICATING WHAT I USUALLY GET ON A TYPICAL VISUAL APCH ON IFR RULES INTO LUK. THIS HAPPENED ON MY SCHEDULE IN WHICH I FLY 6 LEGS IN ABOUT 7 HRS OF FLT AND 12 HRS OF DUTY TIME. IT IS SINGLE PLT IFR IN A C210. I TRY TO FLY IT LIKE IT IS A HVY JUMBO JET AND I OFTEN MODEL MY RADIO PHRASEOLOGY AFTER THE JUMBO JET PLTS. WHAT REALLY CAUSED THIS OCCURRENCE (I BELIEVE) WAS A COM RADIO MALFUNCTION. IF I COULD HAVE HANDLED THE SIT AND EVENTS AFTER THE RADIO MALFUNCTIONED BETTER; I WOULD HAVE. I DIDN'T THINK TO SQUAWK LOST COM FOR QUITE A WHILE AFTER THE PROB WAS DETECTED AND THEN I COULD NOT REMEMBER IF 7600 WAS LOST COM OR 6500 WAS LOST COM. AND I DECIDED THAT KEEPING MY IFR ASSIGNED SQUAWK CODE WAS BETTER THAN ANYTHING ELSE AT THE TIME. I FLEW DIRECT CVG VOR TOWARD THE DEST ARPT FOR A LONG TIME AND SORT OF HAD IT BACKED UP WITH MY YOLK MOUNTED GPS UNIT. THE LAST ASSIGNED RTE WAS 'DIRECT' CVG VOR THEN 'DIRECT' LUNKEN AND THAT IS WHAT I WAS DOING; BUT I GOT A LITTLE BIT CONFUSED AS FAR AS HOW CLOSE I WAS. I THOUGHT I WAS 15 MI OUT THEN 35 MI OUT USING GPS AND DME. ONE PROB WAS I TURNED COM OFF FOR A MOMENT AND IT TURNED NAV OFF. I GOT AN ARPT IN SIGHT AND THOUGHT THAT THAT WOULD DO; AND THEN I REALIZED IT WAS COVINGTON INTL. MOMENTS LATER; I FOUND COVINGTON. I SPOTTED LUK IN DISTANCE UNDER SOME CLOUDS; AND I WAS UNSURE IF I COULD GET IN TO LUK WITHOUT GOING IMC. THEN I REALIZED FROM CURRENT POS TO LUK I WOULD HAVE TO CROSS FINAL APCH COURSE (CVG) AT FINAL APCH ALT. AND REALIZING I WAS NOW RIGHT NEXT TO COVINGTON AND PROBABLY IN EVERYBODY'S WAY; I JUST DECIDED TO GO IN AND LAND ON NEAREST; MOST OUT OF THE WAY RWY. I TURNED ON LNDG LIGHT AND NAV LIGHTS IN ADDITION TO STROBE AND BEACON THAT WERE ALREADY ON. ON FINAL; I SAW AN AIRLINER THAT WAS LINED UP WITH RWY AND ALMOST IMMEDIATELY REALIZED THAT IT WAS GOING AWAY FROM ME ON A DEP. THIS WAS A RELIEF; BECAUSE I KNEW I WAS AT LEAST SOMEWHAT GOING THE RIGHT WAY. I DIPPED AND ROCKED WINGS AND PITCHED NOSE UP AND DOWN ON FINAL ALL WHILE KEEPING A NORMAL GS AND NORMAL SPD INTO RWY AND ROLLED OFF RWY AS SOON AS I SAFELY COULD AND SHUT DOWN ON A TXWY. I WAS ESCORTED INTO FBO AND MET MY COURIER THERE AND LEFT THE PLANE ON THE RAMP FOR REPAIR TO BE MADE BY MY COMPANY. I RODE BACK TO LUK (DEST ARPT) WITH THE COURIER AND THE LOAD. WHEN I WAS SITTING IN THE NICE OFFICE AT FBO WATCHING THE AIRLINES TAKE OFF AND LAND; I THOUGHT TO MYSELF THAT I WOULD RATHER BE HERE THAN AT SOME 'PODUNK' LITTLE DIRT FIELD IN THE MIDDLE OF NOWHERE. I THINK I AM A BETTER PLT AND A BETTER PERSON AFTER THIS EXPERIENCE.