C182 HAS LOST COM HOLDING SHORT FOR TKOF; VISUALLY CLRS APCH TO RWY; HAS A RWY INCURSION BY XING RWY TO CLR THE TXWY BEHIND HIM AND RE-ESTABLISHES COM.

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I WAS READY TO DEPART MOB ON AN IMC FLT PLAN. AFTER RUN-UP AT THE ACTIVE RWY THRESHOLD; I EXPERIENCED A PARTIAL COMS FAILURE. I COULD RECEIVE; BUT COULD NOT XMIT. AFTER REPEATED ATTEMPTS TO REACH BOTH MOB GND AND TWR; I BEGAN TO TROUBLESHOOT MY EQUIP TO RE-ESTABLISH 2-WAY COMS. DURING THIS TIME; 2 COMMERCIAL ACFT ARRIVED AND WERE THUS BLOCKED BEHIND ME (THERE WAS NO WAY FOR ME TO CLR THE TXWY) AS I TRIED TO CONTACT EITHER/BOTH GND AND TWR STAFF. I THEN BEGAN TO WATCH THE TWR FOR A LIGHT GUN SIGNAL; BUT NONE WAS OFFERED. DURING THIS ENTIRE TIME I WAS MONITORING BOTH GND AND TWR FREQS (THERE ARE 2 RADIOS IN THE ACFT). I DID RECEIVE OCCASIONAL XMISSIONS FROM GND TO RE-ESTABLISH CONTACT; BUT NO INSTRUCTIONS WERE PROVIDED. AFTER SEVERAL MINS OF TRYING TO RE-ESTABLISH 2-WAY COMS; I DECIDED THAT I WOULD NEED ADDITIONAL TIME AND EFFORT TO TRY TO REPAIR MY XMITTER. AS I WAS NOT RECEIVING ANY INSTRUCTIONS FROM EITHER GND OR TWR (AND STILL NO LIGHT GUN SIGNALS); I KNEW THAT I COULD NOT CONTINUE TO HOLD THE COMMERCIAL TFC BEHIND ME ON THE TXWY. AS SUCH; AND CONSTANTLY MONITORING BOTH GND AND TWR COMS; I DECIDED; AS PIC; TO MOVE MY ACFT OUT OF A BLOCKING POS SO OTHER ACFT COULD DEPART. VISIBILITY WAS UNLIMITED AND SKIES WERE CLR BELOW 12000 FT. MONITORING BOTH TWR AND GND; AND VISUALLY MONITORING THE APCH PATH FOR RWY 14; I ELECTED TO PROCEED DIRECTLY CROSS THE RWY TO THE CONTINUATION OF THE TXWY ON WHICH I WAS HOLDING SHORT. THE TIME TO CROSS WAS LESS THAN 10 SECONDS. DURING THIS TIME; THERE WERE NO OTHER ACFT IN THE APCH PATTERN; NOR WERE ANY XMISSIONS RECEIVED FROM ANY ACFT THAT WERE EVEN IN THE VICINITY OF THE ARPT. IMMEDIATELY UPON MY CLRING THE TXWY; BOTH COMMERCIAL FLTS WERE CLRED FOR TKOF. AFTER RE-ESTABLISHING XMITTING CAPABILITIES; I CONTACTED GND WHO ADVISED ME TO CALL THE LCL TRACON. I PROVIDED MY CONTACT INFO; AND WAS THEN CLRED FOR DEP. I COMPLETED THE TRIP UNDER THE IFR FLT PLAN WITH NO FURTHER COMS PROBS. IN HINDSIGHT; THERE WERE SEVERAL THINGS THAT I COULD HAVE ATTEMPTED TO POTENTIALLY AVOID XING THE ACTIVE RWY WITHOUT CLRNC: 1) TAXI OFF THE PAVED SURFACE TO ALLOW THE OTHER FLTS TO LEAVE. 2) CONTINUE TO WAIT UNTIL RECEIVING GND OR TWR INSTRUCTIONS; LEAVING THE COMMERCIAL FLTS STRANDED BEHIND ME. 3) CONTINUE TROUBLESHOOTING; BUT THIS WOULD PREVENT ME FROM POSSIBLY SEEING LIGHT GUN SIGNALS AS MY ATTN WOULD BE DIVIDED BTWN INSIDE AND OUTSIDE THE ACFT. NO INCOMING FLTS WERE AFFECTED; AND NO TFC WAS REQUIRED TO TAKE ANY EVASIVE ACTION OR WAS EVER IN EVEN ANY REMOTE DANGER OF AN NMAC. UPON ARR AT HOME BASE I HAD THE AIRPLANE INSPECTED. THE PROB WAS A SHORT IN THE PUSH-TO-TALK SWITCH. IT HAS BEEN CORRECTED.