AN MD11 HAS RADIO AND ACARS XMISSION PROBS AND IS UNABLE TO ESTABLISH RADIO CONTACT; COM AIR-TO-GND.

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AT 150 NM FROM LNDG AT OUR DST (IND); I; THE FO; SUCCESSFULLY CONTACTED OUR COMPANY FOR AN IN-RANGE CALL. THIS WAS OUR LAST VHF XMISSION. WE WERE UNABLE TO XMIT ON ANY VHF COM OR ACARS. VHF RECEPTION ALWAYS REMAINED GOOD. WE SQUAWKED YYYY ON THE XPONDER. ZAU INSTRUCTED US TO 'STOP THE IDENT.' WE RETURNED TO OUR PREVIOUS CODE XXXX. WE WERE GIVEN VECTORS AND DSCNT INSTRUCTIONS FOR AN ARR INTO IND FOR RWY 5R ILS. THE LNDG WAS UNEVENTFUL. UPON SHUTDOWN AT OUR GATE; WE WERE MET BY THE FIRE DEPT WHO INQUIRED ABOUT OUR HIJACK. THERE NEVER WAS A HIJACK. WE SUSPECT THAT USING XPONDER CODES 'NEAR' 7500 INCORRECTLY ALERTED ATC. I SUSPECT THE SOURCE OF THIS VHF PROB TO BE THE FO YOKE XMIT SWITCH. AFTER THE LAST SUCCESSFUL XMIT; THE SWITCH FELT STICKY. PERHAPS IT STILL WAS MAKING SOME SORT OF CONTACT. THE CREW WORKED WELL TOGETHER WITH COM TO EACH OTHER. NEXT TIME I WILL WRITE DOWN ALL XPONDER CODES GIVEN TO US BY ATC DURING FLT; IN CASE WE HAVE TO SQUAWK A TEMPORARY CODE BEFORE RETURNING TO OUR DISCRETE CODE.