NMAC OCCURS WITH OPPOSITE DIRECTION LNDG TFC AT MGJ WHEN RADIO COM FAILURE GOES UNRECOGNIZED UNTIL LATE IN THE APCH.

Narrative

TRAINING FLT IN A C182; PRACTICE INST APCH INTO MGJ ILS RWY 3; SELF-ANNOUNCED LONG FINAL (ABOUT 10 MI OUT AND EACH 3 MI AFTER THAT; INCLUDING SHORT FINAL; 1/2 MI). COMING IN 3 MI FINAL; ALL WAS QUIET ON THE FREQ FOR MGJ. UPON REACHING SHORT FINAL; I (AS THE CFI) NOTICED NUMEROUS ACFT ON BASE TO FINAL FOR RWY 21! I QUICKLY REALIZED OUR RADIO WAS NOT RECEIVING AFTER OUR SELF-ANNOUNCE TO NOTIFY OPPOSITE LNDG ACFT. I TAPPED THE RADIO WHICH JOLTED A CONNECTION INSIDE AND ALL COMS WERE NOW BEING RECEIVED. AS I WAS CONFUSED STILL; I ADVISED THE STUDENT (A PVT PLT) TO EXECUTE A GAR. I HAD COMMUNICATED WITH THE CHEROKEE ON THE OPPOSITE END LNDG RWY 21; WHY THEY HAD NOT DIVERTED. I WAS ADVISED THAT 'THEY DID NOT CARE ABOUT OUR APCH AND THEY WERE LNDG RWY 21 TODAY; NOT RWY 3.' IT WAS OBVIOUS FROM THIS XMISSION THAT THE CHEROKEE WAS ANNOUNCING THEIR INTENTIONS BUT REGARDLESS OF OUR OBVIOUS HANDICAP OF NOT RECEIVING (NOR RESPONDING TO MY INTENTIONS) XMISSIONS; THE OTHER PLT WAS STUBBORN; RECKLESS AND NOT THINKING AS TO WHY I WAS CONTINUING OUR APCH ON RWY 3. AT THIS POINT; I DID SAY TO THE PLT HIS ACTION WAS VERY STUPID (VERBATIM). THE CHEROKEE PLT THEN ADVISED HE WAS AN FAA SAFETY COUNSELOR! THEN HE CONTINUED TO DO A TOUCH-AND-GO WHILE I WAS IN THE GAR OVER THE RWY AND CAME WITHIN 50 FT OF OUR C182! I BECAME INFURIATED; ADVISED THE OTHER PLT TO READ THE AIM IN THIS SITUATION; AND THEN ADVISED I WAS DEPARTING THE AREA.