SMA PLT; CHKING IN WITH TWR ON L BASE AS INSTRUCTED; IS UNABLE TO ESTABLISH RADIO CONTACT AND GOES AROUND; IN THE WRONG DIRECTION.

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2 ACFT WERE ON A COLLISION COURSE. THE PROBLEM AROSE WHEN 2 ACFT WERE ENTERING BOTH A L AND A R BASE FOR THE SAME RWY AT THE SAME TIME. 8 MI N OF THE ARPT; I CALLED TWR; IDENTING MYSELF AND REQUESTING TO LAND. TWR RESPONDED TO RPT ON A L BASE FOR RWY 14. A SECOND ACFT CALLED TWR; IDENTED ITSELF AND WAS INSTRUCTED TO RPT ON A R BASE FOR RWY 14. UPON ENTERING A L BASE I CALLED TWR TO RPT. THERE WAS NO RESPONSE FROM TWR. THE SECOND ACFT THEN ANNOUNCED HE WAS ON A R BASE FOR 14. I HEARD NO XMISSION FROM TWR. I REPEATED MY CALL TO TWR TWICE MORE. I HEARD THE SECOND ACFT RPT R BASE AGAIN. AGAIN I HEARD NO XMISSION FROM TWR. THE SECOND ACFT WAS NOT VISIBLE TO ME. AT THIS POINT; FEARING WE WERE ON A COLLISION COURSE. I ANNOUNCED TO THE ONCOMING PLANE THAT I WAS DIVERTING TO THE R TO N IN DEFERENCE TO LETTING HIM LAND. AFTER TURNING OUTBOUND FROM RWY 14; THE TWR CALLED AND ASKED WHAT PLANE WAS MAKING; WHAT APPEARED TO HIM TO BE; A 360 DEG TURN OFF RWY 14. I RESPONDED THAT I WAS LEAVING THE PATTERN AND WOULD RETURN SHORTLY. THE TWR THEN CALLED THE SECOND PLANE TO ASK WHERE HE WAS SINCE TWR COULD NOT SEE HIM ON R BASE. THE PLT RESPONDED THAT HE HAD BECOME DISORIENTED AND WAS ON BASE FOR ANOTHER RWY. HAVING MONITORED THE TWR FREQ FOR THE LAST 10 MI AND HAVING HEARD NO OTHER TFC ON THE FREQ; I FELT; IN TAKING DEFENSIVE ACTION; THIS WAS THE SAFEST STEP TO STOP THE CLOSING OF THE GAP BTWN 2 ACFT ON AN APPARENT COLLISION COURSE. TWR DISAGREED AND HAD ME 'CALL TWR AFTER TIE- DOWN.'