SMA HAS NMAC WITH ACFT ON FINAL AT UNCTLED ARPT.

Narrative

WHILE GIVING RIDES TO RELATIVES; I GAVE THEM TOURS OF THE GRANTS PASS AREA AND STAYED WELL ABOVE AND AWAY FROM THE ATA. THIS ARPT HAS L TFC FOR RWY 30; IN USE THAT DAY. DURING MY STAY I MADE SEVERAL STANDARD L TFC LNDGS WITHOUT INCIDENT. HOWEVER; ON 1 'HOP;' I MADE THE MISTAKE OF DOING A 'STRAIGHT IN;' ANNOUNCING MYSELF ON 122.8; THE LCL CTAF/UNICOM FREQ. ANOTHER PLANE; A HIGH WING; WAS WHERE HE WAS SUPPOSED TO BE; MAKING A STANDARD L HAND APCH. ON FINAL; BECAUSE OF OUR RESPECTIVE WING CONFIGNS; WE WERE NOT VISIBLE TO EACH OTHER. AS A RESULT; I PASSED OVER HIM; HE BROKE OFF HIS APCH; AND WE BOTH LANDED WITHOUT INCIDENT. HE WAS ANNOUNCING HIMSELF ON THE RADIO; BUT; UNKNOWN TO ANYONE; HIS XMITTER WAS NOT WORKING. AFTER WE LANDED; WE DISCUSSED THE CHAIN OF EVENTS AND LEFT EACH OTHER ON GOOD TERMS. HE WENT TO GET HIS RADIO FIXED AND I THOUGHT ABOUT THE ERRORS I MADE. PLEASE SEE BACK PAGE FOR ANALYSIS. I NEVER MADE A NONSTANDARD APCH TO AN UNCTLED ARPT PRIOR TO THIS INCIDENT; AND NEVER WILL AGAIN. THE RECOMMENDED TFC PATTERNS EXIST SO EVERYONE DOES IT THE SAME WAY; REDUCING SURPRISES. THE CHAIN OF EVENTS: MY NONSTANDARD APCH; THE WING CONFIGNS (CLASSIC CASE); THE NONWORKING XMITTER; COULD HAVE ENDED UP ON THE FRONT PAGES OF THE NEWSPAPERS. THANK GOD; THINGS TURNED OUT OK. BECAUSE OF THE BROKEN XMITTER AND THE FACT THAT OUR WINGS WERE BLOCKING EACH OTHER; I WASN'T EVEN AWARE THERE WAS A PROBLEM UNTIL THE OTHER PLT SPOKE TO ME. NEVER MAKE NONSTANDARD APCHS; UNLESS REQUESTED BY ATC; OR IF AN EMER. KEEP YOUR EYES OUTSIDE THE COCKPIT AND TUNE OUT DISTRS; SUCH AS KIDS IN THE REAR SEATS. NEVER ASSUME THE OTHER ACFT HAVE RADIOS OR THAT THEY ARE WORKING. ALTHOUGH I WAS AT FAULT; NEVER ASSUME THE OTHER PLT IS GOING TO FOLLOW THE RULES.