GA SMA AT NON TWR ARPT ENTERED RWY RESULTING IN ATX SMA ON SHORT APCH HAVING TO EXECUTE GO AROUND.

Narrative

TAXIED ONTO ACTIVE RWY AND ALMOST COLLIDED WITH A LNDG ACFT. PRIOR TO TAKING THE ACTIVE RWY; I STOPPED ON THE TXWY AND OBSERVED THE RWY AND ASKED IF MY PAX OBSERVED AN ACFT. NEITHER OF US SAW THE LNDG ACFT. HOWEVER; WHEN I TOOK THE RWY I OBSERVED THE ACFT ON A GO AROUND AND I TAXIED CLEAR OF THE RWY ONTO THE GRASS. THE OTHER SINGLE ENG CRAFT CLRED OUR ACFT BY ABOUT 50'. I DON'T KNOW HOW I MISSED SEEING THE LNDG ACFT; UNLESS HE WAS LOST IN THE RWY LIGHTS. A COLLISION WAS NEVER A REALITY SINCE THERE WAS ADEQUATE AREA TO TAXI CLR OF THE RWY; WHICH I DID. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: THE SMA ON APCH APPARENTLY DID NOT HAVE LNDG LIGHTS ON PRIOR TO STARTING GO AROUND AND POSSIBLY BLENDED INTO THE RWY LIGHTS. RPTR ADMITTED HE WAS ON 122.9 INSTEAD OF PUBLISHED CTAF 122.8; WHICH HE APPARENTLY DID NOT KNOW EXISTED. HE HAD NOT BROADCAST HIS INTENTIONS EVEN ON THAT FREQ. THOUGHT THE OTHER ACFT WOULD BE ON THEIR COMPANY FREQ. DID NOT TALK TO OTHER ACFT AND NO FAA INVOLVEMENT. ANALYST COUNSELED RPTR TO BE ON AND USE CTAF FOR HIS OWN SAFETY.