GA SMA UNAUTH LNDG AND NMAC WITH GA SMA IN ASH ATA.

Narrative

ON JULY OF THIS YEAR; I WENT TO NASHUA (ASH) AND USING UNICOM CALLED THE ARPT NUMEROUS TIMES TO NO AVAIL. AN ACFT; ALSO IN THE PATTERN; TOLD ME NOT TO EXPECT AN ANSWER FROM UNICOM AS THEY NEVER ANSWER. IN SEPT THIS YEAR; I DEPARTED NEWPORT ENRTE TO TANNER HILLER FOR BREAKFAST (DINER CLOSED). DEPARTED FOR KEENE (EEN) CALLED ON UNICOM; NO ANSWER. I THEN CALLED BLOCK ISLAND (BID) FOR RADIO CHK ON SAME FREQ (123.0). THEY HEARD ME LOUD AND CLR; AFTER WHICH EEN FINALLY ANSWERED AND SAID THEY WERE FOGGED IN (MORNING GND FOG). I; AT THIS POINT; DECIDED TO GO TO NASHUA (ASH). CURRENT SECTIONAL (NY) AND CURRENT TCA (BOSTON) CHARTS IN ACFT; BOTH SHOWING ASH AS UNCTLED 122.7. AFTER REPEATED CALLS AND NO RESPONSE; I FOLLOWED SAME PROC AS IN JULY OF ANNOUNCING DOWNWIND; BASE AND FINAL. THE NEAR MISS OCCURRED AT ABOUT 200 AGL ON FINAL. WHILE IN MY LNDG FLARE; A VOICE SAID ON 122.7; 'ACFT ON SHORT FINAL. WHAT IS YOUR CALL SIGN?' (122.7 FREQ) I TRIED TO ANSWER AFTER I LANDED BUT AGAIN; NO ANSWER. I TAXIED TO FBO AND WAS TOLD THE TWR WANTED TO TALK TO ME. MONITOR THE PUBLISHED FREQ ON CHARTS. DON'T RELY ON NOTAMS AS NO ONE I TALKED WITH IN NEWPORT (2B4) KNEW OF THIS 3 WK OLD TWR.