ACFT CAME IN CLOSE PROX WITH ANOTHER ACFT WHILE PREPARING TO LAND.

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ENRTE FROM ADDISON FIELD; TX; TO SAN ANTONIO INT'L; I WAS DIRECTED BY DAL TWR TO 'PASS OVERHEAD DALLAS LOVE; THEN PROCEED DIRECT.' MY ALT WAS 1500' MSL. AFTER TRANSITIONING LOVE FIELD; HDG 190 DEGS; ALT 1500'; AN SMT WAS GIVEN TO ME (SMA) AS TFC AT 12 O'CLOCK; SBND. TO MY KNOWLEDGE THE SMT NEVER INDICATED THAT HE SAW ME. THE SMT WAS DIRECTED TO CONTACT RED BIRD TWR ON 120.30. SHORTLY THEREAFTER I WAS DIRECTED TO CONTACT RED BIRD TWR ON 120.30 FOR TRANSITION THROUGH THEIR AIRSPACE. I CHANGED TO 120.30 AND MADE A STANDARD INITIAL CONTACT CALL. NO ANSWER. IN A FEW SECS SMT ATTEMPTS CONTACT ON 120.30. NO ANSWER. I TRY ONCE MORE AND DECIDE THAT PRUDENCE SUGGESTS THAT I SEPARATE MYSELF UNTIL COM CAN BE ESTABLISHED WITH RED BIRD. I CALLED; 'SMT; SMA--HOLY JESUS!' THE SMT WAS 200' TO MY RIGHT; LEVEL WITH ME; CLOSING; BUT EVADING. HE CAME WITHIN 100' BEFORE HIS TURN BECAME EFFECTIVE. HE MUST HAVE SEEN ME 3-5 SECS BEFORE I SAW HIM. HIS CLOSURE PATH WAS FROM MY 5 O'CLOCK. OBVIOUSLY WE MISSED. HE CAME BACK AROUND FOR LNDG AND I SEPARATED MYSELF AND EXITED RED BIRD TO THE S. I ATTEMPTED CONTACT WITH HIM SEVERAL TIMES; AND AFTER A FEW ATTEMPTS HE ACKNOWLEDGED THAT HE WAS ON 120.30; BUT NOTHING ELSE. AFTER CLEARING RED BIRD I CALLED LOVE TWR AND ASKED THEM IF RED BIRD WAS ON THE AIR. 'TO MY KNOWLEDGE; THEY OPEN AT 6 AM.' ANOTHER ACFT RPTED THAT THE TWR ACTUALLY OPENS AT 7 AM. 'NEWS TO ME;' REPLIED LOVE TWR. CONTRIBUTING FACTORS AND COMMENTS: 1) THE SMT POS AND INTENTIONS WERE NEVER RPTED TO ME. 2) EVEN THOUGH I WAS CALLED AS TFC TO THE SMT; HE NEVER (TO MY KNOWLEDGE) RPTED SIGHTING ME AND NO FURTHER MENTION OF ME WAS MADE BY LOVE TWR; EVEN THOUGH WE WERE BOTH ON HIS RADAR; SQUAWKING DISCRETE CODES AND (OBVIOUSLY) ON THE EXACT SAME FLT PATH. 3) LOVE TWR (SURLY DEVIL THAT HE WAS) NEVER BOTHERED TO TELL ME OF A FASTER AIRPLANE AT MY 6 O'CLOCK LINING UP FOR THE RWY I WAS TO OVERFLY (CENTERLINE). 4) MANY FACTORS CONTRIBUTED TO THIS NEAR MISS; BUT THE OVERRIDING ONE WAS A NOTED RELUCTANCE TO COMMUNICATE VITAL INFO. THE TWR CTLR WAS TOO BUSY IGNORING CALLS AND TRYING TO FIND SOMEONE TO BLAME FOR A SCREW UP ON ONE OF HIS DEPS TAIL NUMBERS. THE SMT DRIVER; ADMITTEDLY IN A VERY BUSY COCKPIT; SEEMED RELUCTANT TO TRIGGER HIS XMITTER AT ALL...