AN ACR LGT FOULED UP ITS COMS IN THE LNDG PATTERN. WHEN THEY GOT THAT STRAIGHTENED OUT; THEY HAD A TCASII ADVENTURE.

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ABOUT A MI INSIDE THE MARKER FOR RWY 27L AT MIA; THE CAPT ASKED IF WE HAD BEEN TURNED OVER TO TWR BY APCH CTL. THE FO SAID NO. CAPT SAID GO TO TWR. THE FO WAS VERY NEW IN THE SEAT COMING FROM WDB ENGINEER (HIS PRIOR BACKGND MIL). HE HAD TROUBLE FINDING TWR FREQ. IN THE MEANTIME; THERE WAS TFC ON OUR RWY; SO THE CAPT BEGAN TO S-TURN. THE FO TOOK AN EXCEPTIONALLY LONG TIME LOCATING THE FREQ AND IT WAS NOW BECOMING EVIDENT THAT WE WERE GOING TO HAVE TO GAR. CAPT SAID 'TELL TWR WE'RE GOING AROUND' AND THE FO HAD DIALED IN GND CTL; NOT TWR. IN THE GAR; HE SWITCHED BACK TO APCH; WHO GAVE US GAR INSTRUCTIONS AND SAID GO TO TWR. THE FO FINALLY GOT TWR AND THEY WERE UPSET (UNDERSTANDABLY). TWR VECTORED US FOR ANOTHER APCH. ON DOWNWIND THE FE CALLED THE FIELD AND CAPT AND FO RESPONDED 'IN SIGHT.' TWR ASKED IF WE HAD FIELD AND TFC ON FINAL IN SIGHT. THE FO RESPONDED 'AFFIRMATIVE' ALTHOUGH THE CAPT DID NOT HAVE THE TFC. ON BASE; OUR TCASII ALERTED 'TFC; TFC' TO THE FO AND THE FE. IT WAS OBVIOUS THIS WAS PARALLEL TFC TO RWY 27R. WE SAW THE TFC AT 1-2 O'CLOCK; BUT THE CAPT WAS CONCENTRATING ON THE TCASII ALERT; AND OVERSHOT RWY 27L. WELL; NOW THE TFC IS AT 12:30 - 1 O'CLOCK POS AND LESS THAN 1 MI AND THE TCASII GAVE AN RA; SO THE CAPT IMMEDIATELY EXECUTED A HARD R TURN TO BREAK OFF THE APCH. HE TOLD THE FO TO 'TELL THE TWR WE'RE DOING A R 360 DEG TURN. REQUEST VECTORS FOR THE APCH.'