ACR WDB FLC EXPERIENCES LOSS OF COM WHILE ON VECTORS TO FINAL AT ATL; CROSSES APCH COURSE FOR OTHER RWYS AND GETS VECTORED AROUND FOR ANOTHER APCH AFTER THE APCH CTLR RE- ESTABLISHED CONTACT. NO APPARENT TFC CONFLICT.

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ON APCH TO ATL WE WERE BEING VECTOR TO FINAL FOR RWY 9R. WE WERE CLRED TO 3500 FT AND GIVEN A HDG OF 350 DEG. ALSO SPD REDUCTION TO 180 KTS. WE COMPLIED WITH ALL INSTRUCTIONS AND WERE TOLD TO SWITCH TO 118.30 FOR FURTHER CTL. I CHKED IN AND WAS TOLD OF OUR TFC; A COMMUTER ACFT. I CALLED THE TFC IN SIGHT AND WAS TOLD AGAIN THE SPD OF 180 KTS AND HDG 350 DEG. AS WE FLEW N THROUGH THE LOC I CALLED APCH; SUSPECTING A LOS OF COM. I TRIED RADIO #2 WITH NO SUCCESS AND THEN I CALLED ON 121.5. APCH CALLED US ON THE PREVIOUS FREQ WHICH THE CAPT HAD SELECTED ON RADIO #1 AND THEY VECTORED US AROUND TO FINAL AGAIN FOR A SUCCESSFUL APCH AND LNDG. IN THE INTERIM WE HAD CROSSED THE FINAL APCH COURSES FOR 9R AND 8L. EVERYONE IN THE COCKPIT HAD BEEN ON THE LOOKOUT FOR TFC AND NONE WAS SEEN. APCH CTL SAID NOTHING ABOUT ANY TFC CONFLICTS IN OUR EXCURSION. AS LUCK WOULD HAVE IT THIS ACFT IS NOT YET OUTFITTED WITH TCASII. AFTER SOME THOUGHT I WONDER IF WE WOULD HAVE BEEN MORE CORRECT TO HAVE MADE A QUICK TURN TO FINAL AND EITHER CALL TWR OR THE PREVIOUS APCH CTL FREQ. WE WERE FORTUNATE THAT IT WAS A SLACK ARR TIME.