EMB120 FLC RECEIVES TCASII TA WHILE BEING VECTORED TO INTERCEPT LOC AT PNS.

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WE WERE BEING VECTORED FOR THE ILS RWY 17 APCH AND HAD REQUESTED DEVS FOR WX. DEVS WERE APPROVED AND WE WERE TOLD TO ADVISE WHEN WE COULD TURN TOWARD THE LOC; AND THAT THE ARPT WAS TO OUR S. AFTER CLRING WX TO OUR L (S) WE ADVISED WE WERE ABLE TO TURN INBOUND. THE CTLR ASSIGNED A HDG OF 080 DEGS; VECTORS TO THE LOC. DURING THE TURN OUR TCASII GAVE AN AURAL WARNING OF 'TFC' WE OBSERVED TFC DISPLAYED ON TCASII 2 MI TO OUR R AND 200 FT BELOW. WE DID NOT APPEAR TO BE CONVERGING. CTLR ISSUED FURTHER TURN TO 030 DEGS AND ASKED US TO TIGHTEN THE TURN. THE CTLR ADVISED OF T34 TFC PASSING BEHIND; AND SAID HE HAD NEEDED A TIGHTER TURN. DURING THIS MANEUVER WE WERE AT THE STEEPEST BANK ALLOWED BY OUR COMPANY STANDARDS FOR NORMAL OPS. WE WERE NOT MADE AWARE OF ANY ABNORMAL SIT THAT WOULD REQUIRE US TO EXCEED THIS LIMITATION IN THE INTEREST OF SAFETY; UNTIL AFTER THE CONFLICTING TFC WAS BEHIND US. I BELIEVE THAT USE OF DIFFERENT FREQS (UHF/VHF) BY THE SAME CTLR CONTRIBUTED TO THIS EVENT. WE WERE ABLE TO HEAR XMISSIONS TO THE T34 BUT NO REPLIES; AND THE CTLR SEEMED RUSHED AND DISTRACTED IN HIS INSTRUCTIONS TO US.