E120 ON VECTOR BY DEP CTL WAS GIVEN VFR TA AND AN INTERMEDIATE ALT ASSIGNMENT. E120 FLC SPOTTED A CESSNA AND THOUGHT THAT IT WAS THE TFC. A SECOND VFR BE90 WAS ALSO IN THE AREA AND THE E120 TOOK EVASIVE ACTION TO MISS IT.

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DEPARTED DHN ON IFR TO ATL. INITIAL CLRNC WAS TO 5000 FT DIRECT CSG. WHEN PASSING 3100 FT; CTLR ISSUED 3000 FT AS AN INTERMEDIATE ALT. AFTER ACKNOWLEDGEMENT; WE WERE GIVEN HDG 360 DEGS; VECTOR FOR CLB. CTLR ISSUED VFR TFC AT 11 O'CLOCK. WE IMMEDIATELY SPOTTED A SMALL CESSNA AT 12 O'CLOCK TURNING EBOUND. WE RPTED VISUAL ON TFC AND WERE CLRED TO 10000 FT. FO AND I WERE WATCHING CESSNA IN TURN TO MAKE SURE HE DID NOT TURN BACK INTO OUR FLT PATH; AS HE WAS ALSO AT 3000 FT. KING AIR WAS AT 3000 FT MOVING L TO R; CESSNA HAD MOVED TO OUR 2 O'CLOCK POS AND HE WAS NO LONGER A CONFLICT. KING AIR WAS SPOTTED FIRST BY FO AT 11:30 O'CLOCK AND 1/4 MI. HE IMMEDIATELY PUSHED OVER TO GO UNDER KING AIR. THIS ONE WAS CLOSE ENOUGH THAT I CRINGED WHEN WE WENT UNDER. I DIDN'T KNOW IF WE WERE GOING TO CLR HIM OR NOT. KING AIR WAS ON FREQ; BUT NOT PARTICIPATING IN RADAR SVC. CTLR SAID HE ONLY HAD ONE TARGET; SO WE SUSPECT THAT HE DID NOT SEE THE CESSNA BECAUSE PRIMARY TARGETS WERE MASKED. KING AIR APPARENTLY NEVER SAW US; AS IT DID NOT APPEAR HE TOOK ANY ACTION WHATSOEVER. CTLR VECTORED US THROUGH TRAINING AREA AT THE MOST COMMONLY USED ALT. THERE IS A LARGE SCHOOL THERE; AND ALL THE MIL PRIMARY FLT TRAINING IS VERY CLOSE BY. IT SEEMS THAT THE CTLR WOULD HAVE MADE A LITTLE MORE EFFORT TO KEEP US AWAY FROM A CONVERGING TARGET AT OUR ALT. HAD MY FO NOT SEEN HIM AT THE LAST MIN; WE WOULD HAVE HIT HIM. I KNOW IT'S A PAIN FOR A CTLR TO HAVE TO LOOK AT A SCOPE WITH ALL THE PRIMARY TARGETS DISPLAYED; BUT DOING SO COULD HAVE SAVED OUR LIVES HAD WE NOT SEEN THE KING AIR. THERE IS TOO MUCH TRAINING ACTIVITY IN CAIRNS AIRSPACE TO MASK NON-XPONDER ACFT. HAD HE SEEN BOTH TARGETS; THIS QUITE POSSIBLY COULD HAVE BEEN PREVENTED.