A B757-200 FLC EXPERIENCES A POTENTIAL CONFLICT DURING A HDG TRACK DEV WHEN THE PIC PF TURNS THE ACFT TOO FAR TO THE L IN AN EARLY TURN FOR A RADIAL INTERCEPT OFF OF FUZ VOR SW OF DFW; TX.

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AFTER TKOF ON A VECTOR OFF THE SID FROM DFW; WE WERE GIVEN A CLRNC OF R TURN TO 280 DEG HDG. AFTER A SHORT PERIOD OF TIME; WE WERE TO INTERCEPT THE RANGER 250 DEG RADIAL OUTBOUND. I STARTED TO SET IN THE OUTBOUND RADIAL ON THE FMS. RANGER WAS NOT PART OF THE SID NOR WAS IT ON THE PLATE. I SPENT A LITTLE EXTRA TIME FINDING IT. THE CAPT; IN THE MEANTIME; STARTED A L TURN OFF THE 280 DEG RADIAL WITHOUT MY KNOWLEDGE. I TOLD HIM I WAS HAVING A PROB FINDING RANGER. I SOON REALIZED THAT WE WERE ON A HDG FURTHER S THAN WE OUGHT TO BE AND COMMENTED WE NEEDED TO COME BACK TO AT LEAST 250 DEGS. AT THAT TIME AT 10000 FT MSL AND CLBING TO 17000 FT MSL; A TCASII SOUNDED AND THE CAPT RESPONDED; LOWERING THE NOSE AS INSTRUCTED BY THE TCASII. ATC CAME ON THE FREQ AND TOLD US TO TURN R TO 280 DEGS. I ACKNOWLEDGED AND TOLD THEM WE WERE RESPONDING TO AN RA. LESSONS LEARNED: 1) THE PF SHOULD ALWAYS KEEP THE PNF INFORMED AS TO WHAT THEY ARE DOING; ESPECIALLY WHEN THE PNF IS HEADS DOWN. 2) WHEN A FIX IS NOT READILY AVAILABLE; ASK THE ATC AGENCY FOR A FREQ OR IDENT. SUPPLEMENTAL INFO FROM ACN 466000: I WAS PF. SUBSEQUENTLY GIVEN CLRNC 'TURN L; INTERCEPT THE RANGER 250 DEG RADIAL; OWN NAV.' I BEGAN A TURN TO THE L; DIRECTED PNF TO OVERLAY RAW DATA ON HSI TO TRACK OUTBOUND AS CLRNC RADIAL NOT PART OF ORIGINAL SID. WHILE TURNING AND CLBING; SOME CONFUSION AS TO RANGER OR MAVERICK; ROLLED OUT HDG 210 DEGS IN CLB. MAJOR LESSON LEARNED: SELF-INDUCED RA DUE TO EARLY COMPLIANCE WITH CLRNC; IE; TURN L WITHOUT HAVING NAVAID DEPICTED TO INTERCEPT. WORST DAY I HAVE HAD IN MY EXPERIENCE.