Skylane 182/RG Turbo Skylane/RG
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 3
Human-Machine Interface
ATC Issue All Types; Conflict NMAC
Flight Crew Became Reoriented
ATC Equipment / Nav Facility / Buildings; Equipment / Tooling
Aircraft X reported that he has missed a small experimental aircraft by 100 FT. I never saw the Aircraft on radar until after the report and the pilot did not see the Aircraft on TCAS till the last minute but was able to avoid the aircraft. The aircraft had no mode C and Conflict alert never went off. Conflict alert on ERAM does not seem as affective as Conflict Alert on HOST. VFR aircraft without an ALT readout should be subject to conflict alert.
Controller reports that pilot responded to traffic that he did not see until the pilot reported it. Pilot did not see traffic until TCAS alerted him at the last minute. Controller suggests ERAM vs. Host problem.