Narrative:

I was working the departure east position and the radar presentation was suspect. I advised the supervisor. I later learned that my radar was not set to clt; but incorrectly to grm. This situation caused for additional separation that I had not been providing. Once the cause was determined; I had the radar switched back to clt and advised others to be cautious. The display was the only questionable thing (dropped primary radar tags; etc).

Google
 

Original NASA ASRS Text

Title: CLT TRACON CTLR EXPRESSED CONCERN REGARDING PROPER RADAR SEPARATION APPLICATION AS IT RELATES TO RADAR SOURCE.

Narrative: I WAS WORKING THE DEP E POS AND THE RADAR PRESENTATION WAS SUSPECT. I ADVISED THE SUPVR. I LATER LEARNED THAT MY RADAR WAS NOT SET TO CLT; BUT INCORRECTLY TO GRM. THIS SITUATION CAUSED FOR ADDITIONAL SEPARATION THAT I HAD NOT BEEN PROVIDING. ONCE THE CAUSE WAS DETERMINED; I HAD THE RADAR SWITCHED BACK TO CLT AND ADVISED OTHERS TO BE CAUTIOUS. THE DISPLAY WAS THE ONLY QUESTIONABLE THING (DROPPED PRIMARY RADAR TAGS; ETC).

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.