ZME CTLR EXPRESSED CONCERN REGARDING THE HOST RADAR COVERAGE AS COMPARED TO THE BACK UP DARC-EBUS EQUIP.

Narrative

THIS IS NOT AN ANOMALY OR AN ISOLATED OCCURRENCE. THE FAA ACKNOWLEDGES THAT FACT. THE FAA DOES NOT; HOWEVER; VIEW THIS AS SIGNIFICANT. I DO. OUR PRIMARY RADAR SYS; OR HOST; DOES NOT DISPLAY ALL XPONDER-EQUIPPED (DISCRETE OR NON-DISCRETE CODES) ACFT IN THE AREA OF JBR (JONESBORO; AR); EVEN THOUGH THESE ACFT ARE IN AREAS OF KNOWN RADAR COVERAGE. I WAS WORKING AN IFR ACFT IN THE JBR AREA AT 4000 FT (DISPLAYED ON RADAR); AND THERE WERE VFR ACFT IN THE AREA THAT I WAS NOT DEPICTING ON RADAR. 1 ACFT 3 MI SW OF JBR AT 2500 FT; 1 ACFT 12 MI SW OF JBR AT 4500 FT; AND ANOTHER ACFT 5 MI N OF JBR AT 3500 FT. NONE OF THESE ACFT WERE DEPICTED ON HOST RADAR. HOWEVER; OUR BACKUP SYS; DARC/EBUS; WAS DISPLAYING THESE ACFT ON RADAR; WHICH IS THE ONLY REASON I KNEW THEY WERE THERE. THIS IS A COMMON OCCURRENCE; EVERY DAY; ALL DAY. I'VE EVEN HAD AN ACFT AS HIGH AS 11000 FT THAT WAS NOT DEPICTED ON MY RADAR SCOPE. THIS IS A SAFETY ISSUE. I CANNOT; CONTRARY TO THE STATEMENT BY MGMNT; CONTINUE TO RELY ON THE INTEGRITY OF THE RADAR DISPLAY.