RPTRS HAVE QUESTIONED THE RADAR COVERAGE AND SAFETY DATA DISPLAYED; OR AT TIMES NOT DISPLAYED; AT ZHN CERAP. RADAR COVERAGE IS FROM A SINGLE ANTENNA LOCATED ON OAHU ISLAND AND IS OPERATIONAL FOR APPROX A 300 MI RADIUS. SOME TRACKING ANOMALIES WERE FOUND TO BE ACFT EQUIP AND THE OPERATORS COOPERATED IN MODIFICATIONS TO THEIR XPONDER ANTENNA SYS. ANOTHER PROB IDENTED WAS RELATED TO AIRSPACE DEVS BY CTLRS.

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ACFT X TRAVELING ALONG V2 SEBOUND TOWARD LNY VORTAC ON 290 DEG RADIAL FOR ARR JETS INBOUND TO KAHULUI; ACFT X TURNED TO A 130 DEG HDG AND LOST RADAR DATA. WAS UNABLE TO DSND ARR TFC UNTIL RADAR CONTACT WAS REESTABLISHED AT LNY 265 DEG RADIAL 12 DME. SAFETY DATA NOT BEING DISPLAYED TO CTLR. CALLBACK CONVERSATION WITH SPECIALIST REVEALED THE FOLLOWING INFO: ANALYST WAS UNABLE TO CONTACT ANY OF THE 3 RPTRS. CALLED ZHN AND SPOKE TO A SPECIALIST REGARDING THEIR RADAR COVERAGE. THEIR ANTENNA IS LOCATED ON THE ISLAND OF OAHU AND HAS COVERAGE TO APPROX A 300 MI RADIUS. HE STATED THAT PART OF THE COVERAGE PROB WAS THE XPONDER ANTENNA LOCATION ON SEVERAL OF THE INTERISLAND CARGO CARRIERS. THE OPERATORS OF THESE CARRIERS HAVE MODIFIED THEIR ACFT ANTENNAS AND THAT HAS ELIMINATED MANY PROBS REGARDING FLT FOLLOWING AT THE OUTER ISLANDS. THE OTHER PROB HAS ALLEGEDLY BEEN CAUSED BY SEVERAL AIRSPACE DEVS THAT INVOLVED CTLRS. DURING DATA REDUCTIONS FOR INVESTIGATION OF THESE DEVS; THE CTLRS QUESTIONED THE FINDINGS AS TO HOW VALID THEY WERE. SPECIALIST DID NOT KNOW IF ANY UCR'S HAD BEEN FILED. SUPPLEMENTAL INFO FROM ACN 332167: MIL Y (C135) AT FL250 CLBING TO FL370 FROM LIH DIRECT LNY LOST RADAR; SAFETY DATA NOT BEING DISPLAYED TO CTLR FROM APPROX KAENA POINT TO KOKOHEAD OVER ISLAND OF OAHU.