RPTR STATES THAT THE LITTON RVDS COM EQUIP HAS NOT WORKED PROPERLY SINCE ITS INSTALLATION. THE EVENT DESCRIBED BY THE RPTR IS ONE OF MANY PROBS WITH THE SYS.

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TWR FLT DATA SPECIALIST (ATCS) CALLED ARTCC FLT DATA POS TO RECONFIGURE FLT DATA PRINTER. THE NON CTL CONVERSATION BLED OVER ONTO THE LNDG (SHOUT LINE) USED FOR CTL INSTRUCTIONS BTWN RADAR CTLRS. I RECEIVED A PHONE CALL FROM ZAU AREA SUPVR EXPRESSING A SAFETY CONCERN. THE RADAR CTLR AT THE CTR (ZAU) WAS DISTR AND CONFUSED BY THE NON PERTINENT CONVERSATION ON THE CTL LINE. THE LITTON RVDS HAS NOT WORKED PROPERLY SINCE IT WAS INSTALLED APPROX 2 YRS AGO. THIS PARTICULAR PROB HAS GONE UNCORRECTED SINCE INSTALLATION. LCL FAA TECHNICIANS ARE UNABLE TO TROUBLESHOOT THE PROB. RECENT PROBS INCLUDE SEVERAL TOTAL COMS FAILURES WHERE BACKUP RADIOS WERE NEEDED. A UCR HAS BEEN FILED ON THIS PIECE OF EQUIP (LITTON RVDS). CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR REVEALED THAT SINCE THE RPT WAS WRITTEN; THE FACILITY HAS NOT HAD THE SHOUT LINE BLEED-THROUGH PROB. THIS PARTICULAR PROB IS INTERMITTENT AND IS USUALLY CARRIED OVER ON THE DAILY LOG AS AN OPEN ITEM; EVEN THOUGH THEY HAVEN'T HAD AN INCIDENT OF THIS LATELY. OTHER COMS OUTAGES INVOLVING THE LITTON RVDS EQUIP ARE STILL OCCURRING INTERMITTENTLY. RPTR ATTRIBUTES SOME OF THE PROBS TO THE LACK OF QUALIFIED TECHNICIANS.