AN ARRIVING B737 IN DSCNT WITH OPPOSITE DIRECTION CLBING TFC IS TEMPORARILY LOST ON THE ARTCC CTLR'S RADAR SCOPE DUE TO COASTING AND LOSS OF XPONDER CODE. THE CTLR ISSUED TURNS TO BOTH ACFT FOR SEPARATION.

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ALL ACFT DEVIATING AT AIRSPACE BOUNDARY WITH ZMA. ACR X; A B737; FROM PIT TO TJSJ; SEBOUND. ACR Y; A H/L101; FROM TJSJ TO ATL NWBOUND. ACR Y CLBING TO FL350 FROM FL270. ZMA COORDINATES DSCNT FOR ACR X FROM FL330 TO FL270 WITH D-SIDE (NON RADAR POS). ACR X IS ALSO DEVIATING. ACR Y ISSUED DIRECT ROUTING TO CRG. I OBSERVE THAT THIS WILL CONFLICT WITH ACR X AND ISSUE A 15 DEG TURN TO THE R. HE IS CLBING THROUGH FL290. ACR X CHKS ON FREQ AND I ISSUE HIM A 15 DEG TURN TO THE R ALSO. ACR X'S DATA BLOCK GOES IN TO COAST. I ISSUE AN ADDITIONAL 15 DEG TURN FURTHER R TO ACR Y AND INFORM ACR X I HAVE LOST HIS XPONDER AND FOR HIM TO SWITCH TO THE OTHER AND SAY ALT. HIS RESPONSE IS 'DSNDING.' ACR Y IS INDICATING FL300 CLBING. THE LAST 'HIT' SHOWS ACFT 14 MI APART BUT I CANNOT TELL ACR X'S DIRECTION. ACR X IS NOW ON SECOND XPONDER BUT WITH WRONG SQUAWK. THIS HIT SHOWS ACFT 6 MI APART. I INFORM ACR X AND HE ANGRILY RESPONDS THAT IF THE ACFT'S XPONDERS (HIS AND ACR Y) CAN SEE AND COMMUNICATE TO EACH OTHER WHY CAN'T OUR RADAR SEE HIM. SOLUTIONS: GIVE US BETTER RADAR. BOTH XPONDERS SHOULD BE SET TO SAME BEACON CODE.