ACR X DSCNT BELOW MVA HAD CONFLICT WITH RADIO ANTENNAS. SYS ERROR.

Narrative

I WAS WORKING COMBINED RADAR W AND E AT TUL; WHEN I TOOK A HDOF ON SMA X; IFR LEVEL AT 6000 FT. SMA X WAS LNDG AT RVS; A SATELLITE FIELD. I DSNDED THE SMA X TO 4000 FT AFTER A FEW MINS. IN THE MEANTIME; I BECAME PRETTY BUSY WITH ACFT STEPPING ON EACH OTHER ON THE 4 FREQS I WAS MONITORING. I DSNDED SMA X TO 3500 FT AND PUT HIM ON A VECTOR FO 240 DEGS; 3500 FT IS THE MVA IN THE AREA. SMA X WAS BASICALLY ALL THE TFC I HAD IN THE SE QUADRANT. I WAS PRETTY BUSY AT THIS TIME WITH MOST OF MY TFC W AND N. ANOTHER CTLR ASSISTED IN SOME COORD AND WHEN I ASKED TO SPLIT THE SECTORS THE CTLR HAD ALREADY STEPPED OUT. SMA X THEN CALLED AND ASKED IF HE COULD MAKE A R TURN AROUND THE ANTENNAS. AT THIS MOMENT; I NOTICED HE WAS AT 2500 FT (THE ANTENNA HT); I CLBED SMA X AND TURNED HIM AWAY FROM THE ANTENNAS. HE WAS APPROX 2 1/2 MI E OF THE ANTENNAS AT THIS POINT. I REMINDED SMA X HIS ASSIGNED ALT WAS 3500 FT; AND THE PLT SAID IT WAS 2500 FT. SMA X REACHED 3500 FT AND WAS REVECTORED TOWARD RVS. I DO NOT KNOW IF THE PLT MISSED HIS ALT IN DSCNT (DEVIATED) OR IF I MISSED AN INCORRECT READBACK. I DO KNOW WITHOUT A DOUBT THAT I ASSIGNED HIM 3500 FT.