AP Error in event log

Has anyone every seens this an event log for a radio

18:09:53 UT : 03/02/07 : File C:/ISIPPC/pssppc.250/bsps/devices/whisp/fpgaapi.c : Line 1690 Ranging Diff : DC02
18:21:09 UT : 03/02/07 : File C:/ISIPPC/pssppc.250/bsps/devices/whisp/fpgaapi.c : Line 1690 Ranging Diff : FE5D
18:26:35 UT : 03/02/07 : File C:/ISIPPC/pssppc.250/bsps/devices/whisp/fpgaapi.c : Line 1690 Ranging Diff : FD04