What was found
RADAR DISPLAYED FALSE TARGETS AND INCORRECT ATTENUATION BARS. TARGETS APPEARED ON DEPARTURE BETWEEN 3000 AGL AND 15,000 FT. RADAR WAS IN "WX+T", "AUTO" GAIN WAS AUTO. ACTUAL WEATHER, SMALL CONVECTIVE CELLS, ON DEPARTURE WAS DEPICTED CORRECTLY. FALSE TARGETS APPEARED IN A LINE AT THE 11:30 POSITION FROM 4-18 MILES WITH 3-4 MILE SPACING. ACFT GROUNDED. CREW REPORTS FALSE TARGETS WENT AWAY AND WEATHER OPERATED NORMALLY WITHOUT FAULTS REMAINDER OF FLIGHT. PERFORMED WEATHER BITE REF FIM TASK 34-43, TASK 801, SEVERAL TIMES. NO FAULTS NOTED.