What was found
CLT - FLT 401 - EN ROUTE FROM LGA TO TPA, THE AIRCRAFT WEATHER RADAR BEGAN SPIKING IN VARIOUS QUADRANTS AT VARIOUS TIMES IN ALL RANGES BETWEEN 20-320 MILES. ADJUSTED GAIN FROM MINIMUM TO MAXIUM WITH NO IMPROVEMENT NOTED. RADAR GIVES UNRELIABLE PRESENTATION. FLIGHT DIVERTED TO CLT AND LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE REMOVED AND REPLACED THE WEATHER RADAR TRANSCEIVER. GROUND OPERATIONAL CHECK GOOD. NO DEFECTS NOTED. (M)