What was found
FLIGHT 8690, ENROUTE PDX-RBG AIR TURNBACK/DISCREPANCY. ON CLIMBOUT, THE ALTERNATOR FAILED, AS WELL AS, THE NR 1 COMM AND GENERATOR WERE INTERMITTENT. RETURNED TO PDX, NO EMERGENCY WAS DECLARED. LANDED WITHOUT INCIDENT. CORRECTIVE ACTION: MAINTENANCE REPLACED THE ALTERNATOR AND VHF ANTENNA. OPERATIONS CHECK OF GENERATOR WAS GOOD. AIRCRAFT RETURNED TO SERVICE. VHF ANTENNA P/N C598501-0202 S/N 4447.