Negotiators for NBC and the union representing striking radio and television producers, writers and technicians met with a federal mediator yesterday to discuss the sale of NBC's radio networks.

Issues related to the eight-week-old strike against the network were not raised during the 3 1/2 hours of talks, the first since July 23, said network spokeswoman McClain Ramsey.

"It was an informational session" to discuss the impact of the sale on employes represented by the striking union, the National Association of Broadcast Employees and Technicians, she said.

"What will be happening with the NABET {employes} that are involved with the radio sale we don't know yet," she said. "That probably won't be resolved until after the strike."

The $50 million sale of the radio networks to Los Angeles-based Westwood One Inc. was completed yesterday. Included are NBC's radio news network; Talknet, a nightly talk network; The Source, a youth-oriented network; and the syndicated NBC Radio Entertainment.

Talks were scheduled to resume this morning in Washington, when strike-related issues were expected to be discussed.

Meanwhile, an independent management company hired by NBC reported to the network that NBC News has more employes than it needs and that their time is too often wasted, according to a report in The New York Times.

The Times story quoted unidentified network executives as saying the consulting firm's information leads them to conclude that cuts in the NBC News staff are probably necessary.

The strike has kept 2,800 radio and television producers, writers, technicians, artists and desk assistants off their jobs since June 29, when the network imposed the conditions of its last offer