LOS ANGELES, AUG. 26 -- While President Reagan talked peace inside a city hot l today, striking NBC-TV employes gathered outside and smashed appliances with a sledgehammer in a show of frustration.

About 60 striking NBC producers, writers and technicians carried picket signs outside the Century Plaza Hotel before and during Reagan's address.

In the speech, Reagan challenged the Soviet Union to bring a spirit of glasnost, or openness, to its military affairs.

Leaders of the National Association of Broadcast Employees and Technicians, which struck the network two months ago, used Reagan's appearance to dramatize their discontent.

During the "NABET Bash" outside the hotel, sledgehammer-wielding strikers crushed a General Electric refrigerator, washing machine and dryer. General Electric bought NBC in 1986.

"Reagan has a long, long history as a General Electric spokesman and he was the one who sold the management philosophy to the employes," said local NABET spokesman Chris Hanson. General Electric has looked to trim down NBC since the takeover, he said.

"But they are making a lot of money. This is not a dying industry. In fact, it is extremely profitable," Hanson said.

Nonunion NBC workers have taken the place of union camera crews in covering news events, including Reagan's speech today.

"We want everyone to know we are still here," Hanson said. "There are nonunion workers for NBC in there and we want people to remember us."

While several strikers took their turn with the sledgehammer, dozens of union members chanted "GE, GE, GE."

In Washington, negotiators for NBC and the union resumed talks today aimed at resolving the dispute. The two sides spent 3 1/2 hours Tuesday with a federal mediator, but discussed only the sale of NBC's radio networks.

The $50 million sale of the radio networks to Los Angeles-based Westwood One Inc. was completed Tuesday.

The key issue in the strike is NBC's demand for more flexibility in the use of part-time free-lance workers.

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.