NEW YORK, JULY 27 -- The union that struck NBC for 17 weeks in 1987 has rejected the company's four-year contract offer for the second time since April, the union said today. No walkout is imminent, however.

No strike vote has been taken yet and "we're trying to arrange further bargaining talks," said John Krieger, a spokesman for the National Association of Broadcast Employees and Technicians.

NABET members at NBC, voting in a mail ballot on the network's latest contract offer, rejected it 1,290 to 516, he said.

NBC said in a statement that it would not further revise its offer, which was changed slightly in April after the union rejected it.

The union's previous contract expired March 30, but its 2,373 members kept working.

The network, noting that contract talks have lasted seven months, said it would review ways to conclude the negotiations.

NBC spokesman Joseph Rutledge declined to elaborate on the network's strategy or to say whether NBC would implement its last contract offer. When the company did that in 1987, the union began its long strike.

Krieger said money was not a major issue. The main issues include jurisdiction, daily hires and "four-walling" proposals, he said.

Under the last, outside producers renting NBC facilities would not be required to use NABET crews employed by the network.