NBC notified the National Association of Broadcast and Technical Employees (NABET) late yesterday that the network intends to implement its final contract offer -- made March 31 -- at 12:01 a.m. Monday, June 29 ...

Day Krolick, vice president for labor relations at NBC, confirmed yesterday that he had informed top NABET negotiator Thomas F. Kennedy of the decision by telephone. A letter formalizing the notice will be delivered today ...

Apparently in anticipation of the notice, the NABET negotiating committee earlier yesterday had adopted a motion instructing Kennedy that if he received such a notice, he was to tell the network NABET would strike at the time the offer is implemented ...

The motion also said that NBC has until that time to "peacefully renegotiate" the contract ...

Some 2,800 NBC employes, including 300 at the NBC News bureau and WRC here, would be affected by the strike action ...

Union members include camerapersons, news writers, sound men, news assistants, technicians and maintenance workers in New York and at most NBC-owned stations and bureaus around the country. The network has been training management personnel to take over key duties should a strike occur...

Tuesday, at NABET's request, the parties had met in New York before a representative of the Federal Mediation and Conciliation Service, for the first time since the previous 4-year contract expired April 1...

At the Tuesday meeting, according to one NBC source, NABET refused to provide NBC with any written proposals, although the union told the network it had "hundreds" of changes to make in its previous last offer ...

NABET said it had offered to consider several of the network proposals if modified. But NBC said it was sticking with its final offer ... and that it could take the next step -- notifying NABET of its intention to implement the offer -- within 48 hours ...

In late May, NBC signaled yesterday's action by notifying all 8,000 employes that it intended to implement its final offer for a two-year contract, but at the time set no specific date ...

Also in the News It was woefully short of a laugh track, car chases and other forms of primetime mayhem -- just an hour of television that made you feel good ...

So TV Column fans won't be surprised to learn that "Twenty Years on the Road With Charles Kuralt" Wednesday night on CBS managed only a so-so 11.9 national Nielsen rating and a 23 percent audience share from 8 to 9 p.m. (each rating point represents 874,000 TV homes) ...

Although the TV industry's taste runs to loud-mouth comics in such matters, it's about time that Kuralt is recognized for what he is -- one of TV's very, very few candidates for national treasure (and much too young to be pickled and placed in a niche at the Museum of Broadcasting). Let's just hope CBS News is smart enough to keep him around for years to come and the hell with the ratings ...

Baltimore's Channel 45, where a lot of Captain Airwaves' favorite movies play, says there will be an increase in the power of its signal around the first of July but it won't reach full power again until about Aug. 1 ...

The UHF station has been in the process of moving its transmitter from Ellicott City to TV Hill in Baltimore whence all the big VHF stations transmit ...

Channel 5 yesterday announced that Maury Povich's show, "A Current Affair," will not only air at midnight, starting Monday, but will appear daily at noon, in the old "Panorama" time slot (in the absence of word from WTTG, we'll assume the noon broadcast will be a rerun of the previous evening's telecast from New York) ...

Povich's news show is a hit in New York on WNEW at 7:30 p.m. ...

WTTG will move "Alice" to 12:30 p.m. with the change. The station also announced that "Value Television," which will move to 1 p.m. on Monday, will be pulled from the air after July 3. No replacement for that one-hour show has been chosen ...

The NBC News special, "Six Days Plus 20 Years: A Dream Is Dying," originally scheduled to air next Wednesday against the second hour of CBS News' "The Soviet Union Seven Days In May," was rescheduled yesterday for Wednesday, July 1 at 10 p.m. ...

The one-hour documentary, anchored by Tom Brokaw, examines Israeli-Arab relations on the 20th anniversary of the Six Day War ...

A spokesman for NBC News said yesterday that NBC had scheduled its documentary first, expecting a strong audience lead in at 10 from "Facts of Life" and "Night Court" but decided on the move because "both documentaries cover important subjects and shouldn't compete with each other" (NBC News has just moved to the top of the ballot for the 1987 Network News Good Guys Award) ...

Moving Right Along Bill Monroe has been named editor of the Washington Journalism Review, succeeding Katherine Winton Evans, who has been editor since 1982 ...

Until his retirement from the network in 1984, Monroe had been an NBC News executive and correspondent for 26 years, which included 10 years as moderator and executive producer of "Meet The Press" ...

WJR president Jessica Catto and the family-owned H&C Communications -- whose properties also include six TV network affiliates -- has donated the magazine to the University of Maryland College of Journalism and an endowment fund is being set up to aid the enterprise...

The first (September) issue under the new management will appear in August ...

Reese Cleghorn, dean of the College of Journalism, who replaces Catto as president of WJR, yesterday said Kay Evans "has superbly led the magazine to a position of national prominence and influence. With his great talent and professionalism, Bill will build on that foundation for a strong future" ...

Meanwhile, Marvin Kalb, another alumnus of NBC News and "Meet The Press," has been named the first Edward R. Murrow Professor of Press and Public Policy at the John F. Kennedy School of Government ...

Kalb left NBC earlier this year to become director of the school's Joan Shorenstein Barone Center on the Press Politics and Public Policy ...

"Ed Murrow hired me 30 years ago (at CBS News)," Kalb said in a statement. "I feel as though I have just come full circle. I'm proud and very pleased ... " ...

NBC News yesterday announced that Maria Shriver will be the new host of "Main Street" when it returns in September with eight monthly broadcasts aimed at young teen-age audiences ...

Shriver replaces Bryant Gumbel, whose schedule, with the approaching Olympics, is getting a tad crowded ...

NBC also announced that Don Bowers, who has been senior producer on "Main Street," will be executive producer. He replaces Marty Ryan, who has been named executive producer of "Today" and "Sunday Today" ...

Shelley Lewis, who has been general manager of affiliates news services, will become senior producer of "Main Street" ...

Shriver has previously been named as co-anchor, with Boyd Matson, of the "Sunday Today" show, which NBC News debuts in September ...

The sixth and final game of the NBA cham pionship series featuring Los Angeles and Boston earned a 17.3 national Nielsen rating and a 43 percent audience share on Sunday afternoon ...

That was the highest rating ever for a daytime NBA or college basketball game on any network ...

The series averaged a 15.9/32, which also makes the Lakers-Celtics matchup the most-watched NBA championship series ever ...