Ted Dorf, the vice president and general manager of "easy listening" WGAY-FM (99.5), isn't looking for a brawl with the folks at the new "Easy 97" -- WASH (97.1) -- but he is a littled worried that listeners who keep Arbitron's rating diaries might mix up the two stations.

"I'm hoping it doesn't confuse listeners," says Dorf, who is quick to say that he isn't worried that 99.5's sizable audience will spin down the dial to the new soft rock station. "But there are a lot of lazy diary keepers out there."

While no station can copyright slogans or prevent another station from wearing the same label, beautiful music station WGAY has been using the slogan "easy listening" for nearly three years. Last Monday, the ratings-troubled WASH switched from its 1 1/2-year-old adult contemporary format to a lighter, softer sound, hoping to cash in on the daytime office listener between 35 and 44 years old. In an attempt to change its image, the Metromedia-owned outlet has registered both "Easy 97" and "E-Z 97" slogans with Arbitron and is using its WASH call letters only once an hour. Life's Full Cycle

It has been more than 20 years since Sondra Linden worked at a radio or television station, but that didn't stop her from getting back in the business. Last week, the former Miami television personality-turned-FCC lawyer-turned-real estate broker bought WMTG-AM (1150) for $525,000 at auction.

"I really didn't think I'd wind up with it," said Linden, who has been "acting as an intern at WOL-AM (1450) for several months to get some hands-on experience."

Linden bid on the tiny Gaithersburg facility without having seen it. She expects to keep the adult contemporary format until she can get a feel for the community's needs, she said.

WMTG, which operates with 1,000 watts of power during the day and 500 watts after sunset, was owned by Baltimore broadcaster James Swartz until recently. Until Swartz bought it for $750,000 in October 1984, the station was the nation's only all-comedy station, WJOK. Burd Back Campaign

Kathy Hammen, a pension analyst for the Plumbers and Pipefitters Pension Fund, doesn't like her morning routine to be disrupted and she says that WPGC-AM/WCLY-FM's (1580/95.5) firing of the David Burd half of the Baker & Burd morning show has made her mad enough to start a "Bring Back David Burd" campaign. Hammen and several friends have rented a post box, hoping to get enough letters of support from fans to force First Media management to reconsider the jock's axing on June 27.

"I think Jeff Baker is very talented, but I don't think his talent is effective without David," says the 32-year-old listener. Hammen says she gave the new show, Baker & Friends, a try but wasn't impressed. "What they're doing is really kind of stinky. I'm not listening as much now."

Asked why all the fuss, why she doesn't just change the station, the New Carrollton resident replies, "Why should I have to?"

The address is P.O. Box 2895, College Park, Md. 20740. Letter From the 'Boss' Jock

With Congress back home for the Independence Day holiday, President Reagan must have had a little extra time to listen to the radio. Last week, Ed Walker, the veteran announcer who began his career at WRC-AM (980) more than three decades ago and recently returned to the station, received a letter from the chief executive complimenting him on his "long career in radio, your warm personality, your sense of humor, and your encyclopedic knowledge of the music of my generation." Reagan ended the note with "from one radio announcer to another, good luck and God bless you."

Walker, who is blind, was "thrilled to death" and noted that the White House was "extremely thoughtful to send a copy of the letter in Braille." And the big band expert says he'd be happy to have Reagan as cohost one Sunday morning. Stay tuned. Marconi and More . . .

It looks as though Marconi's invention is really catching on in the United States. The FCC now reports that the total number of radio stations in the country has topped the 10,000 mark. As of the end of May, there were 10,002 licensed stations in operation, 4,838 broadcasting on the AM frequency, and 3,917 operating as commercial FMs. Another 1,247 on the FM band were listed as educational . . . WMAL-AM (630) says overnight reporter Larry Krebs has agreed to stay aboard on a free-lance basis starting in August. At the beginning of the month, the 34-year veteran was told that he'd lose full-time status at the end of July but could stay on as a stringer . . .The Fourth Annual National Kidney Foundation Volleyball Marathon gets under way at 8 Saturday morning on the Mall next to the Air and Space Museum. At 2, DC 101 fans can meet the air staff as they take on the Redskinette Alumni. Call 337-6600 to register to play . . . WWDC-AM's (1260) Bill Scanlan will emcee Sunday's 2 p.m. free concert by the Glenn Miller Orchestra at Springfield Mall . . . WPFW-FM (89.3) will air two experimental theater plays, "The Envelope" and "Conference at One," Monday starting at 1:30 p.m. The plays are produced by HOME: Theatre for New Columbia, a recently organized group "dedicated to presenting experimental and provocative theater for a black audience" . . . On Tuesday, WMAL's Trumbull & Core managed to raise $20,253 in only four hours in the sixth annual SOME (So Others Might Eat) Summer Camp Drive. The project takes needy senior citizens on a five-day vacation to West Virginia.