August 30, 1981

SOUTHAMPTON IT has been a summer for Russian music and culture on Wildwood Lake, and some of the neighbors are complaining. The music comes from the Alonushka Camp, where, beginning in July, emigres from the Soviet Union, most of them Jewish, have been vacationing in a Russian atmosphere provided on a 10-acre camp by the new owners, Marianna and Victor Shulman. Mr. Shulman, an American citizen who left the Soviet Union in 1976, is a singer, composer and impresario well known in emigre circles. Many evenings he plays a mildly amplified electric piano and sings Russian ballads, folk songs and pop for an appreciative and nostalgic outdoor audience of between 50 and 75 overnight guests. While by the standard of even the most subdued rock concert the music is by no means loud, Mr. Shulman's rich voice is strong and apparently loud enough to be heard at the homes of at least 28 of the Shulmans' neighbors along the shore.

BAYPORT THE little blue and white plane taxied slowly along, jolted by the ruts and weed clumps. Near the line of trees it turned. The grassy fields stretched away in front. There was no control tower, no need to radio for permission to take off. The air traffic controllers and their strike meant nothing here. The pilot glanced overhead to both sides. Then he pulled out the throttle. The engine roared to life, sending the bouncing and shivering plane down the runway. Suddenly, the pilot pulled the wheel back and the plane shot upward. The field, lined on one side with a row of antique biplanes, dropped away. The houses disappeared under the dark green tree leaves. Behind the plane, Bayport Aerodrome shrank to a tiny sliver among the housing developments of the South Shore. Once the Island was dotted with small airports with grass runways like Bayport. They served as nurseries for generations of Long Island pilots. But the eastward march of the suburbs drove up land values and taxes, making the fields uneconomical. The coup de grace usually came when homeowners protested about the noise and danger associated with the small airports that had been engulfed by the housing developments. Since World War II, small fields in Rockaway, Massapequa, Amityville, Deer Park, Commack, Hauppauge and Riverhead have closed.

Voyager 2 traversed 1.24 billion miles in four years to reach Saturn last week, somewhat the worse for wear but nevertheless able to reveal the largest, deepest crater in the Saturnian moon system - a rift 250 miles wide and 10 miles deep on Tethys. The space probe also reconnoitered the relatively uncratered moon Enceladus and measured starlight flashing through the planet's rings in an effort to calculate their widths and count what may be thousands of ringlet subdivisions. Damage to the vehicle included a jammed camera swivel platform, exact cause unknown as of late yesterday, which meant some missed pictures. Aside from that, scientists rejoiced in a mission that may explain, among other things, the anomalous behavior of the moon Hyperion and dismiss a popular explanation of wide gaps in Saturn's ring structure.

After shopping in vain for a Manhattan apartment she could afford, Margaret Erlanger, a marketing assistant at American Express, recently purchased a 3 1/2-room co-op in a high rise in Forest Hills, Queens, for $26,000. Although she is not happy in Queens and plans to use the apartment ''as leverage to get back to the city'' she is pleased with the economics of her move. Her monthly maintenance charge of $340 includes gas and electricity. The current average selling price of apartments in Manhattan is $65,000 to $75,000 a room, with a yearly maintenance of $1,900 to $2,200 a room, according to Brewster Ives, chairman of the board of Douglas Elliman-Gibbons and Ives, which manages approximately 200 cooperative buildings in Manhattan. Banks usually require that the monthly cost of paying off a co-op loan, including the monthly maintenance, not exceed 25 percent to 30 percent of the purchaser's income. At today's interest rates of 16.75 percent or more, buyers with a 25 percent downpayment would need an income of over $40,000 to qualify for an apartment with a $65,000 price tag and a monthly maintenance of $400.

Federal agents posing as underworld dealers in stolen securities seized three men, an arsenal of weapons and more than $50 million in negotiable bonds Friday night in a sting operation that unfolded in a midtown hotel suite and cloak-and-dagger chases through New York City. The sting, disclosed yesterday by the Federal Bureau of Investigation, recovered what was believed to be one of the largest blocks of stolen or missing loot in criminal annals. By comparison, the largest cash robbery in the nation's history, at the Lufthansa terminal at Kennedy International Airport in 1978, netted $5.8 million. The F.B.I. operation involved two tense confrontations with suspects at the Grand Hyatt Hotel on 42d Street near Park Avenue and the clandestine, five-hour pursuit of two of the suspects in a rented limousine through Manhattan and Queens to four pickup points for the missing bearer bonds.