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ducted fi-om this location included a demonstration of theatre-size television pictures at RKO's 58th Street Theatre. In June, 1930, W2XBS was moved apain, this time to NBC's Times Sciuare Studio in the New Amsterdam Theatre Building. A month later NBC took over man- agement of the RCA station, and both companies intensified their re- search and broadcasting- experi- ments. A new one-kilowatt crystal- controlled transmitter replaced the original model, and late in the year an 80-line mechanical scanning sys- tem was demonstrated. -Although W2XBS was operated primarily for experiments, a defi- nite broadcasting schedule was maintained, consisting mainly of posters, photographs and moving objects, such as Felix the Cat and Mickey Mouse revolving on a pho- nograph turntable. Among the tests made by RCA- .\'BC in a survey of TV transmit- ting locations were those conducted from the roof of the General Elec- tric building in the summer of 1!):U. As a result of its findings, XBC selected the Empire State Building—the highest, most dif- ficult and most expensive location in the world — as its permanent transmitting site. By November of that year, equipment was installed which would transmit 120-line pic- tures scanned mechanically at 24 frames per second on a frequency of 50-56 megacycles. The original Empire State an- £ '% ENGI.VEEKS ERECT THE KIRST TV .A.NTEN.NA O.N THE EMI'UtE STATE BUILDING, 1250 FEET ABOVE THE STREET. tenna was mounted on two 12-foot poles. This simple construction was used by RCA-NRC for the first ultra- high - frec|uency television tests ever made in the world. In 1933, station W2XBS transmitted signals between New York City and Camden. N. J., comprising the first radio relay of any length in the world, the pi'edecessor of present- day radio relay systems. In those days, television was "just around the corner" but as it turned out, the new art still had a long way to go. During succeeding years television research was in- tensified ; the iconoscope, televi- sion's electronic "eye", was per- fected; the all-electronic experi- mental system transmitting pic- tures based on 240 scanning lines at 24 frames per second was fol- lowed by 343 lines at 30 frames per second. To accommodate each of these improvements, it was neces- sary to modify transmitting equip- ment and receivers. NBC began frequency modula- tion experiments from the Empire State station in March, 1934, and J8 THE THIRD MAST STOOD 35- ST HIGH WITH RI.VG-SHAPED DI- :-ES AS UPPER ELEMENTS AND A VIDEO TURNSTILE BELOW. 1939 —THE RADIATOR PICTURED BE- LOW WAS ONE OF THE UHF UNITS ADDED TO THE MAIN ANTENNA STRUCTURE FOR EXPERIMENTAL T'SE. 1946 THE PRESE.NT 01-FOOT SUPER- TURNSTILE ANTENNA WAS ERECTED WHEN NBC COMMENCED TELEVISION TRANSMISSIONS ON CHANNEL 4. ^rn