Early sales of television receivers ("sets") were hampered by the lack of regularly scheduled programming being broadcast. A few months after selling his first set in 1938, DuMont opened his own New York-area experimental television station (W2XVT) in Passaic, New Jersey. In 1940, the station moved to Manhattan as W2XWV on channel 4 and commenced broadcasting on June 28, 1942. Unlike CBS and NBC, which reduced their hours of television broadcasting during World War II, DuMont continued full-scale experimental and commercial broadcasts throughout the war. In 1944, W2XWV became WABD (a callsign derived from DuMont's initials). In 1945, it moved to channel 5, becoming the third commercial television station in New York. On May 19, 1945, DuMont opened experimental W3XWT in Washington, D.C.