 Soon after his experimental Washington station signed on , DuMont began experimental coaxial cable hookups between his laboratories in Passaic , New Jersey , and his two stations . It is said that one of those broadcasts on the hookup announced that the U.S. had dropped an atomic bomb on Nagasaki , Japan , on August 9 , 1945 . This was later considered to be the official beginning of the DuMont Network by both Thomas T. Goldsmith , the network 's chief engineer and DuMont 's best friend , and DuMont himself . Regular network service began on August 15 , 1946 , on WABD and W3XWT . In 1947 , W3XWT became WTTG , named after Goldsmith . The pair were joined in 1949 by WDTV ( channel 3 ) in Pittsburgh . 
 Soon after his experimental Washington station signed on , DuMont began experimental coaxial cable hookups between his laboratories in Passaic , New Jersey , and his two stations . It is said that one of those broadcasts on the hookup announced that the U.S. <a href='been_done' title='1'><mark>had</mark></a> dropped an atomic bomb on Nagasaki , Japan , on August 9 , 1945 . This was later considered to be the official beginning of the DuMont Network by both Thomas T. Goldsmith , the network <a href='null_genetive' title='2'><mark>'s</mark></a>chief engineer and DuMont <a href='null_genetive' title='3'><mark>'s</mark></a>best friend , and DuMont himself . Regular network service began on August 15 , 1946 , on WABD and W3XWT . In 1947 , W3XWT became WTTG , named after Goldsmith . The pair <a href='uninflect' title='4'><mark>were</mark></a> joined in 1949 by WDTV ( channel 3 ) in Pittsburgh . 
Soon after his experimental Washington station signed on , DuMont began experimental coaxial cable hookups between his laboratories in Passaic , New Jersey , and his 2 stations . It is said that one of those broadcasts on the hookup announced dat the U.S. done dropped an atomic bomb on Nagasaki , Japan , on August 9 , 1945 . This was later considered to be the official beginning of the DuMont Network by both Thomas T. Goldsmith , the network  chief engineer and DuMont  best friend , and DuMont himself . Regular network service began on August 15 , 1946 , on WABD and W3XWT . In 1947 , W3XWT became WTTG , named after Goldsmith . da pair was joined in 1949 by WDTV ( channel 3 ) in Pittsburgh .