The company was co-founded by Ralph
Matthews and Karl Hassel in Chicago, Illinois as Chicago
Radio Labs in 1918 as a small producer of amateur radio
equipment. The name "Zenith" came from its founders'
call sign, 9ZN. They were joined in 1921 by LCDR Eugene
F. McDonald, and Zenith Radio Company was formally
incorporated in 1923. Zenith introduced the first
portable radio in 1924, the first mass-produced AC radio
in 1926, and push-button tuning in 1927. It added
automobile radios in the 1930s, with its Model 460
(bragging it needed no separate generator or battery)
selling at $ 59.95. The first Zenith TV set would appear
in 1939, with its first commercial sets in 1948. The
company would eventually go on to invent such things as
the wireless remote control, FM multiplex stereo,
high-contrast and flat-face picture tubes, and the MTS stereo
system used on analog television broadcasts in the US and Canada (as
opposed to the BBC-developed NICAM digital stereo sound
system for analogue TV broadcasts, used in many places
around the world.) Zenith was also one of the first companies to
introduce a digital HDTV system implementation, parts of which
were included in the ATSC standard starting with the 1993 Grand
Alliance.