Technical Information

Schematics, Diagrams, Links, Misc Info.

Last Update 01-17-2010

Any comments regarding this page, operation or design, please
e-mail
Wes Black at: wesblack@calrad.com

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Who discovered what and when (1820 - 2000)

The Timetables of Electronics the Chronology of the most important people and events in the history of Electronics. CALRAD products & developments are also listed

 Audio-Video- RF Cable Information
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You must download the Supercad Schematic viewer first to view and print out our schematic diagrams.

Select the Series

10,15, 20, 25, 30, 35, 40, 45, 55, 60, 70, 72, 75, 85, 90, 95, Misc

10 series - Microphones, Microphone Accessories
15 series - Headphones, Headphone Junction boxes
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20 series - Speakers & Speaker systems, Paging horns
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25 series - Controls -Audio, Home Theater
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28 series - Controls -Audio, Home Theater
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30 series - Connectors Audio, Video, Computer
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35 series - Adapters, Audio, Video
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40 series - Switches for Security, Audio - Video - RF, Relays
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45 series - Power Supplies, Variac's, Inverters, Transformers
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55 series - Audio & Video cables
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70 series - Telephone Accessories
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72 series Networking Products
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75 series - Video Accessories, Connectors
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90 series - Hardware, Chassis boxe's, Tools, Lamps, Misc.
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95 series - Security & Paging amplifiers, Amplifiers
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Misc
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If you need technical information on a specfic part please let us know. Check this page often, updates & new files are constantly being added.

 

Audio - Video - RF Cable Information

 

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The Timetables of Electronics & Calrad's  product developments

(1820 - 2002)

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2002 May, Calrad adds  solderless Designer wall plates to line, 28 series.

2002 March, Calrad adds  RCA, BNC, F compression connectors 75-534PS and75-599A 3-way crimping tool.

2002 January, Calrad Releases Catalog No. 59.
2001 Calrad intoduces Designer wallplates for HDTV.
2001 Calrad Lauches 59-2001 Brochures with over 160 new products.
2000 Calrad developes right angle DB15 metal hood for HDTV, RGB+Sync cable.

2000 Calrad Lauches 58-2000 Brochure with over 60 new products.

1999 Calrad developes cables & connectors for HDTV markets.

1999 Calrad developes Auto Switching A\V RF modulator.

1997 Calrad developes SVHS to Composite video converter, 5 different models.

1967 Keyboards are put in use to provide data input for computers.
1963 The cassette deck for recording and playing back sound is introduced by phillips of the netherlands.
1962 Telstar, the first active communications satellite, is launched on july 10; it relays the first trans-Atlantic television pictures.
1957 The first Xerox copier is introduced.
1956 The Lip company in france produces the first commercial watch to run on electronic batteries.
1955 The first optical fibers are produced by Narinder Kapary in london.
1954 Bell Telephone scientists Chaplin, Fuller and Peterson develops the photovoltaic cell, which can produce electric power from sunlight.
1952 The first commercial product using transistos instead of vacuum tubes is introduced; it is a hearing aid.
1951 John Williams and John Prosper Eckert build UNIVAC I, the first electronic computer to be commercially available and the first to store data on a magnetic tape.
1948 After a walk in the woods with his dog, swiss engineer george demestral steals an idea from the cockleburs in his socks and the dogs coat and invents Velcro.

1947 The first microwave cooker goes on sale in the united states.

1944 The second electronic digital computer, the Automatic Sequenced Controlled Calculator or mark I, is completed by (Howard Aiken) and a team of engineers from IBM, it uses punched paper tape for programming and vaccum tubes to calculate problems, but breaks down frequently from problems with the vacuum tubes.

1941 German Scientist (Konrad Zuse's) , Z2 computer is the first to use electromagnetic relays and a punced tape for data entry.

1940 (Peter Carl Goldmark) the first color television broadcast is made using his system.
1938 (Konald Zuse) invents and completes the Z1, a binary calculating machine.
1938 (George Harold Brown) developes the vestigial sideband filter for use in television transmitters, doubling the horizontal resolution of television pictures at any given bandwidth.
1937 (John V. Atanasoff) Starts work on the first electronic computer, a machine for solving systems of linear equations; the first operational prototype is completed in october, 1939, and an operational version know as the ABC which fails frequently because of problems with the punched-card input, it is redesigned and working by 1942.
1936 (George Harold Brown) invents the turnstile antena for television broadcasting.
1936 Fluorescent lighting is introduced.
1933 American engineer (Edwin H. Armstrong) perfects Fm (frequency modulation) radio.
1932 RCA demonstrates a television receiver with a cathode-ray tube.
1930 The tape recorder using magnetized plastic tape is developed in germany.
1929 FM radio is introduced.
1927 (Harold Stephen Block) introduces negative feedback in audio amplifiers, thus reducing distortion.
1927 The pentode, a vacuum tube with five electrodes, is introduced.
1925 (Vladimir Zworykin) files for a patent on a color television system; the patent is granted in 1928.
1921 RCA demonstrates a television receiver with a cathode-ray picture tube (CRT).
1921 The first photoelectric cell is produced.
1921 (Albert W. Hull) invents the magnetron, an electron tube that produces microwaves.
1919 Shortwave radio is developed.
1918 The Radio crystal oscillator is introduced.
1915 The radio tube oscillator is introduced.
1915 American physicist (Manson Benedicks) discovers that a germanium crystal can convert AC current to DC, a discovery that leads to the development of the "chip".
1913 The cascade-tuning radio receiver and the heterodyne radio receiver are introduced.
1913 Meissner invents a radio transmitter with vacum tubes.
1904 Ultraviolet lamps are introduced.
1904 (John Ambrose Fleming) born lancaster England, Nov 29, 1849 files a patent for the first vacuum tube; it is a diode that acts as a rectifier, a device that makes current flow in a single direction instead of alternating back and forth; hence, it changes alternating current (AC) to direct current (DC).
1902 G. Honold develops high-voltage ignition for internal combustion engines based on electromagnetic induction.
1902 The radio magnetic detector is introduced.
1891 (Oliver Schallenberger) invents an electric meter for alternating current.
1891 (Nikola Tesla) invents the Tesla coil, which produces high voltage at high frequency.
1888 (Nikola Tesla) invents an alternating current induction motor.
1886 (Alexander Graham Bell) uses wax disks for recording sound with a modified version of edison's phonograph.
1885 William Stanley invents the electric transformer.
1884 Telephone wires connect boston to New York.
1884 The ammeter is introduced in electrical engineering.
1881 The first practical electric generator and electric distribution systems are built.
1880 (Alexander Graham Bell) patents the photophone; a phone circuit sets a mirror in vibration and reflected sun rays are detected by a selenium detector thus allowing the transmission of sound by light.
1877 The first commercial telephone exchange is started in New Haven, CT.
1876 (Alexander Graham Bell) born edinburgh, Scottland, March 3, 1847 patents the telephone.
1869 Belgian - French inventor Zenobe Theophile Gramme born Jehaybodegnee, Belgium April 4, 1826. He builds the first commercially practical generator for producing alternating current.
1866 (Cyrus West Field) born Stockbridge, MA, Nov 30, 1819 succeeds in laying a telegraph cable across the atlantic ocean.
1866 (Mahlon Loomis) born Oppenheim, Ny, July 21, 1826 sends telegraph messages over radio waves between two mountains in west virginia using aerials held in the air by kites.
1866 Engineer (Robert Whitehead) born January 3, 1823 invents the torpedo.
1866 German - American electrical engineer( Charles Proteas (Karl August) Steinmetz) born Breslau, Wroclaw Poland, April 9. His work on the theory of AC current is the foundation of today's electrical industry.
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