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The Finding Aid of the Loyd C. Sigmon Papers 0063
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Collection Details
Table of contents What's This?
  • Conditions Governing Access
  • Conditions Governing Use
  • Preferred Citation
  • Immediate Source of Acquisition
  • Biographical note
  • Scope and Content
  • Related Archival Materials
  • Processing Information note

  • Title: Loyd C. Sigmon papers
    Identifier/Call Number: 0063
    Contributing Institution: Pepperdine University. Special Collections and University Archives.
    Language of Material: English
    Physical Description: 1.69 linear feet (2 boxes)
    Date (inclusive): 1945-2008
    Abstract: The collection contains materials created by or about Loyd C. Sigmon from 1945 to 2008. Items relate to his interest in radio broadcasting, the creation of SigAlert (a traffic and emergency alert system), and his inventions. Books, plaques, articles, newspaper clippings, biographical materials, blueprints, and notebooks, are found within the collection.
    Creator: Sigmon, Loyd C., 1909-2004

    Conditions Governing Access

    Advance notice required for access.

    Conditions Governing Use

    Permission to publish, quote, or reproduce must be secured from the repository and the copyright holder.

    Preferred Citation

    [Box/folder# or item name], Loyd C. Sigmon papers, Collection no. 0063, Special Collections and University Archives, University Libraries, Pepperdine University.

    Immediate Source of Acquisition

    Materials were transferred from University Advancement to the University Archives on March 16, 2010.

    Biographical note

    Loyd C. Sigmon was born in Stigler, Oklahoma on May 6, 1909 to a cattle-ranching family. He went to school at Wentworth Military Academy and Massachusetts Institute of Technology. He was interested in radio as a young man, and earned his his amateur radio license (W6LQ) at age 14. His broadcasting career began in 1932 at the Boston Short Wave and Television Laboratories. In 1941, he was hired as an engineer for MacMillan Petroleum Company's flagship radio station, KMPC, in Los Angeles, California.
    During World War II, he served in the United States Army Signal Corps as Officer in charge of Communications for the Supreme Allied Command in Europe. He came up with the idea for the SigCircus, a mobile radio broadcasting unit on a fleet of 17 trucks which was able to send and receive messages simultaneously from Europe and the United States.
    Sigmon resumed his job in Los Angeles after the war, and eventually became Executive Vice President at Gene Autry's Golden West Broadcasters. The company owned eight radio and two television stations on the west coast, including KMPC.
    In 1955, Sigmon invented a specialized radio and tape recorder that the Los Angeles Police Department used to alert radio stations throughout the city to traffic conditions and emergencies. The messages were referred to as "Sigmon traffic alerts," a phrase quickly shortened to "SigAlert." While originally intended for any emergency or traffic situation, the system is now mainly used for traffic alerts.
    Loyd Sigmon received recognition and honors from local and state government agencies, the National Safety Council, and broadcasting and radio organizations. He was a member of the University Board at Pepperdine University, and an office in the Center for Communication and Business is named after him. Sigmon died in Bartlesville, Oklahoma, on June 2, 2004.

    Scope and Content

    The collection contains materials created by or about Loyd C. Sigmon from 1945 to 2008. Items relate to his interest in radio broadcasting, the creation of SigAlert (a traffic and emergency alert system), and his inventions. Items include engineering books and books on Los Angeles traffic; plaques celebrating Sigmon; articles and newspaper clippings about Sigmon and/or SigAlert; biographical material; a radio station photo album; blueprints for electronic gates, home improvements, a police receiver, a Mark IV radio receiver, and circuits; and a blueprint map of trans-Atlantic cables, radio and circuits passing between Europe, England, the United States, and Iceland from 1945.

    Related Archival Materials

    Files related to the University Board can be found in the M. Norvel and Helen Young papers 0014, the Howard A. White papers 0010, and the William S. Banowsky papers 0002. Items are restricted for 50 years after their creation date.

    Processing Information note

    The collection was arranged and described by Jamie Henricks, Katie Richardson, and Lindsey Gant in February, 2013.

    Subjects and Indexing Terms

    KMPC (Radio station : Los Angeles, Calif.).
    Sigmon, Loyd C., 1909-2004
    Los Angeles (Calif.)--History
    Receipts (financial records)