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    Re: Early Air Navigation with RDF
    From: Paul Hirose
    Date: 2019 Apr 17, 12:33 -0700

    On 2019-04-17 7:46, Ed Popko wrote:
    > I have read that Amelia Earhart was the first civilian pilot to try (and she 
    failed) Bendix RDF equipment on her ill fated flight.  I have also heard that 
    air navigators within the US were issued small directories of the 
    latitude/longitude of powerful AM radio stations, mostly major cities, as an 
    aid to navigation.
    This WW2 U.S. Army Air Forces document, "Radio Operators' Information
    File," may have some clues.
    In the chapter on the radio direction finder, page 1-7 describes a
    couple Army technical orders with listings of radio range stations and
    broadcast stations.
    Speaking of Earhart, I believe the Coast Guard ship Itasca clearly heard
    her transmitting on 3105 or 6210 kHz. Well, the chapter on the CAA
    (predecessor to today's FAA) says, "CCA [sic] stations guard 6210, 3105,
    and 4495 kc."
    I had not realized those frequencies were continuously monitored.
    Apparently nobody except Itasca heard Earhart that day, though
    *allegedly* several people in the U.S. (but apparently not the CAA)
    heard distress calls from Earhart on subsequent days.

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