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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.
    
    http://www.angelfire.com/wv/liberator2/roif/roif.html
    
    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.
    
    http://www.angelfire.com/wv/liberator2/roif/p6_1_7.jpg
    
    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."
    
    http://www.angelfire.com/wv/liberator/roif/p3_2_1.jpg
    
    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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