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    Re: Amelia Earhart Report
    From: Gary LaPook
    Date: 2011 Mar 3, 15:51 -0800

    Various radio experts have examined her radio setup, especially the matching circuits and the length of the antenna which was too short (due to limitations caused by the size of the plane) to match 3105 khz. Due to this mismatch the actually power transmitted by the antenna was between 0.5 and 1.6 watts. We also know that Lae was able to hear her at 0718 Z, seven hours and eighteen minutes after takeoff, when she gave a position report of 4� 33' south, 159� 07' east, placing her about 750 NM from Lae and about 250 NM past the location of the recent "find". But this was on her daytime frequency of 6210 khz and the antenna was much more efficient on that frequency. She made another report, this time on 3105 khz at 1030 Z placing them about 1200 NM from Lae, and even further past the "find". This transmission was not heard by either Lae or by the Itasca but was heard on the nearby island of Nauru. Itasca heard her for the first time at 1515 Z on 3105 khz when the plane would have been at least 400 NM from Itasca so we know the radio can get that far at night on 3105 khz even with the inefficient antenna.
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