TIGHAR
Amelia Earhart Search Forum => Radio Reflections => Topic started by: Craig Romig on September 06, 2015, 02:01:21 AM
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What distance would Earhart have to be to lose contact with the Itasca?
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What distance would Earhart have to be to lose contact with the Itasca?
The propagation of radio transmissions (http://tighar.org/wiki/Radio_propagation) depends on a lot of factors.
Which frequency (http://tighar.org/wiki/Frequency,_wavelength,_and_antenna_tuning)?
On which antenna (http://tighar.org/wiki/Antennas)?
Under what solar conditions (https://en.wikipedia.org/wiki/Solar_flare)?
Under what climate conditions (https://en.wikipedia.org/wiki/Ionosphere)?
At what altitude (http://tighar.org/Projects/Earhart/Archives/Documents/Kelly_Johnson.html)?
The fact is that she was in "contact" with the Itasca from 1410 GMT until 2013 GMT. If her normal cruise speed was 150 mph (http://tighar.org/wiki/Lockheed_Electra_10E_Special_-_NR16020#Normal_cruise_speed), that means that under some conditions she could be heard about 900 miles away from the Itasca.
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She seemed to have lost contact after she switched to her 6210 freq. In the weather conditions and how high etc she was probably flying how far would she have been from them.
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She seemed to have lost contact after she switched to her 6210 freq. In the weather conditions and how high etc she was probably flying how far would she have been from them.
Nobody knows.
Nobody can know.
It is a simple question.
It does not have a simple answer.
It depends on too many variables about which we have practically no information.