Betty did not make a notation of what day she heard Amelia, but there is one clue in her transcript that suggests the date was Monday, July 5.
One of the first entries in Betty's notebook is "here put your ear to it" allegedly spoken by Amelia. She can only be speaking to Fred. Put your ear to what? Why? There must be something she wants Fred to put his ear to so that he can hear something. There must be a purpose to that request.
The only thing I can think of that he could put his ear to are the radio earphones and there must be something she wants him to hear that will serve a purpose. We know from the context of the transcripts that Fred is upset, almost panicky. Amelia has been calling for help. Any kind of response to her calls would be greatly reassuring. So, the question is, was there any day when someone was transmitting to Earhart shortly after 4:30pm St. Petersburg time (20:30 GMT/ 09:00 ITASCA time)?
According to the
Itasca Radio Log,
• As has been shown, Friday, July 2, is not a possibility.
• On Saturday, July 3, nobody tried to call Earhart during the time period in question.
• On Sunday, July 4, Chief Radioman Bellarts heard "not one signal" on 3105 at 09:00 but called Earhart in voice at 09:30. No response.
• On Monday, July 5, at 09:57 Chief Radioman Bellarts "hearing signal on 3105 / little low in frequency". At 10:00 and again five minutes later, Bellarts "called Earhart // 3105 key" (in other words, in Morse code). Earhart would not be able to understand the message but a response on her frequency would be an indication that her calls were being heard by someone.
• On Tuesday, July 6 through Friday, July 9, nobody tried to call Earhart during the time period in question.
So there were two days, Sunday the 4th and Monday the 5th, when Earhart could have heard something on her frequency (3105) during the time Betty heard her say "here put your ear to it." According to Betty, her father came home from work during the time she was hearing Amelia and her recollection was that her father did not work on Sundays, so Monday, July 5th is the date that best fits.