I found this resource whilst exploring some information on oral history of Pacific Islands. Specifically it has a transcript of an interview with Victor BS Kim (among others), who was the amateur radio operator on Jarvis Island during the time of Amelia's disappearance. Interviews
It's a fairly large pdf document and his interview begins at page 57.
I listed this under Radio Reflections because he answered several specific questions about what his duties were as the radio operator, how he was selected and how the radio was specifically used during the time on the island. He emphasizes that he used radio to make two regular contacts a day and was concerned that any further use would exceed the battery power available. Not exactly plowing any new ground but seems a good read for backround to understand what the radio operators had to deal with in this environment.