It seems to me that there various kinds of radio stations on Niku at different times. I think it would be hard to eliminate all of them as possible sources of the connector.
From
“Nikumaroro” by P. B. Laxton:"They rose before dawn each day, and after the early light meal, went out under the leadership of Tem Mautake to the bush for clearing and planting. Gallagher would make his radio schedule, deal with the little office work, and follow the working parties with the native leader and acting Magistrate, Teng Koata and with his personal “boy,” young Ten Aram Tamia, a Gilbertese educated under Major Holland, G.C., at the Colony’s King George V school at Tarawa."
"The terrific impact of German and Japanese aggression and global war threw Nikumaroro into the background, and no resident officer replaced Mr. Gallagher. In 1943, however, a survey party came, and thereafter a radio navigation station was set up by the United States Forces."
"The acting Island Magistrate was that same Aram Tamia who had accompanied Gallagher as his houseboy. Next day I set out with him on a tour of inspection. A hundred yards from the house to the north was the radio station, under charge of Ten (or Mr.) Tekautu, a skillful, English-speaking, Gilbertese wireless operator. He kept a daily “Met. log” which he transmitted to Canton Island, making also two other daily schedules for official business and private telegrams. His equipment, old and needing replacement, was well and intelligently maintained. Tekautu was unmarried and a little lonely, since he was not a Nikumaroro man."