They probably ditched the transceiver because it weighed 40-60lbs, which is a lot of extra weight for something that you don't need, based upon "success oriented" planning.
(The linked article says Earhart didn't know enough about radio, either to convert from wavelength to frequency, or to match an antenna to the transmitter. Such knowledge was probably rare in 1937.)
(The linked article says Earhart didn't know enough about radio, either to convert from wavelength to frequency, or to match an antenna to the transmitter. Such knowledge was probably rare in 1937.)