The data that I have found on the construction is now available on the wiki.
Thanks, that was very useful. We lose sight that the planning and the runways were for the flight to proceed from Howland to Lae. So there were 29 drums of aviation fuel on the island, enough to get all the way to Lae.
The runway lengths were planned for a heavy weight takeoff, the light takeoff to Hawaii should have been much easier and well within the existing runways.
The runways were completed in March so no reason for there to be radiograms to Earhart in Lae since she was informed in person while she was in the States.
The portable radiophone had a standard marine frequency of 2670 kcs, it is still a standard marine frequency.
gl