I thought there was only a receiver radio in all of the planes besides the flight lead's... or were those German craft?
I don't know maybe somebody will answer the question.
Per John Toland's book, "The Rising Sun, The Decline and Fall of the Japanese Empire," the fighters at Pearl Harbor did not have radios. Fuchida in a bomber fired flares to signal the fighters.
Bombers had radios. Early fighters didn't.
Wouldn't the radios be stripped prior to launch?