Shortwave development continues. Over the next 10 years, dozens of Arctic and Antarctic expeditions, including those of Commander Byrd, used amateur radio as their primary communications. Spark prohibited on the new bands. Broadcast band expanded. The ARRL adopted Esperanto as the international auxiliary language.
Amateurs finally are successful in working around the world on shortwave.
A Federal Court declared the Radio Act of 1912 to be unenforceable in regards to broadcasting and the shortwaves. The International Radiotelegraph Conference is held in Washington. 70 Nations send representatives. International callsign prefixes are assigned. Phone operation begins to appear on some HF bands.