radiotelegraphy

1. "With minor changes, this code has remained in use for certain types of radiotelegraphy, including amateur radio." An they were able to keep in daily touch with each other over the air.
   除一些小变动外，这种电码一直用于某些种类的无线电报，包括业余无线电。他们两人都是业余无线电爱好者，所以他们日常能用无线电来互相联系。

noun

1. the use of radio to send telegraphic messages (usually by Morse code)

   Synonym:    radiotelegraphwireless telegraphwireless telegraphy

2. telegraphy that uses transmission by radio rather than by wire

   Synonym:    radiotelegraphwireless telegraphy