There is at least one situation per Elric brother, when they have fixed radio device - e.g. Edward fixed transmitter sg. Fuery was working on, and Alphonse fixed broken radio in Reole (Liore?).
One of the principles of the alchemy is that if you want to create some thing, you should know how it works. Which leads me to conclusion, that both Elric brothers should have some education in terms of electronic devices, and radio technology.
Is there any additional information on this in anime/manga etc?