What technique is used to ensure that voice messages containing unusual words are received correctly?
Send the words by voice and Morse code
Use the Q-code “QSR” to ask the receiving station to repeat the words back
Spell the words using a standard phonetic alphabet✓Bonne réponse
All these choices are correct
Explication
Spelling unusual words with a standard phonetic alphabet removes the ambiguity between letters that sound alike over a noisy channel. Sending them twice in different modes or inventing a Q signal is not standard practice.