Regarding the communication model, how can the use of the same code during radio communication be ensured?

Question

Question PPL(H) - Private Pilot License - Human Performance and limitations

QuizVDS · Accepted Answer

By the use of radio phraseology

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By a particular frequency allocation

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By using radios certified for aviation use only

QuizVDS · Answer

By the use of proper headsets

Id 356 - PPL(H) EN - Regarding the communication model, how can the use of the same code during radio communication be ensured?