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The international convention stated that each station should have a unique call sign because … both ship and land practiced to begin their messages with short identifiers

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The international convention stated that each station should have a unique call sign because …

  1. both ship and land practiced to begin their messages with short identifiers.
  2. sometimes users chose call signs that had already been chosen.
  3. radio was used as a wireless telegraph.
  4. it was necessary to shorten the number of dots and dashes needed to identify each station.


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