Amateur Extra Class: 2020–2024
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E1D02:

[97.211(b)]

Which of the following may transmit special codes intended to obscure the meaning of messages?

  1. Telecommand signals from a space telecommand station
  2. Data containing personal information
  3. Auxiliary relay links carrying repeater audio
  4. Binary control characters
E1D01 E1D02 E1D03 E1D04 E1D05 E1D06 E1D07 E1D08 E1D09 E1D10 E1D11 E1D12