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E8D11

SIGNALS AND EMISSIONS · Keying defects and overmodulation of digital signals; digital codes; spread spectrum

E8D11E8D →

What is one advantage of using ASCII code for data communications?

  1. AIt includes built-in error correction features
  2. BIt contains fewer information bits per character than any other code
  3. CIt is possible to transmit both uppercase and lowercase text
  4. DIt uses one character as a shift code to send numeric and special characters
Why ASCII is a 7-bit code giving 128 distinct characters, enough room for the full uppercase and lowercase alphabets plus digits, punctuation and control codes. That is its main advantage over the older 5-bit Baudot/ITA2 code used in classic RTTY, which only has 32 combinations and therefore sends uppercase letters only.
Watch out The shift-code answer describes Baudot, which needs LTRS and FIGS shift characters to reach numbers and symbols; and ASCII is a larger code with no built-in error correction, so both of those choices apply to something else.
ASCII = 7 bits, 128 characters, so it has room for lowercase. Baudot = 5 bits and needs shift codes.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
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The rest of E8D

  1. E8D01 Why are received spread spectrum signals resistant to interference?
  2. E8D02 What spread spectrum communications technique uses a high-speed binary bit stream to shift the phase of an RF…
  3. E8D03 Which describes spread spectrum frequency hopping?
  4. E8D04 What is the primary effect of extremely short rise or fall time on a CW signal?
  5. E8D05 What is the most common method of reducing key clicks?
  6. E8D06 What is the advantage of including parity bits in ASCII characters?
  7. E8D07 What is a common cause of overmodulation of AFSK signals?
  8. E8D08 What parameter evaluates distortion of an AFSK signal caused by excessive input audio levels?
  9. E8D09 What is considered an acceptable maximum IMD level for an idling PSK signal?
  10. E8D10 What are some of the differences between the Baudot digital code and ASCII?
  11. E8D11 What is one advantage of using ASCII code for data communications?
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