NEETS 17.txt

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bc901
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286905
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NEETS 17.txt
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2014-10-24 01:29:27
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  1. The usual range of radiotelephone is from ___ to ___ miles.
    20, 25
  2. Successful transmission of hf signals over a long distance is dependent upon refraction of radio waves by layers of the ___________.
    ionosphere
  3. Frequencies above ___ megahertz are not normally refracted by the atmosphere and ground-wave range is minimal.
  4. 30
  5. The __________ mode uses a single channel or frequency to exchange information between two or more terminals. Communications is in one direction only.
    simplex (splx)
  6. The _________ mode has one-way flow of information between terminals.
    half-duplex (hdx
  7. The ______________uses an arrangement of equipment where one terminal is simplex configured and the other uses two channels or frequencies in full duplex.
    semiduplex (sdx)
  8. The ________ mode is a method of operation in which telecommunications between stations takes place simultaneously in both directions using two separate frequencies
    full-duplex (fdx)
  9. __________ is the type of operation in which one station transmits information on one or more channels directed to more than one station and/or unit
    Broadcast (bc)
  10. _______ occurs when a transmitted electromagnetic wave passes through the receiver antenna and
  11. induces a voltage in the antenna.
  12. Reception
  13. _________ is the ability of the receiver to select a particular frequency of a station from all other station frequencies appearing at the antenna of the receiver.
  14. Selection
  15. __________ is the action of separating the low (audio) frequency intelligence from the high (radio) frequency carrier. A detector circuit is used to accomplish this action.
  16. Detection
  17. _________ is the action of converting the electrical signals to sound waves, which can then be interpreted by your ear as speech, music, and the like.
    Reproduction
  18. The ability of a receiver to reproduce weak signals is a function of the __________ of a receiver
    sensitivity
  19. __________ is the degree of distinction made by the receiver between the desired signal and unwanted signals
  20. Selectivity
  21. The ________ of a receiver is its ability to accurately reproduce, in its output, the signal that appears at its input.
  22. fidelity
  23. A typical value of IF for an AM communications receiver is _____ kilohertz
    455
  24. The overwhelming danger to date appears to be the hazard from thermal effects, which are a function of intensity of radiation and frequency. This is particularly true in the range of ___ to __ gigahertz.
    1, 3
  25. The distance of one hop for a line-of-sight system is between _____ and ____miles.
    31, 95
  26. HF has a hop distance (skywave) of about ________miles;
    1,400

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