NZART Amateur Examination                     page 9          NZARTX07 Security code 270029

  1. To lower the resonant frequency of an antenna, the operator should:
    1. lengthen the antenna
    2. centre feed the antenna with TV ribbon
    3. shorten the antenna
    4. ground one end

  2. A Yagi antenna is said to have a power gain over a dipole antenna for the same frequency band because:
    1. it radiates more power than a dipole
    2. more powerful transmitters can use it
    3. it concentrates the radiation in one direction
    4. it can be used for more than one band

  3. Because of high absorption levels at frequencies below 4 MHz during daylight hours, only high angle signals are normally reflected back by this layer:
    1. C
    2. D
    3. E
    4. F

  4. One of the ionospheric layers splits into two parts during the day called:
    1. A & B
    2. D1 & D2
    3. E1 & E2
    4. F1 & F2

  5. The distance from the transmitter to the nearest point where the sky wave returns to the earth is called the:
    1. angle of radiation
    2. maximum usable frequency
    3. skip distance
    4. skip zone

  6. If the frequency of a transmitted signal is so high that we no longer receive a reflection from the ionosphere, the signal frequency is above the:
    1. speed of light
    2. sun spot frequency
    3. skip distance
    4. maximum usable frequency

  7. Reception of high frequency radio waves beyond 4000 km normally occurs by the:
    1. ground wave
    2. skip wave
    3. surface wave
    4. sky wave
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