NZART Amateur Examination                     page 8          NZARTX07 Security code 268509

  1. "Break-in keying" means:
    1. unauthorised entry has resulted in station equipment disappearing
    2. temporary emergency operating
    3. key-down changes the station to transmit, key-up to receive
    4. the other station's keying is erratic

  2. The purpose of a VOX unit in a transceiver is to:
    1. change from receiving to transmitting using the sound of the operator's voice
    2. check the transmitting frequency using the voice operated crystal
    3. enable a volume operated extension speaker for remote listening
    4. enable the variable oscillator crystal

  3. The signal "QRN" means:
    1. I am busy
    2. I am troubled by static
    3. are you troubled by static?
    4. I am being interfered with

  4. The designed output impedance of the antenna socket of most modern transmitters is nominally:
    1. 25 ohm
    2. 50 ohm
    3. 75 ohm
    4. 100 ohm

  5. This commonly available antenna feedline can be buried directly in the ground for some distance without adverse effects:
    1. 75 ohm twinlead
    2. 300 ohm twinlead
    3. 600 ohm open-wire
    4. coaxial cable

  6. The antenna in this diagram has two equal lengths of wire shown as 'X' forming a dipole between insulators. The optimum operating frequency will be when the:
    1. length X+X equals the signal wavelength
    2. dimensions are changed with one leg doubled in length
    3. length X+X is a little shorter than one-half of the signal wavelength
    4. antenna has one end grounded

  7. The purpose of a balun in a transmitting antenna system is to:
    1. balance harmonic radiation
    2. reduce unbalanced standing waves
    3. protect the antenna system from lightning strikes
    4. match unbalanced and balanced transmission lines
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