8-E-39: Antenna Systems
8-39E1:
Slotted waveguide arrays, when fed from one end exhibit:
Frequency scan.
High VSWR.
Poor performance in rain.
A narrow elevation beam.
8-39E2:
A typical shipboard RADAR antenna is a:
Slotted waveguide array.
Rotary parabolic transducer.
Phased planar array.
Dipole.
8-39E3:
Good bearing resolution largely depends upon:
A narrow antenna beam in the horizontal plane.
A high transmitter output reading.
A high duty cycle.
A narrow antenna beam in the vertical plane.
8-39E4:
The center of the transmitted lobe from a slotted waveguide array is:
Several degrees offset from a line perpendicular to the antenna.
Perpendicular to the antenna.
Maximum at the right hand end.
Maximum at the left hand end.
8-39E5:
How does antenna length affect the horizontal beamwidth of the transmitted signal?
The longer the antenna the narrower the horizontal beamwidth.
The longer the antenna the wider the horizontal beamwidth.
The horizontal beamwidth is not affected by the antenna length.
None of the above.
8-39E6:
What is the most common type of RADAR antenna used aboard commercial maritime vessels?
Slotted waveguide array.
Parabolic.
Truncated parabolic.
Multi-element Yagi array.
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