2-23. When would a counterpoise be used?
- When easy access to the antenna base is necessary
- When the surface below is solid rock
- When the surface below is sandy ground
- All the above
2-24. Capacitive top-loading helps to increase which of the following antenna characteristics?
- Bandwidth
- Power-handling
- Directivity
- Radiation efficiency
2-25. What is the most limiting characteristic of the Yagi antenna?
- Power-handling
- Narrow bandwidth
- Physical size
- Lack of directivity
2-26. In general, log-periodic antennas have which of the following characteristics?
- Medium power handling capabilities
- High gain
- Extremely broad bandwidth
- All the above
2-27. A typical vertical monopole log periodic antenna designed to cover a frequency range of 2 to 30 MHz will require approximately how many acres of land for its ground plane system?
- 1 acre
- 2 acres
- 3 acres
- 4 acres
2-28. A sector log-periodic array can act as an antenna for a minimum of what number of transmit or receive systems?
- 1
- 2
- 3
- 4
2-29. The most distinct advantage of the rotatable log-periodic antenna is its ability to perform what function?
- Rotate 360 degrees
- Rotate from horizontal to vertical and back
- Ability to handle high transmitter power
- Ability to produce high antenna gain
2-30. What is the average power handling capability of an Inverted Cone antenna?
- 20 kw
- 30 kw
- 40 kw
- 50 kw
2-31. What determines the gain and directivity of a Rhombic antenna?
- Transmitter power
- Antenna height
- Radiated wave interaction
- Transmitted frequency
2-32. Most Whip antennas require some kind of a tuning system to improve bandwidth and power handling capabilities.
- T
- F
Why are UHF and. VHF antennas on board ship installed as high as possible?
- To prevent radiation hazard to personnel
- To prevent radiation hazard to ordinance
- To increase power handling capabilities
- To prevent unwanted directivity in the radiation pattern from mast structures
2-34. The central feed section for both the biconical and center-fed dipole are protected by what type of covering?
- SCOTCHCOAT
- RTV
- Laminated fiberglass
- Rubber shield
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