79 lines
3.7 KiB
Markdown
79 lines
3.7 KiB
Markdown
T0B – Antenna safety: tower safety and grounding, installing antennas, antenna supports
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- [[T0B01]] (C)
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Which of the following is good practice when installing ground wires on a tower for lightning protection? #card
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- A. Put a drip loop in the ground connection to prevent water damage to the ground system
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- B. Make sure all ground wire bends are right angles
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- C. Ensure that connections are short and direct
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- D. All these choices are correct
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- [[T0B02]] (D)
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What is required when climbing an antenna tower? #card
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- A. Have sufficient training on safe tower climbing techniques
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- B. Use appropriate tie-off to the tower at all times
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- C. Always wear an approved climbing harness
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- D. All these choices are correct
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- [[T0B03]] (D)
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Under what circumstances is it safe to climb a tower without a helper or observer? #card
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- A. When no electrical work is being performed
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- B. When no mechanical work is being performed
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- C. When the work being done is not more than 20 feet above the ground
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- D. Never
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- [[T0B04]] (C)
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Which of the following is an important safety precaution to observe when putting up an antenna tower? #card
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- A. Wear a ground strap connected to your wrist at all times
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- B. Insulate the base of the tower to avoid lightning strikes
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- C. Look for and stay clear of any overhead electrical wires
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- D. All these choices are correct
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- [[T0B05]] (B)
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What is the purpose of a safety wire through a turnbuckle used to tension guy lines? #card
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- A. Secure the guy line if the turnbuckle breaks
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- B. Prevent loosening of the turnbuckle from vibration
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- C. Provide a ground path for lightning strikes
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- D. Provide an ability to measure for proper tensioning
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- [[T0B06]] (D)
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What is the minimum safe distance from a power line to allow when installing an antenna? #card
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- A. Add the height of the antenna to the height of the power line and multiply by a factor of 1.5
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- B. The height of the power line above ground
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- C. 1/2 wavelength at the operating frequency
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- D. Enough so that if the antenna falls, no part of it can come closer than 10 feet to the power wires
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- [[T0B07]] (C)
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Which of the following is an important safety rule to remember when using a crank-up tower? #card
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- A. This type of tower must never be painted
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- B. This type of tower must never be grounded
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- C. This type of tower must not be climbed unless it is retracted, or mechanical safety locking devices have been installed
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- D. All these choices are correct
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- [[T0B08]] (D)
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Which is a proper grounding method for a tower? #card
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- A. A single four-foot ground rod, driven into the ground no more than 12 inches from the base
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- B. A ferrite-core RF choke connected between the tower and ground
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- C. A connection between the tower base and a cold water pipe
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- D. Separate eight-foot ground rods for each tower leg, bonded to the tower and each other
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- [[T0B09]] (C)
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Why should you avoid attaching an antenna to a utility pole? #card
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- A. The antenna will not work properly because of induced voltages
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- B. The 60 Hz radiations from the feed line may increase the SWR
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- C. The antenna could contact high-voltage power lines
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- D. All these choices are correct
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- [[T0B10]] (C)
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Which of the following is true when installing grounding conductors used for lightning protection? #card
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- A. Use only non-insulated wire
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- B. Wires must be carefully routed with precise right-angle bends
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- C. Sharp bends must be avoided
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- D. Common grounds must be avoided
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- [[T0B11]] (B)
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Which of the following establishes grounding requirements for an amateur radio tower or antenna? #card
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- A. FCC Part 97 rules
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- B. Local electrical codes
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- C. FAA tower lighting regulations
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- D. UL recommended practices
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