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