NWSA - National Wireless Safety Alliance Antenna and Line Installation Questions and Answers

Question 1

When hoisting a 300-foot coaxial cable run, what is the minimum number of hoisting grips required according to industry best practices?

Accepted Answer

Two, one at the top and one in the middle

Answer

Industry standards recommend using hoisting grips at intervals of no more than 200 feet (60 m). For a 300-foot run, one grip is needed at the top to lift the cable, and an additional grip is required along the span to properly distribute the load and prevent damage to the cable.

Question 2

A tower technician is tasked with weatherproofing a newly installed N-type connector on an antenna jumper. Which of the following describes the proper layering sequence for maximum protection?

Accepted Answer

A primary wrap of butyl rubber tape followed by an outer wrap of UV-resistant electrical tape.

Answer

The industry-standard method for weatherproofing RF connectors involves a two-stage process. First, a layer of butyl rubber (or similar self-fusing/mastic) tape is stretched and wrapped to create a watertight seal. This is followed by a protective outer layer of high-quality, UV-resistant electrical tape to shield the butyl from sunlight and physical abrasion.

Question 3

During an antenna installation, which of the following practices is most likely to introduce Passive Intermodulation (PIM)?

Accepted Answer

Using stainless steel hose clamps to secure cables near an antenna.

Answer

Passive Intermodulation (PIM) is caused by nonlinear junctions of dissimilar metals in the RF path. Standard stainless steel hose clamps, snap-in hangers, and other non-PIM-rated metal hardware are common sources of PIM, especially when installed in the high-RF environment near an antenna. Low-PIM hardware, proper torque, and clean connections are all methods to mitigate PIM.

Question 4

A crew is preparing to install new panel antennas on a sector frame. The construction drawings specify an antenna centerline elevation and a mechanical tilt of 4 degrees. What must the crew verify before finalizing the antenna position?

Accepted Answer

That the antenna mount itself is installed plumb (perfectly vertical).

Answer

For the specified mechanical downtilt to be accurate relative to the horizon, the antenna mount must first be installed perfectly plumb (vertical). If the mount is not plumb, the resulting tilt and azimuth of the antenna will be incorrect, impacting the sector's coverage as designed.

Question 5

When installing a new transmission line, which of the following is a critical step for preventing water from entering the building or equipment shelter at the cable entry point?

Accepted Answer

Creating a drip loop in the cable before it enters the port.

Answer

A drip loop is a U-shaped bend in the cable just before it enters a wall penetration or equipment port. This loop ensures that any water running down the cable's outer jacket will drip off at the bottom of the loop instead of following the cable into the entry point, thus preventing water intrusion.

NWSA - National Wireless Safety Alliance Practice Test

NWSA - National Wireless Safety Alliance Practice Test

NWSA - National Wireless Safety Alliance Antenna and Line Installation Questions and Answers