SBCA Installation Practices & Standards 5

Question 1

What is the correct polarity of DC voltage applied over coax to power an LNB and select vertical polarization on a linear polarization system?

Accepted Answer

13V DC

Answer

13V DC applied over the coaxial cable selects vertical polarization on a linear LNB, while 18V selects horizontal polarization.

Question 2

When installing a satellite dish in a high-wind coastal area, which mounting configuration provides the greatest structural stability?

Accepted Answer

Ground-mounted concrete base with embedded pole

Answer

A concrete-embedded ground mount provides the most rigid, wind-resistant foundation and is preferred in high-wind or coastal environments.

Question 3

According to FCC regulations, who is responsible for ensuring that a satellite receiving system does not cause interference to other users?

Accepted Answer

The installation technician and system owner

Answer

FCC Part 25 places responsibility on the licensee/system owner and, by extension, the installation technician to ensure the system operates within regulatory parameters.

Question 4

What is the maximum distance a ground rod electrode can be from the building entry point for the grounding conductor to remain compliant under NEC 810?

Accepted Answer

The conductor must be as short and direct as possible with no stated maximum distance

Answer

NEC 810 requires that the grounding conductor be run as short and straight as practicable, but does not specify a maximum distance — minimizing conductor length is the goal.

Question 5

A customer reports intermittent satellite signal loss during rain. The dish alignment was verified to be correct. What is the most likely cause?

Accepted Answer

Rain fade affecting the satellite uplink or the signal path

Answer

Rain fade occurs when precipitation absorbs and scatters microwave signals in the path between the satellite and the dish, causing signal attenuation.

(SBCA) Satellite Broadcasting and Communications Association Certification Practice Test

(SBCA) Satellite Broadcasting and Communications Association Certification Practice Test

SBCA Installation Practices & Standards 5