SBCA Signal Distribution 3 — Questions and Answers
Question 1: What is the effect of a sharp bend in a coaxial cable on signal distribution?
- It improves signal quality by reducing interference
- It has no effect on signal quality
- It can cause impedance mismatch and signal loss (Correct answer)
- It increases the cable's bandwidth
Correct answer: It can cause impedance mismatch and signal loss
Sharp bends in coaxial cable can deform the dielectric and alter the cable's geometry, causing impedance mismatches and increased signal loss.
Question 2: In satellite distribution systems, what does the term 'cascade loss' refer to?
- Signal loss caused by water infiltration
- Cumulative signal loss through multiple passive components (Correct answer)
- Loss due to incorrect polarization
- Frequency drift in distribution equipment
Correct answer: Cumulative signal loss through multiple passive components
Cascade loss refers to the cumulative signal attenuation that occurs as a signal passes through multiple passive distribution components like splitters and cables.
Question 3: Which distribution component has the LEAST insertion loss?
- 2-way splitter (Correct answer)
- 4-way splitter
- 8-way splitter
- Directional coupler with high coupling value
Correct answer: 2-way splitter
A 2-way splitter typically has the lowest insertion loss (~3.5 dB) compared to higher-way splitters which divide the signal among more outputs.
Question 4: What is a 'standing wave' in a coaxial cable distribution system?
- A static electricity buildup on the cable surface
- A pattern of voltage and current variations caused by signal reflections (Correct answer)
- A thermal expansion effect at high signal levels
- A constant DC voltage superimposed on RF signals
Correct answer: A pattern of voltage and current variations caused by signal reflections
Standing waves result from signal reflections due to impedance mismatches, creating a stationary pattern of voltage and current variations along the cable.
Question 5: Why is it important to use weatherproof connectors on outdoor satellite signal distribution runs?
- Outdoor connectors have lower insertion loss
- Moisture ingress causes oxidation and increased signal attenuation (Correct answer)
- Outdoor connectors provide better shielding from solar interference
- UV exposure increases signal frequency
Correct answer: Moisture ingress causes oxidation and increased signal attenuation
Moisture ingress into connectors causes oxidation and corrosion, which significantly increases signal attenuation and can cause complete signal failure.
Question 6: In a whole-home satellite distribution system, what is the advantage of using a centralized distribution point?
- It eliminates the need for amplifiers
- It allows easier troubleshooting and signal level management (Correct answer)
- It reduces the number of cables needed
- It automatically adjusts for weather-related signal loss
Correct answer: It allows easier troubleshooting and signal level management
A centralized distribution point allows technicians to easily measure and adjust signal levels from a single location, simplifying troubleshooting and maintenance.
Question 7: What problem does a 'return path' filter solve in a satellite distribution system connected to a cable plant?
- It prevents satellite signals from entering the cable network
- It blocks upstream noise from cable modems from entering the satellite system (Correct answer)
- It filters out rain-fade frequencies
- It removes DC voltage from the coaxial cable
Correct answer: It blocks upstream noise from cable modems from entering the satellite system
A return path filter blocks upstream noise generated by cable modems and other return-path devices from entering and degrading the satellite signal distribution system.
SBCA Signal Distribution 3
What is the effect of a sharp bend in a coaxial cable on signal distribution?