Practice Test Geeks(SBCA) Satellite Broadcasting and Communications Association Certification Practice Test
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System Troubleshooting & Maintenance Flashcards

7 cards from real SBCA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 System Troubleshooting & Maintenance flashcards as text

  1. A satellite receiver shows a signal strength of 85% but signal quality drops to 20% during rain. What is the most likely cause?

    Answer: Rain fade causing signal attenuation on Ku-band frequencies

    Rain fade is a well-known phenomenon where precipitation absorbs and scatters Ku-band signals, reducing signal quality even when the carrier is detected.

  2. When performing a spectrum analyzer sweep on a satellite transponder, you observe a raised noise floor across the entire bandwidth. What does this typically indicate?

    Answer: Uplink interference or transponder overload from excess carrier power

    A raised noise floor across a full transponder typically indicates uplink interference or an overdriven transponder from excess carrier power.

  3. A VSAT terminal suddenly loses two-way communication but can still receive broadcast channels. Which component is most likely faulty?

    Answer: The transmit BUC (Block Upconverter)

    Since receive functionality is intact, the transmit BUC is the most likely failed component preventing two-way communication.

  4. What does a C/N (Carrier-to-Noise) ratio measurement indicate in satellite link analysis?

    Answer: The ratio of carrier power to thermal noise power in the receiver bandwidth

    C/N ratio expresses how much stronger the desired carrier signal is compared to the thermal noise floor, directly impacting demodulation performance.

  5. During routine maintenance, a technician finds the dish elevation has drifted 2 degrees below the optimal setting. What is the most likely cause on a fixed mount?

    Answer: Thermal expansion and contraction cycles loosening mount bolts

    Thermal cycling causes metal mounting hardware to expand and contract, gradually loosening bolts and allowing dish position to drift.

  6. A headend operator notices BER (Bit Error Rate) increasing gradually over several weeks without any weather events. What should be checked first?

    Answer: LNB gain degradation or connector corrosion at the feedhorn

    Gradual BER degradation without weather correlation typically points to slow-onset issues like LNB aging, internal corrosion, or connector oxidation.

  7. What is the primary purpose of a satellite link budget calculation during troubleshooting?

    Answer: To calculate expected signal margins and identify where losses exceed design parameters

    A link budget analysis compares expected vs. actual signal levels at each stage, helping isolate where losses are exceeding design margins.