Question T8B12
From subelement T8 - T8B
Which of the following is a way to determine whether your satellite uplink power is neither too low nor too high?
Why is this correct?
The correct answer is C because comparing your downlink signal strength to the satellite beacon provides the most reliable power reference. The beacon transmits at a known, consistent power level, so matching its strength ensures you're using appropriate uplink power. Options A and B are unreliable - telemetry doesn't typically include individual signal reports, and distortion can occur from other factors. This beacon comparison method prevents both underpowering (weak signal) and overpowering (blocking other users via AGC activation).
Memory tip
Look for questions asking about satellite power control - the beacon is always your reference standard. Satellites use beacons as 'lighthouses' with known characteristics, making them perfect benchmarks. When you see power adjustment questions, think: 'What's my reliable reference point?' The beacon provides that consistency across all satellite operations.
Learn more
Satellite beacons serve as both navigational aids and power references, transmitting telemetry data including battery voltage, temperature, and spacecraft status at consistent power levels. In practical operation, this beacon comparison method prevents your signal from triggering the satellite's automatic gain control (AGC), which would set receive thresholds too high and block weaker stations. Professional satellite operators worldwide use this technique to maintain proper frequency coordination and ensure equitable access to transponder resources.
Think about it
Why do you think satellite designers chose to make beacon signals the power reference standard rather than having the satellite send individualized signal reports to each user?