What is a link budget?
The correct answer is C: The sum of transmit power and antenna gains minus system losses as seen at the receiver. What a link budget is the sum of transmit power and antenna gains minus system losses as seen at the receiver. Link budget calculates the total signal power available at the receiver. For amateur radio operators, this helps predict communication range. Understanding this helps when planning radio links.
Exam Tip
Link budget = sum of transmit power and antenna gains minus system losses. Think 'L'ink 'B'udget = 'L'ooks at 'B'oth ends (transmit + receive) minus losses. Calculates total signal power available at receiver. Not financial costs, not just gains-losses, not power-sensitivity difference - just power+gains-losses.
Memory Aid
"Link budget = sum of transmit power and antenna gains minus system losses. Think 'L'ink 'B'udget = 'L'ooks at 'B'oth ends. Calculates total signal power available at receiver. Helps predict communication range."
Real-World Application
A link budget: Transmit power = 100W, transmit antenna gain = 10 dBi, receive antenna gain = 10 dBi, system losses = 3 dB. Link budget = 100W + 10 dBi + 10 dBi - 3 dB = total signal power at receiver. This helps predict if communication will work. Link budget is the sum of power and gains minus losses.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Link budget isn't financial costs - it's a technical calculation of signal power, not money. Financial costs aren't link budget.
Option B: Incorrect. Link budget isn't just antenna gains minus losses - it includes transmit power too. Transmit power is part of link budget.
Option D: Incorrect. Link budget isn't the difference between transmit power and receiver sensitivity - it's the sum of power and gains minus losses. Difference isn't the calculation.
题目解析
The correct answer is C: The sum of transmit power and antenna gains minus system losses as seen at the receiver. What a link budget is the sum of transmit power and antenna gains minus system losses as seen at the receiver. Link budget calculates the total signal power available at the receiver. For amateur radio operators, this helps predict communication range. Understanding this helps when planning radio links.
考试技巧
Link budget = sum of transmit power and antenna gains minus system losses. Think 'L'ink 'B'udget = 'L'ooks at 'B'oth ends (transmit + receive) minus losses. Calculates total signal power available at receiver. Not financial costs, not just gains-losses, not power-sensitivity difference - just power+gains-losses.
记忆口诀
Link budget = sum of transmit power and antenna gains minus system losses. Think 'L'ink 'B'udget = 'L'ooks at 'B'oth ends. Calculates total signal power available at receiver. Helps predict communication range.
实际应用示例
A link budget: Transmit power = 100W, transmit antenna gain = 10 dBi, receive antenna gain = 10 dBi, system losses = 3 dB. Link budget = 100W + 10 dBi + 10 dBi - 3 dB = total signal power at receiver. This helps predict if communication will work. Link budget is the sum of power and gains minus losses.
错误选项分析
Option A: Incorrect. Link budget isn't financial costs - it's a technical calculation of signal power, not money. Financial costs aren't link budget. Option B: Incorrect. Link budget isn't just antenna gains minus losses - it includes transmit power too. Transmit power is part of link budget. Option D: Incorrect. Link budget isn't the difference between transmit power and receiver sensitivity - it's the sum of power and gains minus losses. Difference isn't the calculation.
知识点
Link budget, Transmit power, Antenna gains, System losses
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.