What is the correct adjustment for the LOAD or COUPLING control of a vacuum tube RF power amplifier?
The correct answer is D: Desired power output without exceeding maximum allowable plate current. The correct adjustment for the LOAD or COUPLING control of a vacuum tube RF power amplifier is desired power output without exceeding maximum allowable plate current. You adjust the load/coupling to achieve your desired power output while staying within plate current limits. For amateur radio operators, this is how you properly set up a tube amplifier. Understanding this helps when tuning amplifiers.
Exam Tip
LOAD/COUPLING adjustment = desired power output without exceeding max plate current. Think 'L'OAD = 'L'oad for 'O'utput 'A'nd 'D'on't exceed plate current. Adjust to achieve desired power while staying within plate current limits. Not SWR, not minimum current, not highest voltage - just desired power within limits.
Memory Aid
"LOAD/COUPLING adjustment = desired power output without exceeding max plate current. Think 'L'OAD = 'L'oad for 'O'utput 'A'nd 'D'on't exceed. Adjust to achieve desired power while staying within plate current limits. Proper amplifier tuning."
Real-World Application
You tune a vacuum tube RF power amplifier. You adjust the LOAD/COUPLING control to achieve your desired power output (e.g., 500 watts) while ensuring plate current doesn't exceed the maximum (e.g., 1 amp). This is the correct adjustment - desired power within safe plate current limits.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Minimum SWR isn't the adjustment criterion - SWR is about antenna matching, not amplifier tuning. Load/coupling is about power transfer, not SWR.
Option B: Incorrect. Minimum plate current isn't the goal - you want desired power output. Minimum plate current would give minimum power.
Option C: Incorrect. Highest plate voltage isn't the adjustment - you want desired power output. Plate voltage is usually fixed.
题目解析
The correct answer is D: Desired power output without exceeding maximum allowable plate current. The correct adjustment for the LOAD or COUPLING control of a vacuum tube RF power amplifier is desired power output without exceeding maximum allowable plate current. You adjust the load/coupling to achieve your desired power output while staying within plate current limits. For amateur radio operators, this is how you properly set up a tube amplifier. Understanding this helps when tuning amplifiers.
考试技巧
LOAD/COUPLING adjustment = desired power output without exceeding max plate current. Think 'L'OAD = 'L'oad for 'O'utput 'A'nd 'D'on't exceed plate current. Adjust to achieve desired power while staying within plate current limits. Not SWR, not minimum current, not highest voltage - just desired power within limits.
记忆口诀
LOAD/COUPLING adjustment = desired power output without exceeding max plate current. Think 'L'OAD = 'L'oad for 'O'utput 'A'nd 'D'on't exceed. Adjust to achieve desired power while staying within plate current limits. Proper amplifier tuning.
实际应用示例
You tune a vacuum tube RF power amplifier. You adjust the LOAD/COUPLING control to achieve your desired power output (e.g., 500 watts) while ensuring plate current doesn't exceed the maximum (e.g., 1 amp). This is the correct adjustment - desired power within safe plate current limits.
错误选项分析
Option A: Incorrect. Minimum SWR isn't the adjustment criterion - SWR is about antenna matching, not amplifier tuning. Load/coupling is about power transfer, not SWR. Option B: Incorrect. Minimum plate current isn't the goal - you want desired power output. Minimum plate current would give minimum power. Option C: Incorrect. Highest plate voltage isn't the adjustment - you want desired power output. Plate voltage is usually fixed.
知识点
LOAD control, COUPLING control, Plate current, Power output
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.