What symptoms may result from other signals interfering with a PACTOR or VARA transmission?
The correct answer is D: All these choices are correct. Symptoms that may result from other signals interfering with a PACTOR or VARA transmission include: frequent retries or timeouts, long pauses in message transmission, and failure to establish a connection between stations. All three are common symptoms of interference. For amateur radio operators, recognizing these symptoms helps diagnose interference problems. Understanding this helps when troubleshooting digital mode communications.
Exam Tip
All three are interference symptoms: retries/timeouts, long pauses, connection failures. When all listed symptoms occur with PACTOR/VARA interference, 'all of the above' is usually the answer. All indicate interference problems.
Memory Aid
"All three are interference symptoms: Retries/timeouts, Long pauses, Connection failures. Think 'A'll 'I'nterference 'S'ymptoms. All three indicate interference problems with PACTOR or VARA transmissions."
Real-World Application
You're using PACTOR and experiencing interference. You notice: (1) Frequent retries and timeouts as the protocol tries to recover, (2) Long pauses in message transmission while waiting for clear channels, (3) Failure to establish connections when interference is severe. All three symptoms indicate interference is affecting your digital communications.
Key Concepts
Why Other Options Are Wrong
Option A: While correct, this is incomplete. Long pauses and connection failures are also symptoms.
Option B: While correct, this is incomplete. Retries/timeouts and connection failures are also symptoms.
Option C: While correct, this is incomplete. Retries/timeouts and long pauses are also symptoms.
题目解析
The correct answer is D: All these choices are correct. Symptoms that may result from other signals interfering with a PACTOR or VARA transmission include: frequent retries or timeouts, long pauses in message transmission, and failure to establish a connection between stations. All three are common symptoms of interference. For amateur radio operators, recognizing these symptoms helps diagnose interference problems. Understanding this helps when troubleshooting digital mode communications.
考试技巧
All three are interference symptoms: retries/timeouts, long pauses, connection failures. When all listed symptoms occur with PACTOR/VARA interference, 'all of the above' is usually the answer. All indicate interference problems.
记忆口诀
All three are interference symptoms: Retries/timeouts, Long pauses, Connection failures. Think 'A'll 'I'nterference 'S'ymptoms. All three indicate interference problems with PACTOR or VARA transmissions.
实际应用示例
You're using PACTOR and experiencing interference. You notice: (1) Frequent retries and timeouts as the protocol tries to recover, (2) Long pauses in message transmission while waiting for clear channels, (3) Failure to establish connections when interference is severe. All three symptoms indicate interference is affecting your digital communications.
错误选项分析
Option A: While correct, this is incomplete. Long pauses and connection failures are also symptoms. Option B: While correct, this is incomplete. Retries/timeouts and connection failures are also symptoms. Option C: While correct, this is incomplete. Retries/timeouts and long pauses are also symptoms.
知识点
PACTOR, VARA, Interference symptoms, Digital mode problems
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.