How do you join a contact between two stations using the PACTOR protocol?
The correct answer is C: Joining an existing contact is not possible, PACTOR connections are limited to two stations. When using the PACTOR protocol, joining an existing contact is not possible - PACTOR connections are limited to two stations. PACTOR is a point-to-point protocol that only supports two stations. For amateur radio operators, this is a limitation of PACTOR. Understanding this helps when operating PACTOR.
Exam Tip
PACTOR = cannot join existing contact, limited to two stations. Think 'P'ACTOR = 'P'oint-to-'P'oint (two stations only). PACTOR connections are limited to two stations - joining an existing contact is not possible. Not about broadcast packets, carriers, or NAK codes - just two-station limit.
Memory Aid
"PACTOR = cannot join existing contact, limited to two stations. Think 'P'ACTOR = 'P'oint-to-'P'oint. PACTOR connections are limited to two stations - joining is not possible. Point-to-point protocol limitation."
Real-World Application
Two stations are using PACTOR to exchange email. You cannot join this connection - PACTOR only supports two stations at a time. If you want to communicate, you must wait for the connection to end, then establish your own two-station connection. PACTOR is a point-to-point protocol.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Sending broadcast packets won't join an existing PACTOR connection - PACTOR only supports two stations, so joining isn't possible.
Option B: Incorrect. Transmitting a steady carrier won't join a PACTOR connection - it would just cause interference. PACTOR doesn't allow joining.
Option D: Incorrect. Sending a NAK code won't join a PACTOR connection - PACTOR is limited to two stations, so joining isn't possible.
题目解析
The correct answer is C: Joining an existing contact is not possible, PACTOR connections are limited to two stations. When using the PACTOR protocol, joining an existing contact is not possible - PACTOR connections are limited to two stations. PACTOR is a point-to-point protocol that only supports two stations. For amateur radio operators, this is a limitation of PACTOR. Understanding this helps when operating PACTOR.
考试技巧
PACTOR = cannot join existing contact, limited to two stations. Think 'P'ACTOR = 'P'oint-to-'P'oint (two stations only). PACTOR connections are limited to two stations - joining an existing contact is not possible. Not about broadcast packets, carriers, or NAK codes - just two-station limit.
记忆口诀
PACTOR = cannot join existing contact, limited to two stations. Think 'P'ACTOR = 'P'oint-to-'P'oint. PACTOR connections are limited to two stations - joining is not possible. Point-to-point protocol limitation.
实际应用示例
Two stations are using PACTOR to exchange email. You cannot join this connection - PACTOR only supports two stations at a time. If you want to communicate, you must wait for the connection to end, then establish your own two-station connection. PACTOR is a point-to-point protocol.
错误选项分析
Option A: Incorrect. Sending broadcast packets won't join an existing PACTOR connection - PACTOR only supports two stations, so joining isn't possible. Option B: Incorrect. Transmitting a steady carrier won't join a PACTOR connection - it would just cause interference. PACTOR doesn't allow joining. Option D: Incorrect. Sending a NAK code won't join a PACTOR connection - PACTOR is limited to two stations, so joining isn't possible.
知识点
PACTOR, Point-to-point, Two-station limit, Digital protocols
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.