Deep Dive: E1B04
The correct answer is C: Cease operation or make changes to the repeater that mitigate the interference. What must the control operator of a repeater operating in the 70-centimeter band do if a radiolocation system experiences interference from that repeater is to cease operation or make changes to the repeater that mitigate the interference. Repeaters must not interfere with radiolocation systems. For amateur radio operators, this is mandatory. Understanding this helps ensure compliance.
Why Other Answers Are Wrong
Option A: Incorrect. Reducing antenna HAAT doesn't necessarily solve the problem - you must cease operation or mitigate interference. HAAT reduction isn't the requirement. Option B: Incorrect. Filing an FAA NOTAM isn't the requirement - you must cease operation or mitigate interference. NOTAM filing isn't the requirement. Option D: Incorrect. Since A and B are not correct, 'all of the above' cannot be correct. Only ceasing operation or mitigating interference is required.
Exam Tip
Repeater interferes with radiolocation = cease operation or mitigate interference. Think 'R'epeater 'I'nterference = 'R'esolve 'I'mmediately (cease or mitigate). Repeaters must not interfere with radiolocation systems. Not HAAT reduction, not NOTAM filing - just cease or mitigate.
Memory Aid
Repeater interferes with radiolocation = cease operation or mitigate interference. Think 'R'epeater 'I'nterference = 'R'esolve 'I'mmediately. Repeaters must not interfere with radiolocation systems. Mandatory compliance requirement.
Real-World Example
A repeater on 70 cm causes interference to a radiolocation system: The control operator must either cease operation (shut down the repeater) or make changes to mitigate the interference (change frequency, reduce power, etc.). This is mandatory - you cannot continue operating if interference occurs. Cease operation or mitigate interference is required.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E1B
Reference: FCC Part 97.205
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E1B topic.