Deep Dive: E1F01
The correct answer is B: Only on amateur frequencies above 222 MHz. On what frequencies are spread spectrum transmissions permitted is only on amateur frequencies above 222 MHz. Spread spectrum is only allowed above 222 MHz. For amateur radio operators, this is important for spread spectrum operation. Understanding this helps ensure legal spread spectrum operation.
Why Other Answers Are Wrong
Option A: Incorrect. Above 50 MHz isn't correct - spread spectrum is only allowed above 222 MHz, not 50 MHz. 50 MHz is too low. Option C: Incorrect. Above 420 MHz isn't correct - spread spectrum is allowed above 222 MHz, not just above 420 MHz. 420 MHz is too restrictive. Option D: Incorrect. Above 144 MHz isn't correct - spread spectrum is only allowed above 222 MHz, not 144 MHz. 144 MHz is too low.
Exam Tip
Spread spectrum permitted = only above 222 MHz. Think 'S'pread 'S'pectrum = 'S'tarts at '2'22 MHz. Spread spectrum transmissions are only permitted on amateur frequencies above 222 MHz. Not above 50 MHz, not above 420 MHz, not above 144 MHz - just above 222 MHz.
Memory Aid
Spread spectrum permitted = only above 222 MHz. Think 'S'pread 'S'pectrum = '2'22 MHz. Spread spectrum transmissions are only permitted on amateur frequencies above 222 MHz. Important for spread spectrum operation.
Real-World Example
Spread spectrum transmissions: They are only permitted on amateur frequencies above 222 MHz (e.g., 222-225 MHz, 420-450 MHz, etc.). Spread spectrum is not allowed on frequencies below 222 MHz (e.g., HF, 6m, 2m). This is the restriction - spread spectrum only above 222 MHz.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E1F
Reference: FCC Part 97.311
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E1F topic.