What is the highest legal carrier frequency on the 20-meter band for transmitting a 2.8 kHz wide USB data signal?

Q: What is the highest legal carrier frequency on the 20-meter band for transmitting a 2.8 kHz wide USB data signal?

The correct answer is C: 14.1472 MHz. The correct answer is C: 14.1472 MHz. The authorized 20-meter data segment ends at 14.150 MHz. A 2.8 kHz wide upper-sideband data signal extends upward from the displayed carrier frequency, so subtracting 2.8 kHz from 14.150 MHz gives a highest legal carrier frequency of 14.1472 MHz.

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Deep Dive: E1A03

The correct answer is C: 14.1472 MHz. The authorized 20-meter data segment ends at 14.150 MHz. A 2.8 kHz wide upper-sideband data signal extends upward from the displayed carrier frequency, so subtracting 2.8 kHz from 14.150 MHz gives a highest legal carrier frequency of 14.1472 MHz.

Why Other Answers Are Wrong

Option A: 14.0708 MHz is legal but is not the highest possible carrier frequency. Option B: 14.1002 MHz is also below the highest possible carrier frequency. Option D: A 2.8 kHz USB data signal at 14.3490 MHz is outside the authorized 20-meter data segment.

Exam Tip

For USB at an upper band edge, subtract the full occupied bandwidth: 14.1500 - 0.0028 = 14.1472 MHz.

Memory Aid

14.150 minus 2.8 kHz equals 14.1472 MHz.

Source & Coverage

Question Pool: 2024-2028 Question Pool

Subelement: E1A

Reference: [97.305, 97.307(b)]

Key Concepts

20-meter data segment upper sideband occupied bandwidth band edge

Official Pool Source

Question text and answer key are synchronized with the current NCVEC Extra Class pool and mapped to the E1A topic.