FCC Exam Question: 3-82M5

Which of the following statements about SSB voice transmissions is correct?

A. They use A3E emission which are produced by modulating the final amplifier.
B. They use F3E emission which is produced by phase shifting the carrier.
C. They normally use J3E emissions, which consists of one sideband and a suppressed carrier.
D. They may use A1A emission to suppress the carrier.
Correct Answer: C

Explanation: SSB voice transmissions normally use **J3E emissions**. This emission designator signifies a single sideband with a suppressed carrier. In SSB, the audio signal modulates a carrier, producing two sidebands and the original carrier. To achieve efficiency, one sideband is filtered out, and the carrier is significantly reduced or eliminated before transmission. This saves both bandwidth and power. A) is incorrect because A3E describes Double Sideband Full Carrier Amplitude Modulation (AM), where both sidebands and the full carrier are transmitted. B) is incorrect because F3E describes Frequency Modulation (FM) voice, a completely different modulation scheme from SSB. D) is incorrect because A1A is the emission designator for unmodulated Continuous Wave (CW) Morse code, not voice, and its purpose isn't related to carrier suppression for SSB.

Related Questions
3-39E1
In a microprocessor-controlled two-way radio, a “watchdog” timer:
3-27C5
An LED facing a photodiode in a light-tight enclosure is commonly known as a/an:
3-49F4
What causes a squelch circuit to function?
3-74L2
A 50 microampere meter movement has an internal resistance of 2,000 ohms. What applied voltage is required to indicate half-scale deflection?
3-34E2
What is a characteristic of a NAND gate?

Pass Your FCC Exam!

Study offline, track your progress, and simulate real exams with the GMDSS Trainer app.

Download on App Store Get it on Google Play Download for Mac Download for Windows
Includes Elements 1, 3, 6, 7R, 8, and 9.