FCC Exam Question: 1-15C3

To set-up the MF/HF transceiver for a voice call to a coast station, the operator must:

A. Select J3E mode for proper SITOR operations.
B. Select F1B mode or J2B mode, depending on the equipment manufacturer.
C. Select J3E mode for proper voice operations.
D. Select F1B/J2B modes or J3E mode, depending on whether FEC or ARQ is preferred.
Correct Answer: C

Explanation: For a voice call on MF/HF frequencies, the internationally recognized and standard mode is J3E. J3E is the ITU emission designator for single-sideband, suppressed carrier telephony (voice). This mode is highly efficient for long-distance voice communication on these bands due to its narrow bandwidth and power efficiency compared to older AM modes. Options A, B, and D are incorrect because F1B and J2B are emission designators for digital modes like RTTY, SITOR, or other data transmissions, not voice. SITOR, FEC, and ARQ are error-correction and data transfer protocols used with digital modes, not for basic voice communication. Therefore, selecting J3E ensures proper voice operations for your call.

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