Explanation: For a Single Sideband (SSB) transmitter, power is only produced when there is modulation (i.e., an audio signal). The Peak Envelope Power (PEP) rating indicates the maximum power the transmitter can output at the peaks of the modulation envelope. Let's evaluate the options: * **A) In SSB (J3E) voice mode, with the transmitter keyed but without speaking into the microphone, power output**... : In SSB, the carrier is suppressed. Without speaking, there is no modulation, so there should be virtually no power output. Any significant output in this condition would indicate an issue (e.g., carrier bleed-through). * **B) In SSB (J3E) mode, speaking into the microphone causes power meter to fluctuate slightly around the 60 W PEP output**: This is incorrect. Voice signals are highly dynamic; the average power is much lower than the PEP, and only the loudest peaks of your voice would reach the 60 W PEP limit. The power meter would fluctuate significantly, often much lower than 60 W, with occasional peaks reaching the limit. * **C) In SITOR (NBDP) communications, the power meter can be seen fluctuating regularly from zero to the 60 watt PEP output**: SITOR (Narrow-Band Direct-Printing), often used with Automatic Repeat Request (ARQ), transmits data in bursts. During these transmit bursts, the SSB transmitter would be putting out power, potentially up to its 60 W PEP limit. Between bursts, or during receive cycles, the transmitter would be idle (zero output). This regular on-off cycling between zero and the maximum PEP output is a characteristic indication of proper operation for such burst-mode digital communications over SSB. * **D) A steady indication of transmitted energy on an RF Power meter with no fluctuations when speaking into the microphone**: This describes a continuous wave (CW) or a fully modulated AM/FM signal with a constant carrier, not SSB voice. An SSB signal's power output fluctuates dramatically with the speech input. Therefore, option C accurately describes a scenario of proper operation for an SSB transmitter when used with a burst-mode digital communication like SITOR.