Which of the following controls could be used if the voice pitch of a single-sideband signal returning to your CQ call seems too high or low?

The selection of the RIT (Receiver Incremental Tuning) or Clarifier is appropriate for adjusting the voice pitch of a single-sideband (SSB) signal that seems too high or low during reception. The RIT allows operators to make fine adjustments to the frequency of the received signal without altering the overall frequency setting on their transceiver. This is particularly useful in SSB communication, where slight frequency deviations may result in pitch changes that can affect intelligibility.

When you encounter a voice pitch that sounds abnormal, adjusting the RIT or Clarifier can help bring the signal into a clearer and more natural-sounding range. This capability is crucial for effective communication, as it helps to compensate for drift in signal frequency or differences in the tuning of the transmitting and receiving equipment.

The other choices, while useful in various contexts, do not specifically address the issue of pitch adjustment for SSB signals. The AGC (automatic gain control) and limiter are designed to manage audio levels and prevent distortion rather than to fine-tune pitch. The bandwidth selection affects the clarity of the signal and noise rejection but does not directly change the pitch. Tone squelch manages signal filtering based on audio tones and is not intended for pitch correction.