What is the optimal receiver selectivity in the IF circuitry for SSB voice signals?

The optimal receiver selectivity in the intermediate frequency (IF) circuitry for single sideband (SSB) voice signals is around 2.4 kHz. This bandwidth is considered ideal because it provides a good balance between maintaining intelligibility of the speech and minimizing interference from adjacent channels.

In SSB communication, voice signals can occupy a bandwidth of about 2.4 kHz, which is necessary to ensure that the nuances of speech are preserved for clear communication. A narrower bandwidth might result in a loss of speech clarity, making it difficult for the listener to understand the transmitted message. Conversely, a wider bandwidth can allow unwanted signals and noise from adjacent channels to interfere, degrading the quality of reception.

Choosing 2.4 kHz ensures that the essential frequencies of the transmitted voice signals are captured while suppressing any out-of-band noise or signals, thus making it the most suitable option for SSB voice communications. Other bandwidths either do not provide sufficient clarity for speech or do not effectively filter out interference as required.