Which type of signals is a receiver selectivity of 10 kHz in the IF circuitry best suited for?

A receiver selectivity of 10 kHz in the intermediate frequency (IF) circuitry is particularly well-suited for double-sideband amplitude modulation (AM) signals. This level of selectivity allows the receiver to distinguish between closely spaced signals without significant interference from adjacent channels. In the context of double-sideband AM, the audio information is transmitted using both sidebands, and the 10 kHz bandwidth is adequate for capturing the full fidelity of typical AM broadcasts, which typically fall within the 3 kHz audio bandwidth requirement.

For double-sideband AM signals, having a selectivity around 10 kHz ensures that the receiver can adequately process the modulation while minimizing the response to unwanted signals, preserving the integrity of the received audio. Other types of signals may require different selectivity. For example, digital signals often benefit from narrower bandwidths to avoid interference from adjacent channels, while single sideband voice signals typically require higher selectivity for clearer demodulation. FM signals also tend to use a wider bandwidth than what a 10 kHz selectivity can optimally manage, as they typically require selectivity in the range of several tens of kilohertz to accommodate the frequency modulation characteristics. Thus, for double-sideband AM, a selectivity of