Communications with an emission of J3E would typically have a channel spacing of:

Correct Answer: Option D — 3.0 kHz

J3E emission represents Single Sideband (SSB) suppressed carrier telephony. Standard maritime voice communications require a wider bandwidth to maintain audio intelligibility, necessitating a channel spacing of 3.0 kHz. This spacing is the international standard for HF voice channels to ensure clear communication while minimizing interference between adjacent stations.