If frequency listings end in either .0 or .5 kHz, what kind of emission is used?

The emission type associated with frequency listings that end in either .0 or .5 kHz is indeed F1B/J2B SITOR (NBDP). This correlation arises from the modulation practices of different types of emissions.

SITOR (Simplex Telex Over Radio) operates using the narrow bandwidth modes of F1B or J2B. These emissions are specifically designed for digital data transmission, often employed in maritime communications. The standard for setting frequencies for SITOR is that they typically end in .0 or .5 kHz, which allows for better regulation and minimizes interference with adjacent channels.

In contrast, the other emission types listed have different characteristics and frequency designations. For instance, Single Sideband (SSB) voice emissions, such as J3E, utilize frequencies that often do not conform to the .0 or .5 kHz standard but vary instead. FM voice emissions, designated as F3E or G3E, similarly do not conform to these frequency listings and are used for other specific radio communications than those intended for data modes like SITOR.

Thus, the unique frequency endings of .0 and .5 kHz prominently signal the use of F1B/J2B SITOR (NBDP)