What is the channel spacing for authorized F1B/J2B frequencies?

The correct answer regarding the channel spacing for authorized F1B/J2B frequencies is based on the established telecommunications regulations governing these specific emissions. F1B denotes narrowband frequency modulation, often used in maritime communication, while J2B is a standard for digital communication using a form of frequency-shift keying (FSK).

For F1B/J2B emissions, the channel spacing requirements are designed to minimize interference between nearby channels and ensure clear communication. A spacing of 500 Hz is specified to accommodate the characteristics of the signal and the operational environment, providing sufficient separation for effective use without unnecessary overlap.

Understanding channel spacing is crucial in ensuring that various forms of communication can coexist effectively within the same frequency bands, which is particularly important in maritime settings where multiple vessels may be communicating simultaneously. This standard spacing helps maintain the integrity of each transmission, facilitating reliable operations under the Global Maritime Distress and Safety System (GMDSS).

The other frequency spacings offered would not align with the practical and regulatory guidelines set for F1B/J2B emissions, thus confirming that 500 Hz is the recognized standard for those particular frequency ranges.