🔍 Key Concepts

• Emission designators (F1B, J2B, J3E, F3E, G3E) and what types of signals they represent • How frequency spacing (e.g., channels ending in .0 or .5 kHz) relates to narrow‑band vs wide‑band signals • Typical bandwidth requirements for data/telex (NBDP/SITOR) vs voice (SSB or FM) transmissions

💭 Think About

• Look at how closely spaced frequencies that end in .0 or .5 kHz would affect the type of signal you can transmit without overlapping adjacent channels. Which emission needs very narrow spacing? • Compare the normal bandwidth of SSB voice and FM voice with the bandwidth of telex/data signals. Which one fits better into a channel plan where every step is only 0.5 kHz? • Think about where you usually see SITOR/NBDP services versus where you see voice services. Which one is more likely to be assigned very tightly spaced channels?

✅ Before You Answer

• Verify the approximate bandwidth (in kHz) of SSB voice, FM voice, and NBDP/SITOR data signals. • Check which emissions (from the choices) are associated with narrow‑band direct‑printing (NBDP) or SITOR telex, and which are clearly labeled as voice. • Confirm whether FM voice emissions typically require far more than 0.5 kHz channel spacing.