When may a public coast station authorized to use high frequency narrow-band direct-printing (NB-DP) establish contact with a ship station using telegraphy?
• Public coast station licensing and operating authority for different transmission modes • Rules for high frequency (HF) NB-DP versus traditional telegraphy/telex operation • Conditions related to harmful interference when using alternative communication methods
• Ask yourself under what conditions a coast station may legally use a different emission mode than the one normally required for NB-DP contact. • Consider whether ship size (gross tonnage) or equipment features (like selective calling devices) are primary legal factors, or if another regulatory document controls this. • Think about what the radio station license actually specifies and how that affects what modes can be used.
• Check whether the rules emphasize station license authority rather than ship size or equipment as the controlling factor. • Verify if avoiding harmful interference is a standard condition when using HF telegraphy instead of NB-DP. • Confirm whether the regulations ever state that contact using telegraphy is never permitted for NB-DP-authorized stations.
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