The NAVTEX is powering on and appears to be functioning normally except there have been no new messages for an extended period. The station settings are correct. What is the most likely source of the problem?
• NAVTEX operating frequencies (e.g., 518 kHz for international English broadcasts) • Difference between audio output faults and RF/front-end reception faults • What happens when DC supply voltage is marginal vs when frequency or station selection is wrong
• If the NAVTEX powers on and the display/menu all look normal, which components are clearly already working? • Which single setting or stage, if incorrect, would result in a perfectly normal-looking receiver that simply never receives any new messages? • Would a hardware failure at the antenna base or low DC supply more likely cause intermittent/visible faults, or a complete but plausible-looking lack of traffic?
• Confirm which NAVTEX frequencies are normally used in your operating area and which one should be selected for standard international service. • Consider whether a defective audio amplifier would stop text messages from appearing on the screen, or only affect what you hear from the speaker/headphones. • Think about whether too-low DC voltage or a failed RF amplifier would typically cause error indications, random resets, or loss of all functions rather than just "no new messages".
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