What is the standard scan rate for high-frequency weather facsimile reception from shore stations?

The standard scan rate for high-frequency weather facsimile reception from shore stations is indeed 120 lines per minute. This rate is established to ensure adequate resolution and clarity for the transmission of meteorological data over radio frequencies. The 120 lines per minute rate strikes a balance between providing a sufficiently detailed image and the limitations of the transmission medium, allowing for effective reception and interpretation of important weather information. This standard is critical in maintaining the reliability and usability of weather facsimile information for sailors, aviators, and other users who rely on up-to-date weather data for safety and navigation.

In contrast, scan rates higher than this, such as 240 or 300 lines per minute, may be used in other contexts or formats, but they are not the standard for high-frequency weather facsimile transmission. Lower rates, such as 60 lines per minute, do not provide the resolution necessary for accurate interpretation of the graphical data.