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Let’s first explain what is meant by digital communications:
Digital communications include anything and everything that could be viewed on a computer screen. That is, text and graphics. Text is anything that is typewritten, Graphics is anything and everything that is captured in digital format and includes photographs, drawings, maps and weather charts and the like. Easiest to transmit are text messages. However, these should be kept reasonably short and, preferably, have no or only small attachments. They should never include the text of the message being replied to. Graphics are a lot more difficult to deal with. They should be reduced to a manageable size. For example, they should be compressed or “zipped” and photographs should be cropped to the minimal size possible. Text messages can be as small as 2 Kb. Photographs (at 72 dpi) as little as 5 to 10 Kb. Any attachments should be compressed, ideally, to something far less than 50 Kb. Fortunately, Winlink has a build-in feature that will compress much of the routine material that it processes, including, text files; weather charts or weather text; GRIB files (the wind direction forecasts that overlay on electronic navigation charts); and News Digests etc.
Now to Slide 4/16 |
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