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• • • • $68 JVComm32 Best Buy in PC-Based HF Weatherfax Of five packages tested, we also like Coretex Weatherfax 2000, but had problems running the much more expensive Weatherstation 2000 HW and PC HF Facsimile 8.0 Once we were sailing from Bermuda to Antigua and listening closely to Herb on Southbound II give his synopsis of what we could expect for weather. Instead of his usual self-assured mother-hen delivery, he seemed to be holding back a little. Oh, if we could just see what he saw! JVComm32 from Germany is one of several shareware programs tested. It’s hard to believe, but high frequency (HF) weatherfax has been around since 1926.

In that year, Charles Francis Jenkins, together with the US Navy, broadcast the first weather maps from Arlington, Virginia to ships at sea. His technique is still the basis for the HF weatherfax information we use today. How It Works In the US, HF weatherfaxes are weather charts and forecasts from the National Weather Service, broadcast by the US Coast Guard for ships at sea. Other countries also broadcast weatherfax information.

The broadcasts are on the HF shortwave bands between 10 meters and 80 meters (3.5 MHz to 30.0 MHz) and are broadcast on the upper sideband (USB). To receive these broadcasts, you need a shortwave receiver or a frequency-tunable SSB radio. You can find the lists of transmitters, frequencies, and times in various reference books such as Reed’s Almanac and, for example, on the Internet at. Just like the fax machine in your office (and in many homes), the broadcast station sends out a facsimile of the weather chart. The transmission is a digital representation of the original weather chart.

HF weatherfax broadcasts consist of two tones—a tone for a black level and a different tone for a white level. The broadcast station sends out the weather chart by raster scanning the original page, i.e., scan from the top left to the top right, drop down a line and repeat the left-to-right sequence. This scanning continues for the entire page. To begin a broadcast of a weather chart or document, the broadcast begins with a synchronization pulse of 5% white and 95% black. The synchronization signal lasts for a few lines and then the chart information is sent. On each scan line is a 5% black area that defines the left margin. As noted, the broadcast consists of only two tones.

Digital fashion pro 8 torrent download. Without any clocking information in the transmitted signal, the transmitting station and the receiving equipment may be operating at slightly different rates or frequencies. This difference in rates causes a skew in the received weatherfax chart in which the left margin drifts to the right as it goes down the page, or to the left. All of the programs we tested allowed us to manually remove skew or else were smart enough to remove skew automatically. It used to be that the only way to receive an HF weatherfax was with a dedicated radio receiver with a paper output. However, with the advent of personal computers, it’s possible to use your PC laptop to receive HF weatherfax charts and display them directly on the screen.

You may have to work with the settings > Open Ekiga > Edit > Preferences > Devices > Video Devices > try changing some of the settings. Web camera. Push the 4th button from the top (a grey round webcam). Try using Ekiga see if the cam works/detected. (try both V4L and V4L2) To test your webcam you can do this: There are 6 icons on the left side of the main Ekiga window.