Serial Jvcomm32 Registration

Note: To find the required registration information please see the sticker attached to the registration card included with your product. This sticker contains both the model number and the serial number for your product.

• • • • $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. 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. Programs Tested For this evaluation, we looked at five PC programs that receive HF weatherfax charts.

Most of these packages have many bells and whistles in addition to the basic reception of HF weatherfax. We limited our evaluation to the installation, ease of use, and “does it work” tests for the HF weatherfax sections of these programs. We did not evaluate other features such as weather chart annotation, satellite imaging, animation, Internet connectivity, NavTex and Radio Telex. The test laptop was a Dell Inspiron 3000 with a Pentium 233 MHz processor, 64 MB memory, and an 800 x 600 16-bit color LCD screen. We began the tests with Windows 95, but one of the programs had problems with Windows 95 so the manufacturer asked us to try it with Windows 98, which we did.

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For the SSB radio we used an ICOM M710RT with an ICOM AT-130 antenna tuner connected to a backstay antenna. The audio output from the SSB for the program inputs came from either the audio frequency (AF) output or the loudspeaker output. More on this later. The good news is that all these programs did work on an older laptop for capturing HF weatherfax broadcasts. As expected, some worked better than others. Learn Before Going The learning curve on using these programs for basic HF weatherfax reception is not steep.

However, it took us many hours of playing with the radio and software to get the hang of actually capturing HF weatherfax charts. The time it takes to receive an HF weatherfax chart transmission is about 10 minutes. It takes considerable time, however, to prepare for those 10 minutes.Broadcasting stations send out many different types of weatherfax charts all day long.