Winlink

New Study Compares Winlink Digital Modes Performance

HF Mode measurements under varying S/N and MPG conditions.

5 July 2020 -- A revision of a study evaluating Winlink digital modes using the new IONOS HF Path Simulator was published today. Hardware SCS modems running PACTOR 2, 3 and 4 were evaluated as were sound card modes WINMOR, ARDOP and VARA across a variety of channel models and across a range of signal to noise conditions for HF. VARA testing included a new VARA 500 500Hz mode. VARA FM and AX.25/FX.25 packet were simulated for a VHF channel.

Spoiler alert: The SCS modems did very well as you would expect. The much less expensive VARA HF did especially well across the range of conditions tested. The SCS modems and VARA could run long test cases without losing a connection while ARDOP and WINMOR were slower and less reliable for lower SNR MP cases. VARA FM crushed AX.25/FX.25 VHF cases.

The complete paper is available in PDF format from the link below.

--The Winlink Team

New Winlink Form Submits Earthquake Data Directly to USGS Database

4 July 2020 -- Today, on the one-year anniversary of the M7.1 Ridgecrest Earthquake in Southern California, Winlink presents "Did You Feel It for Winlink Express". Through cooperative efforts with the United States Geological Survey, Amateur radio operators worldwide can now report the effects of an earthquake at their location directly to the USGS. No infrastructure required.

The Did You Feel It (DYFI) system was developed by the USGS to tap the abundant information available about earthquakes from the people who experience them. By taking advantage of the vast number of Internet users, and Amateur operators with Winlink radio clients, the USGS gets a more complete description of what people experienced, the effects of an earthquake, and the extent of damage. And best of all, with Amateur radio's help they can do so rapidly.

By providing a DYFI report when you can do so safely after an earthquake you contribute to citizen science and further the understanding of earthquakes. You also ensure that your area has been represented in the compilation of the maps of shaking. This is a two-way street: not only will you add valuable information on the extent of ground shaking and damage, but in the process we hope you will learn more about how other communities fared and gain a greater understanding of the effects of earthquakes.

The HTML form is available in the Standard Forms library in the USGS folder. Direct questions about the form and its use to: K6OLI Oliver Dully, [email protected].

More information on the USGS "Did You Feel It" program is at https://earthquake.usgs.gov/data/dyfi/ and in the document downloadable using the link below.

--The Winlink Team

WANTED:

Software Developers
The Winlink Development Team is looking for talented software developers who have expertise in Digital Signal Processing, VB, C#, C, C++ with Windows, OSX, iOS, Android, Open-Source Project Management, Git and AWS. We need developers who can move our programs to new platforms and environments, and to help develop new projects for the future. If you have some volunteer time, are willing to help, work well with others and would like to join an accomplished team, please contact Tom, KA6IQA

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