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 DYFI Earthquake Data Directly to USGS

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

V4Chat is Deprecated

June 22, 2020 -- The V4Chat Program has been available for download here for several years. The program was created as a testbed for the experimental V4 protocol/mode and served it's purpose well, but it did gain popularity after the testing program among Ham experimenters as a fun program for on-air chats. Because of the Winlink Team's limited resources, our development and use of improved modes, and the decline in the on-air use of V4, we have decided to deprecate both the program and mode. V4Chat support will no longer be available from the Winlink Team. Users who have registered the program within the last six months are eligible for a refund from ARSFI by simply requesting it by email and including your callsign and full name. Users interested in a similar chat program using a modern protocol should look at VARA Chat, available at https://rosmodem.wordpress.com.

--The Winlink Development Team

Pages

Have our news pushed to your browser or RSS reader. Click the orange RSS feed icon.

Subscribe to Winlink Global Radio Email RSS
Winlink Linkomatic