Web31 Internet Gateway

PSK31 encodes data into a narrow audio signal. Dozens of these streams can fit into the audio passband of a modern communications receiver. Available software will detect and decode multiple streams simultaneously. Web31 is a project to monitor PSK31 bands, decode as many signals as possible, and publish the decoded text to the internet. Learn more about PSK31 from WM2U, EA2BAJ or K1VY.

You can use any of the pages in the table below to view Web31 data that is being recorded right now. All of these pages look at the same information: qso transcripts and waterfall images. The pages vary in how they organize this information and how much they process it. Click on a miniture to visit the corresponding page at our fisrt web31 site located in the Northwest United States. Use your browser's back button to return here.

	Use this page to monitor current reception conditions and read recently recorded transcripts. Issue searches on the whole database from the bottom of this page.
	This long waterfall shows signal activity within the receiver's passband over a three minute interval. New data is available every ten seconds and only new data need be downloaded to update the whole display.
	This page summarizes site reception statistics hour by hour and day by day. The color code indicates which bands have been used. Click any hour to see those transcripts.
	This map shows the placement of grid squares found among the transcripts in the database. The map is remade each time you look. It takes a few minutes so be patient.

This diagram shows how Web31 works. Let's follow the information from antenna to internet, that is, from right to left. PSK31 signals are detected by the radio (icom 735) to produce a chorus of audio signals. The Web31 Decoder (vb/windows) converts the audio into computer files that it updates every ten seconds. The Web31 Server (perl/linux) formats these files into html pages which are delivered to you through a cable modem at your request.

This is what the Web31 Decoder looks like on the computer screen at the radio site. We are now alpha testing this software at other similarly equiped locations. Send us email if you have this sort of equipment and would like to participate.

This screen shot shows the vb program in operation. The numbers above the waterfall indicate decoding channel assignments. The color, when present, indicates unsquelched reception. The more yellow the color, the better the signal.

The Web31 Decoder is a derivative of a beautifully simple sample program by Eric Sundstrup VK7AAB. It uses the awesome corepsk.dll by Moe Wheatley AE4JY for all digital signal processing. I'm indebted to Cal Diller of Metratek for his kind assistance getting started.