![]() ![]() PulseAudio is a consumer-grade sound server that is part of many Linux desktop distributions, including Ubuntu. Here are three ways to connect the audio output from a WebSDR to fldigi running on a PC with a single audio device (sound card or chip): The Configuration chapter in the Fldigi Users Manual includes a page about sound card configuration. The SoundflowerBed application for simultaneously listening to the audio on Soundflower channels is included with the download. Select it for the output, and also select Soundflower as the input source for your digital modem program. After installation, Soundflower appears as an audio device in the Sound output menu of OS X. Soundflower is a free, open source Mac system extension that enables you to channel audio from one application to another. Here are some options: Audio Routing in Mac OS X A disadvantage of using a microphone is pickup of extraneous noise.Īs an alternative to using a cable or microphone, software extensions can route the audio electronically. This is a quick and easy way to test your setup, and hearing the audio helps blind or vision-impaired hams tune the webSDR. You can also use a microphone to pick up the audio from a speaker. Please note that without an external attenuator in the circuit, this might damage the sound card. One way to route webSDR audio from a browser to a modem program is to use an audio cable between the Speaker/Headphone jack and an audio input jack on a PC. The webSDR server there streamed the audio over the Internet to fldigi running on my computer in the USA.įigure 1. It was transmitted from the Ukraine on the 20 meter band and received by a software defined receiver in the University. PSK31 Reception Using webSDRįigure 1 shows an fldigi modem receiving a PSK31 signal via the webSDR station at the University of Eindhoven, Netherlands. This article gives details about how to channel webSDR audio from your browser into a digital modem program for decoding. The user interface and the accessibility of webSDRs for blind and vision-impaired hams are described in a separate article. WebSDR servers are open for free use by anyone with a broadband Internet connection. You can connect to a webSDR with a Web browser, tune the radio to receive the signals you want, and use a digital modem program on your computer to decode the text. A webSDR is a software defined receiver that can be used remotely via the Internet. This article describes how to receive amateur radio digital modes such as PSK31 using a webSDR instead of your own radio. ![]()
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