Tuesday, October 28, 2008

A Soundcard Based VLF Receiver

SAQrx is a soundcard based USB (Upper SideBand) receiver covering 0-22 kHz. The filter bandwidth is selectable in three steps, 300, 1000 and 2400 Hz. SAQrx was written primarily for reception of the 2006 Christmas transmission from SAQ but it was made tunable so it can be used for other purposes while waiting for the next SAQ transmission :-) SAQrx requires a soundcard capable of full duplex at 44100Hz sampling frequency. Most soundcards can do this. More information about the old longwave transmitting station SAQ, which was declared as a world cultural heritage by UNESCO in 2004, can be found at http://www.alexander.n.se and at Wikipedia. Download the SAQ receiver here


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