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[Discuss-gnuradio] Tuning in VLF with a sound card

From: Brad Hein
Subject: [Discuss-gnuradio] Tuning in VLF with a sound card
Date: Thu, 2 May 2019 16:22:24 -0400

I took a Raspberry Pi and attached a 48KHz USB sound card, with a big magnetic loop antenna fed into the mic. A little cheesy? yes! But I'd like to try and see if I can receive VLF. It's in a remote location with little to no interference so I'm thinking my chances should be good. The challenge I'm facing is that I need to write the SDR logic to "tune" throughout the 0-24KHz tuning range.

My question is, being that a sound card source presents samples in float and not the usual complex data type, can I still apply the same SDR logic that we use for SSB/FM/AM demodulation such as those presented in the Gnuradio tutorials (eg. http://www.csun.edu/~skatz/katzpage/sdr_project/sdr/grc_tutorial3.pdf) and if not, how do I go about translating the float input into something I can use to feed existing AM/FM/SSB demodulator flowgraphs?

I run many other flowgraphs on Raspberry Pi's remotely so the networking and remote aspect of the project will be easy for me. I really just need some initial guidance knowing which direction to go in terms of tuning.


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