![]() You can use a PC/laptop soundcard or a good USB soundcard. It even has a good method for testing and verifying the loop’s resonance. To get started monitoring SIDs, I highly recommend following the article. See above for a plot of the very SID that was mentioned in the article captured using my system. Using a vlfrx-tools utility called vtsid, VLF transmitters can be monitored. ![]() It’s currently running right now and has been installed since this past December. vlfrx-tools runs on the Pi and does the capture, timestamping to UT, recording, and analysis of the ULF/VLF signals. It consists of a VLF antenna and preamp encased inside of a PVC pipe connected to a Raspberry Pi via a soundcard and a GPS timing receiver. It was based on a system designed by the author of vlfrx-tools, the de-facto open source signal processing tool set for ULF/VLF signals, for an MIT study. ![]() That was my capstone project when I was still a student in 2020. ![]()
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