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VLF Audio Module for the Tangerine SDR
https://tangerinesdr.com/presentations/KC3EEY_VLFmodule_DCC2020.pdf
VLF Audio Module: Design •The VLF audio module will use the Cirrus Logic CS5364 114 dB, 192 kHz, 4-Channel A/D Converter. •Master clock will be obtained from one of the programmable clock channels from the GPSDO. •Audio samples transported via I2S or TDM port to the Data Engine FPGA. •FPGA will set active A/D channels, sampling rate, sample
Natural VLF Radio Listening: Streaming Audio - AB9IL.net
https://www.ab9il.net/vlf/vlf1.html
The streaming audio from these sites is reliable and of high quality, and one can easily hear sferics, submarine communications, and other signals in real time. Streaming audio from the VLF receivers listed above are quite reliable; if one is offline, simply try one of the others. See also the Live VLF Natural Radio page for updates.
VLF Receivers for SIDs - Radio Astronomy (DM2)
https://sites.google.com/site/radioastronomydm2/sids/vlf-receivers-for-sids
VLF Amplifiers A suitable audio frequency amplifier for use with a VLF antenna is easy to build. A gain of 40 to 60dB is ideal and a bandwidth of 10Hz to >24kHz is useful. The 24 kHz figure is set...
VLF & ULF Signals, Receivers & Antennas
https://thenack.com/MWRS/VLF_Signals_Receivers_and_Antennas_MWRS.pdf
VLF & ULF Signals, Receivers and Antennas (cont’d) 2. Receivers [1, 2, 3] • Field strength ranges from about 5µV/m to 4mV/m [6] • Basic receiver is an audio amplifier – With a 1m whip antenna, needs front-end gain of about 30dB to achieve a good SNR for recording purposes. – Ideal bandpass response from about 300Hz to 10kHz.
VLF Audio
https://www.vlfaudio.co.uk/
Very Low Frequency Gigs...Recordings...Subversion
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