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VLF & ULF Signals, Receivers & Antennas
https://thenack.com/MWRS/VLF_Signals_Receivers_and_Antennas_MWRS.pdf
• 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. • 50Hz interference is a big problem (audible). • Filter out broadcast station (overload & detection) – easy to achieve.
Natural VLF Radio Listening: Streaming Audio - AB9IL.net
https://www.ab9il.net/vlf/vlf1.html
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. Most fascinating to listen to are the stereo audio streams, which can become quite active during geomagnetic storms.. Start up the streams and listen to live natural radio ...
IW0BZD Antenna Loop per VLF, descrizione autocostruzione ...
https://www.qsl.net/iw0bzd/VLF_Loop.htm
L'antenna loop in banda VLF costituisce un metodo valido per l'ascolto dei segnali presenti in banda il minimo ingombro e la versatilità ne fanno un elemento immancabile nell'ascolto amatoriale delle VLF.. ... poter portare anche l'alimentazione di pochissimi mA al preamplificatore e trasportare il segnale verso la scheda audio del PC. Per ...
PC with soundcard used as VLF receiver - QSL.net
https://www.qsl.net/dl4yhf/speclab/vlf_rcvr.htm
The PC is used to convert the VLF signal into an audible signal Soundcard runs at a sample rate of 44100 or 48000 Hz (see Notes) Frequency is converted down to an audio frequency of 650Hz (or similar) 650 Hz "Audio IF" is passed through a narrow-band filter (100Hz BW) The amplified audio is sent to the soundcard's D/A converter.
A very simple VLF Pocket receiver
http://www.vlf.it/fritz/pocketrx.html
The demodulated audio signal is available at Pin 19 where an audio low pass filter is connected. Following the audio lowpass, there is an additional audio bandpass filter. The combination of the low-and bandpass-filter supresses the unwanted military data …
Using a PC sound card to receive VLF radio signals - …
https://www.youtube.com/watch?v=L2W1x6Rb9hI
Just connect an antenna to your computer's microphone input, and you can receive VLF (Very Low Frequency) radio signals! A sound card (or built-in sound chip...
VLF Receiver for SID Monitoring | PhysicsOpenLab
https://physicsopenlab.org/2020/05/07/vlf-receiver-for-sid-monitoring/
VLF Receiver. We adopted the VLF receiver from UKRAA, which we acquired as a Kit. The assembling of the kit is simple and very well documented. We put the board, together with the antenna tuning unit, inside a metal box, as shown in the images below. The receiver basically is a tunable audio frequency amplifier with an envelope detector.
A Simple Regenerative VLF-LF Receiver - TPG
http://users.tpg.com.au/users/ldbutler/VLF_Regen_Rx.pdf
With the high noise level at VLF, the audio filter is a desirable addition to restrict the detected noise when receiving morse or radio teletype signals in the VLF band. To use the filter, the beat frequency is set to 800Hz. With the regenerative RF circuit, this is achieved by off-setting the tuning 800Hz from the received signal frequency.
Very Low Frequency (VLF) Detector Circuit - Homemade ...
https://www.homemade-circuits.com/very-low-frequency-vlf-detector-circuit/
The last circuit is the audio amp section so you can plug head phones in to listen. Also the vlf receiver circuit takes a 9 volts battery and its input voltage is linked to the front sense head section so they can both share one 9 volts battery.
Types of VLF Signals - theinspireproject.org
https://theinspireproject.org/default.asp?contentID=17
The VLF radio signal is ducted to the receiver between the surface of the earth and layers in the ionosphere which reflect radio waves. This path is called the earth-ionosphere waveguide. Note: We can't really "hear" radio waves. The audio range refers to the radio waves that, when fed directly into a speaker, can be heard. Low Density Sferics
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