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Using a PC sound card to receive VLF radio signals (lightning strike detection)

26 Views • 01/24/23
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Life_N_Times_of_Shane_T_Hanson
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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) with a recording sampling rate of at least 96 kHz is recommended. <br> <br>Example of using this method to receive VLF signals from Russia and Europe: <br>http://www.youtube.com/watch?v=fKSOoZ2vhvo <br> <br>SDR Sharp software (for Windows) to receive and record VLF (and many other) radio signals: <br>http://sdrsharp.com/#download <br>Similar SDR (Software Defined Radio) applications are available for Linux and Mac OS. <br> <br>Lists of VLF stations: <br>http://sidstation.loudet.org/s....tations-list-en.xhtm <br>http://www.smeter.net/stations/vlf-stations.php <br> <br>Common sources of radio interference and recommended solutions: <br>http://www.ccrane.com/!wcjHVrO....wu6BDBDjo39xwNw!/AM- <br> <br>About the accidental recording of VLF station GBR (16 kHz) contained on Mike Oldfield's &quot;Tubular Bells&quot; album: <br>http://alancordwell.co.uk/personal/index.php <br>http://gkircher.stormloader.com/vlfcd/ <br>http://en.wikipedia.org/wiki/Rugby_Radio_Station

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Life_N_Times_of_Shane_T_Hanson

https://www.youtube.com/watch?v=fKSOoZ2vhvo

I am using Mini-Whip homemade active antenna in this video.
Mini Whip is excellent and cheap DIY active antenna.
Especially for lower frequencies! (VLF up to lower HF bands)

Some people who report poor performance of this antenna did not followed the rules of proper installation!
Grounding the outer conductor (shield) of the coaxial cable has to be done properly!
Coaxial cable is part of Mini-Whip antenna and collect a lot of RF noise.
You can treat Mini-Whip antenna as a vertical antenna feeding at the top where the impedance is very high. Outer conductor of the coaxial cable must be grounded at the bottom of antenna, where the coaxial cable touching the ground, and the second grounding have to be done at the point just before coaxial cable entering in the house.
The RF isolating transformer is recommend also.
In that way receiver ground is not physically connected to antenna ground but it is galvanic isolated from outer shield of coaxial cable.
All this measures is not difficult to implement and cost almost no money, but the benefit is clear, noiseless VLF and HF reception!

Mini-Whip antenna must be placed as far as possible from houses, buildings and power lines!

Here is the link of my Youtube video, with schematics of the Mini-Whip and Power supply (power inserter, or Bias-tee for powering the antenna thru the coaxial cable):


https://www.youtube.com/watch?v=DiAO8tCtefc

More information on my web page: http://www.qsl.net/z33t/

Excellent DIY Receiving Antena for VLF up to 20 MHz. My Mini-Whip active antennas are based on PA0RDT design with minor modifications. You can see the schematic diagrams of Mini-Whip antenna and Power Supply Unit at the end of this video. In my other videos on YouTube, you can see how good are those mini antennas in comparison with others much bigger wire antennas. Here is link where you can see pictures from my Power inserter and RF common ground Isolator for Mini-Whip active antenna powering thru the coaxial cable:
https://drive.google.com/file/d/1LLf1...

https://drive.google.com/file/d/1iZI4...

https://drive.google.com/file/d/1HKs5...

Mini Whip is excellent and cheap DIY active antenna.
Especially for lower frequencies! (VLF up to lower HF bands)
Here is the link to my PDF article about Mini-Whip:

https://drive.google.com/file/d/0B7Bk...

Some people who report poor performance of this antenna did not followed the rules of proper installation!
Grounding the outer conductor (shield) of the coaxial cable has to be done properly!
Coaxial cable is part of Mini-Whip antenna and collect a lot of RF noise.
You can treat Mini-Whip antenna as a vertical antenna feeding at the top where the impedance is very high. Outer conductor of the coaxial cable must be grounded at the bottom of antenna, where the coaxial cable touching the ground, and the second grounding have to be done at the point just before coaxial cable entering in the house.
The RF isolating transformer is recommend also.
In that way receiver ground is not physically connected to antenna ground but it is galvanic isolated from outer shield of coaxial cable.
All this measures is not difficult to implement and cost almost no money, but the benefit is clear, noiseless VLF and HF reception!

Mini-Whip antenna must be placed as far as possible from houses, buildings and power lines!

Here is the link of my Youtube video, where you can see my homemade Mini-Whip antennas in my backyard:

https://www.youtube.com/watch?v=L-1V9t5tdhk

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2 years ago

That's Amazing.... Thanks for the upload

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Life_N_Times_of_Shane_T_Hanson

Yeah - a little bit of cleverness that exponetientates into a rather vast amount of cleverness. I am only getting into the LF and VLF receiver tech because where I live, thunderstorms can evolve out of a clear sky and be coming over zapping everything underneath them. I find it better to just run around unplugging everything - and to wait it out, until they pass. The weather radars are helpful, but so is a beside radio - running in AM with a clear space down low in the frequency band between stations - of which there are basically non left besides the community drive through town very short range AM stations.... usually run by cunts anyway.

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2 years ago

@Life_N_Times_of_Shane_T_Hanson: It seems no matter where you go and what you do, these damn Cunts just show up! LOL! But these kinds of techniques will always be useful to have. By the looks of things, going analog seems like a safe bet...

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Life_N_Times_of_Shane_T_Hanson

Most of the rado frequency punch of a lightening strike is way below the AM band... in the 10 to 100 Khz frequency- so hooking up an antenna to a computers sound card is about as good as it gets in terms of simplicity and ease. Sure there are some really amazingly amazing software and interest groups and systems etc... but a simple "BZZZZTTTTT" over the raido suffices. The weather bureau tells me when the thunderstorms are likely to arrive and the weather radar shows me when and where they are, and what direction they are travelling - but these are things you kind of have to keep tuned into.... where as a receiver sits there using very little power and it's a 24/7 monitor, and when I hear the crackling of the lightening stikes then I can look up where it is and which way it's headed. I expect a 2 AM antenna set up 90* out of alignment with a sound card, or the miniature whip antenna, will work fine. As far as unplugging everything when a sizzler floats over - it takes 2 minutes to unpluge everything from the mains, and yet who in the hell can afford to replace it if there is a direct lightening strike, and in terms of earning capacity - say there is $1000 of damage, it only takes 2 minutes to unplug everything and 2 minutes to plug it all back in... can you earn $1000 in 4 minutes? Nope - I am unplugging.

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Life_N_Times_of_Shane_T_Hanson

Most of the rado frequency punch of a lightening strike is way below the AM band... in the 10 to 100 Khz frequency- so hooking up an antenna to a computers sound card is about as good as it gets in terms of simplicity and ease. Sure there are some really amazingly amazing software and interest groups and systems etc... but a simple "BZZZZTTTTT" over the raido suffices. The weather bureau tells me when the thunderstorms are likely to arrive and the weather radar shows me when and where they are, and what direction they are travelling - but these are things you kind of have to keep tuned into.... where as a receiver sits there using very little power and it's a 24/7 monitor, and when I hear the crackling of the lightening stikes then I can look up where it is and which way it's headed. I expect a 2 AM antenna set up 90* out of alignment with a sound card, or the miniature whip antenna, will work fine. As far as unplugging everything when a sizzler floats over - it takes 2 minutes to unpluge everything from the mains, and yet who in the hell can afford to replace it if there is a direct lightening strike, and in terms of earning capacity - say there is $1000 of damage, it only takes 2 minutes to unplug everything and 2 minutes to plug it all back in... can you earn $1000 in 4 minutes? Nope - I am unplugging.

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