[TangerineSDR] VLF-RX tools

Jonathan emuman100 at gmail.com
Wed Mar 24 09:45:04 EDT 2021

Hi Bob,

Sorry for replying so late. The documentation does not really cover application in which vlfrx-tools is used. For that, please see https://www.n4vlf.net/vlfrx.html for the processing methodology. These tools are primarily suited for continuous capture from VLF receiver, timestamping, mains hum filtering, automated detection of events, and signal archival. The link I posted details a live system as an example how such a system is configured and set up. If you have any questions, please let me know. 


> On Mar 22, 2021, at 8:57 PM, Robert McGwier <rwmcgwier at gmail.com> wrote:
> Jonathan
> Is there a location for documentation that tells details on the processing methodology in the tools? 
> Thanks
> Bob
> Dr. Robert W McGwier, Ph.D.
> Adjunct Faculty, Virginia Tech
> ARDC Member of Board
>> On Wed, Mar 10, 2021, 9:59 PM Jonathan via TangerineSDR <tangerinesdr at lists.tapr.org> wrote:
>> Hi Tom,
>> Thank you for looking at the documentation for vlfrx-tools! I'll list some 
>> useful utilities included in vlfrx-tools to try to illustrate how useful 
>> they can be. A utility can be written to convert to DigitalRF/HDF5, 
>> however, vlfrx-tools does not normally generate IQ data.
>> For others on the list, the vlfrx-tools documentation is 
>> available at http://abelian.org/vlfrx-tools/ and this also includes the 
>> source code. Also, for the others on the list, I'd like to make the 
>> argument that vlfrx-tools is advantageous because of its useful toolset in 
>> analysis and post-processing of both natural radio, amateur radio in the 
>> VLF band, and VLF transmitters. Such tools don't exist (to my knowledge) 
>> for formats like DigitalRF. Since vlfrx-tools is such a diverse and 
>> usefull toolset that already exists, it's advantageous to utilize it in 
>> post-processing on the PSWS database to make available SID events, 
>> whistler and chorus events, and lightning location data, just to name a 
>> few.
>> vtblank - an impulsive noise blanker that removes sferics and other 
>> impulsive noise from the VLF spectrum. It's useful in studying VLF 
>> transmitters and especially useful for VLF QSOs.
>> vtam - used to extract the magnitude of a non-stationary signal like a 
>> sferic. You can examine the timing of sferics, whistlers, and the edges of 
>> timing signals like WWVB.
>> vtpolar - generate a polar plot movie of a triple axis VLF stream. This 
>> allows you to see the bearing of incoming VLF signals like whistlers. 
>> Please watch the movie in the documentation!
>> vtsid - automatically  detects sudden ionospheric disturbances with VLF 
>> transmitters like NAA. It generates a plot and a data file. The extraction 
>> utility can extract records from that data file.
>> vtevent - automatically detects whistlers and chorus and generates a 
>> spectrogram plot, data file, and audio file of the event.
>> vttoga - creates time of group arrival data from sferics the incoming VLF 
>> stream or a file.
>> vtspot - used to generate lightning location data from vttoga data from 
>> VLF receivers around the world. The PSWS database can provide lightning 
>> location data using a network of receivers.
>> vtping - used to detect meteor ping.
>> vtwrite - writes a VLF stream, either from a ring buffer or network 
>> socket, to file for storage.
>> vtread - reads a .vt file into a ring buffer or network socket.
>> vtraw - extract raw audio froma VLF stream. This also removes the 
>> timestamping.
>> vtwavex - extract a wav file from a VLF stream. This also removes the 
>> timestamping.
>> These are just some examples of useful utilities of vlfrx-tools. A utility 
>> to convert a .vt file to DigitalRF/HDF5 can be written (however, I cannot 
>> support that). Also, vlfrx-tools does not generate IQ data normally. But, 
>> with such a toolset, so much can done. I would hope this convinces some of 
>> those who may be skeptical. In any case, I urge you to look at the 
>> documentation.
>> Jonathan
>> On Wed, 10 Mar 2021, Tom McDermott via TangerineSDR wrote:
>> > Date: Wed, 10 Mar 2021 12:07:26 -0800
>> > From: Tom McDermott via TangerineSDR <tangerinesdr at lists.tapr.org>
>> > To: TAPR TangerineSDR Modular Software Defined Radio
>> >     <tangerinesdr at lists.tapr.org>
>> > Cc: Tom McDermott <tom.n5eg at gmail.com>
>> > Subject: [TangerineSDR] VLF-RX tools
>> > 
>> > Hi,  I don't have Jonathan Rizzo's direct email, so sending this to the
>> > list.
>> >
>> > We talked a bit about the VLF receiver on the last conference call, and the
>> > VLFRX tools.
>> > I'd like to email with Jonathan directly.   It appears those tools have the
>> > ability to
>> > read from a file (and thus in Linux from a named pipe).  Gnuradio can write
>> > to a named pipe
>> > as well to DigitalRF (HDF5).   Perhaps this may provide a mechanism to
>> > hook the receiver both to the Tangerine archiving method as well as to
>> > VLFRX.?
>> >
>> > -- Tom, N5EG
>> > n5eg at tapr.org
>> >
>> -- 
>> TangerineSDR mailing list
>> TangerineSDR at lists.tapr.org
>> http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org
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