[TangerineSDR] VLF-RX tools
emuman100 at gmail.com
Wed Mar 10 22:12:03 EST 2021
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
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
vtwavex - extract a wav file from a VLF stream. This also removes the
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
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
> 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
> -- Tom, N5EG
> n5eg at tapr.org
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