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In previous articles i’ve shown some typical ZEVS messages , and an analysis of the amount of messages per day .
This repository has all of the scripts used during the analysis: https://github.com/sq5bpf/zevs-analysis
So what more could we get out of the opublished ZEVS dataset ?
In the last article i’ve written about a method of automatically finding ZEVS trasmissions, and an analysis of it’s messages: Analysis of ZEVS messages
Luckiny i have data from 25 August 2021 until now. Using it i can check if anything has changed during the Russian invasion of Ukraine in 2022.
These are encrypted military messages. So there is no reason to analyze them, right? 🙂
Continue reading “An analysis of ZEVS messages during the russian invasion in Ukraine in 2022”
Russia uses radiocommunications in the ELF band to send messages to it’s nuclear submarine fleet. This transmitter it called ZEVS, the frequency is 82Hz (yes: hertz, not kilohertz, not megahertz). For more info see here: http://www.vlf.it/zevs/zevs.htm
I’ve installed a grabber on the KLUBNL.PL page showing the spectrum around 82Hz. It is available here: https://klubnl.pl/wpr/index.php/klubnl-pl-grabbers/grabber-zevs-82hz/
This grabber calculates the spectrum in 80-84Hz every 60 seconds, and makes spectrograms out of it. The files with the spectrum information are not deleted, so out out of coincidence i have a history of data from 25 August 2021 until now (around 10 June 2022).
And since i have this data, it would be nice to do an analysis how the messages to the submarine fleet look like, and how often are they transmitted.
We have published data from observations of the ELF spectrum 80-84Hz (ZEVS) over a period of a few months.
The data is avaliable here: https://klubnl.pl/zevs/
In 2019 i’ve written that the SQ5BPF grabbers will be temporarily offline and should return in winter 2019. Unfortunately this “moment” got extended to august 2021.
Now, finally, I’m trying to reactivate them, The VLF antenna has been installed again. For now I’ve activated the ZEVS 82Hz and VLF 8270Hz grabbers. Because of changes in vlfrx-tools noiseblanker from versions 0.6 to 0.9, i will be trying to find the parameters for best reception, so please stay tuned, the grabbers might not be operating at their best right now.
The rest of the grabbers will be activated shortly.
As before, i’m recording the while 0-24kHz bandwidth, and keeping the recordings for a few days. They can be provided to interested parties upon request (for scientific reasons etc).
The russian 82Hz ZEVS transmitter stopped working on April 4 2018 around 12:00 UTC, and so far hasn’t resumed operation (this is written on 15 April, 11 days later).
Spectrogram of the end of transmission:
ZEVS can be monitored on the klubnl.pl ZEVS grabber:
I’ve added a 82Hz grabber: Grabber ZEVS 82Hz
The Russian ZEVS station is probably transmitting on 82Hz. More information about the station here:
http://www.vlf.it/zevs/zevs.htm
https://en.wikipedia.org/wiki/ZEVS_%28transmitter%29 Continue reading “ZEVS on 82Hz or strange carriers on ELF”