VLF grabbers reactivation at Warsaw / SQ5BPF
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...
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RSDN stations are active again
After a long period of inactivity the RSDN stations are active again. Right now (12 october 2021) three frequencies are active: 11.9kHz, 12.65kHz, 14.88kHz. This is a hyperbolic navigation system,...
View ArticleSAQ Christmas 2021 transmission on 17.2 kHz
Christmas transmission from SAQ on 17.2kHz, 24 December 2021 8:00 UTC Received at SQ5BPF QTH Warsaw/Poland KO02md. E-field active antenna, vlfrx-tools and Spectrum Lab receiver. On the recording one...
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Data from ELF 82-84Hz observations over a few months has been published
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/ Example ZEVS transmission
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Analysis of ZEVS messages
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...
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An analysis of ZEVS messages during the russian invasion in Ukraine in 2022
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...
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Analyzing ZEVS part 2 – 82.0Hz
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:...
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View ArticleSAQ transmission on 1 December 2024 commemorating 100 years of commecrial...
The VLF radiostation on Grimeton/Sweden with the callsign SAQ was put into commecrial service on 1 December 1924. SAQ was a transatlantic station. The main correspondent were stations in Long Island,...
View ArticleSAQ centennial transmission on 1 December 2024
On 1 December 1924 the SAQ station SAQ has started handling commercial telegraph traffic. On 1 December 2024 a message was sent commemorating the 100 years anniversary. Reception at Marcin SQ2BXI...
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