SAQ transmission tomorrow July 5th, 2026 on 17,2 kHz.
For more information, please see here:
https://alexander.n.se/saq-scheduled-to-air-on-alexanderson-day-july-5th-2026/
#vlf — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #vlf, aggregated by home.social.
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Due to the initial antenna connection problem, I missed the tuning-up, but most of today's SAQ is here. A strong, ~S7 signal today, with a clear signal from the carrier during key-up times.
Frequency control was excellent today, well within the design +/-10Hz. Given it's an electromechanically-regulated spinning metal disc, this is always pretty amazing!
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24 December 2025: The Very Low Frequency (VLF) transmitter from Grimeton (Sweden) with the call sign SAQ goes on air. Is it possible to receive this transmitter with simple means in the city of Bern? Yes, it is possible.
Antenna: (DIY) three ferrite rods wound with HF litz wire.
DIY up-converter.
Degen DE1103 receiver.
The signal was weak, but it was still possible to copy it. -
Cold War VLF and a Bob’s Homemade “LWL” QSL Card
https://swling.com/blog/2025/12/cold-war-vlf-and-a-bobs-homemade-lwl-qsl-card/
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Tonight I'll play a new work, Radio Strata in Esc Gallery - Graz.
It is a journey in radio recordings I've made, from cosmic sources towards Earth, passing through satellites.
Come for the ending of the "Out of Control" exhibition! More infos here:
https://esc.mur.at/en/projekt/out-control
(Big thx to @reni )
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Radio Apocalypse: Survivable Low-Frequency Communication System https://hackaday.com/2025/11/12/radio-apocalypse-survivable-low-frequency-communication-system/ #verylowfrequency #RadioApocalypse #lowfrequency #missile #radio #SLFCS #News #EAM #emp #vlf #LF
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UN Day 2025 SAQ Grimeton VLF transmitter - 14:00 UTC
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Optimizing VLF Antennas - Using digital techniques has caused a resurgence of interest in VLF — very low fre... - https://hackaday.com/2025/09/04/optimizing-vlf-antennas/ #loopantenna #radiohacks #antenna #vlf
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METEOR ECHO, France, 10th August.
Every year, in early August, the Earth passes through the debris field left behind by a comet. Its dust burns up as it enters the atmosphere at high speed, creating trails that streak across the sky. For a brief moment, these shooting stars create a reflective effect for certain radio waves. It is then possible to “hear” the shooting star.
A special antenna and radio have been set up in Saint-Chels, France the 10th August, tuned to the frequency of a powerful radar located in Dijon.
Sporadically, a sound emerges from the noise: it is the rebound on the shooting star of the wave emitted in Dijon that reaches us.
By revealing this energy that passes through us, this device manifests the tenuous but tangible connection that links us to the star. A radio-astrology of micro-listening, which projects us toward the night sky, even when the full moon prevents us from observing it closely...
Thanks Samia El hadj for the help and Laurie Anne Estaque for the drawing
#meteor #vlf #radar #sdr #meteorshower #radioart #meteorscatter
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The VLF Transformation - People have long been interested in very low frequency (VLF) radio signals. But it... - https://hackaday.com/2025/08/19/the-vlf-transformation/ #wirelesshacks #loopantenna #hamradio #vlf
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Earthquake
The huge M8.8 earthquake at Kamchatka Peninsula last night not only shook the earth. It also generated gravity waves in the atmosphere which echoed around the world, causing the ionosphere to oscillate too.
Amateur DXers around the world have detected variations in the signal strength and Doppler shifts of HF (3-30 MHz) and VLF (3-30 kHz) radio stations shortly after the earthquake occurred. Some signal plots are attached from 7L4IOU and F5VLB (via the "Dopplergram" Google group).
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Lovely sunny, cool morning for listening-out for SAQ, 17.2kHz, at 08:20UT.
You did remember, right?
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Time to get your SDRs tuned-up to 17.2kHz again...
https://www.youtube.com/live/JJb_RdKX4qc?si=EUGiptiOb7OCqjU1
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Was für eine Scheißnacht :-/ aber mit Grillen und SAQ wird alles besser :) #amateurfunk #hamradio #alexanderson #SAQ #VLF
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Well, in north Wales, at least, the weather is looking OK-ish for being out in the woods, in the dark, with a 38m-long coax loop hung from the trees for the next SAQ event!
https://alexander.n.se/saq-to-air-on-christmas-eve-morning-dec-24th-2024/
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Six days before the next SAQ transmission!
Maybe someone can stick the reminder on QRZ.com for me? I'm fed up of logging in every time I look at it!🙏
https://alexander.n.se/en/saq-to-air-on-christmas-eve-morning-dec-24th-2024/
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Christmas Eve treat for all us VLF fanatics!
https://alexander.n.se/en/saq-to-air-on-christmas-eve-morning-dec-24th-2024/