#vlf — Public Fediverse posts

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/

#SAQ #VLF

Looking for #recommendations for #usb #wideband #radio #receiver please. Interested in #VLF up to a few #GHz, mostly want to hear #sferics, #hamradio, #shortwave, #solar, #jovian and any curiosities besides.

Would one single #SDR receiver span all that comfortably? Could it be used with some sort of computer visualisation software to watch the passband go by over time?

Got my #RSGB M-class callsign over 20 years ago, now curious about RF again :)

TYVM

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!

https://youtu.be/E-qUdiLyUoA?si=Fy-s_2eXOdnR8-EB

#VLF #wireless #radio #heritage

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/

#BobK7ZB #LWLQSL #QSLCards #VLF

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

UN Day 2025 SAQ Grimeton VLF transmitter - 14:00 UTC

https://www.youtube.com/watch?v=GJ8cY0s7sxw

#amateurradio #SAQ #Grimeton #VLF

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

The VLF Transformation https://hackaday.com/2025/08/19/the-vlf-transformation/ #WirelessHacks #loopantenna #hamradio #vlf

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

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).

https://www.7l4iou.com/2025/07/8006khzpm95wr2025-07-29.html

#earthquake
#kamchatka
#vlf

Lovely sunny, cool morning for listening-out for SAQ, 17.2kHz, at 08:20UT.

You did remember, right?

#saq #vlf #wirelesss #radio

Time to get your SDRs tuned-up to 17.2kHz again...

https://www.youtube.com/live/JJb_RdKX4qc?si=EUGiptiOb7OCqjU1

#saq #vlf #wireless #amateurradio

Was für eine Scheißnacht :-/ aber mit Grillen und SAQ wird alles besser :) #amateurfunk #hamradio #alexanderson #SAQ #VLF

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/

#hamradio #radio #vlf

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/

#saq #vlf

Christmas Eve treat for all us VLF fanatics!

https://alexander.n.se/en/saq-to-air-on-christmas-eve-morning-dec-24th-2024/

#saq #vlf