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Author Topic: The Siren or Alarm sound at 4770KHz  (Read 1316 times)

Offline Perseus68

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The Siren or Alarm sound at 4770KHz
« on: December 06, 2020, 2200 UTC »
Quite well audible those nights, at least from my QTH (canary islands).
It was already known from the SDR of Twente (The Netherlads)
I grabbed a couple of videos just in case your are interested.

https://youtu.be/o1le0EfnDjI

https://youtu.be/TDJBvGg7pto

Gear: SDRPlay-RSP1 + SDRUno + Home-made 1m diameter active Loop

Offline Teotwaki

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Re: The Siren or Alarm sound at 4770KHz
« Reply #1 on: December 19, 2020, 0239 UTC »
Thanks for recording that! It is very fascinating!
Jim
NRD-525, Elecraft KX3 and Elecraft PX3 Spectrum Display
76' end fed long wire & 66' off-center fed dipole for 10/20/40 meters
Orange County, SoCal, The better half

Offline jasmine

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Re: The Siren or Alarm sound at 4770KHz
« Reply #2 on: January 08, 2021, 1250 UTC »
Quite well audible those nights, at least from my QTH (canary islands).
It was already known from the SDR of Twente (The Netherlads)
I grabbed a couple of videos just in case your are interested.

https://youtu.be/o1le0EfnDjI

https://youtu.be/TDJBvGg7pto

Gear: SDRPlay-RSP1 + SDRUno + Home-made 1m diameter active Loop

This is "The Alarm"

Thought to be used by the Russian Army Western Military District:  https://priyom.org/military-stations/russia

More info here: https://priyom.org/military-stations/russia/the-alarm
« Last Edit: January 08, 2021, 1252 UTC by jasmine »
SDRPlay RSP1a, Airspy HF+Discovery, Malahit Clone with v1.10D & MLA-30+ Magnetic Loop Antenna