HF Mystery Signals

We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissible in your locale.

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Subject / Started by	Replies / Views	Last post
Goose-like 3510 USB 0034 utc 12th Apr 2021 Started by Ethernut	0 Replies 3486 Views	April 12, 2021, 0036 UTC by Ethernut
MOVED: The Siren or Alarm sound at 4770KHz Started by Token	0 Replies 3497 Views	December 08, 2020, 0401 UTC by Token
UNID Digital signal around 6030usb 2230 UTC June 15 Started by TheFlaminFire	3 Replies 3509 Views	June 16, 2018, 1635 UTC by Josh
Merging all 1 PPS pip / pulse / tick logs Started by Token	1 Replies 3535 Views	June 23, 2018, 1539 UTC by GC
Writing on the spectrum analyser Started by k1dexterity	2 Replies 3538 Views	March 13, 2022, 2233 UTC by Stretchyman
10790 wideband data? July 2/3 2018 Started by PresentedIn4D	0 Replies 3540 Views	July 03, 2018, 0547 UTC by PresentedIn4D
8130 USB 2323 UTC 09 Feb 2017 Started by refmo	2 Replies 3552 Views	February 10, 2017, 1847 UTC by Token
Unidentified Signal, 11591 kHz, 19 March 2018 1817 UTC Started by K5KNT	1 Replies 3552 Views	April 02, 2018, 1358 UTC by Token
2 kHz-wide (24-tone?) bursts 6961 kHz on 2020-01-23 at 0050z Started by alleycat	0 Replies 3576 Views	January 24, 2021, 2010 UTC by alleycat
Scrambled 21.2 MHz HF Comms out of Europe? Started by Sky	2 Replies 3584 Views	May 30, 2023, 1540 UTC by ~SIGINT~
MFA Moscow - X06 15920 USB 0510 UTC 28 JUL 2023 Started by ~SIGINT~	2 Replies 3590 Views	July 29, 2023, 0156 UTC by ~SIGINT~
Repeating signal, 8992 kHz, every 3 minutes, 15 second duration Started by Dag	1 Replies 3609 Views	February 27, 2022, 0244 UTC by ~SIGINT~
Open Carrier 6715 kHz 1939 UTC 24 Jul 2018 Started by ChrisSmolinski	4 Replies 3616 Views	July 25, 2018, 1831 UTC by Josh
UNID 7508 kHz 12 Oct 2017 0145 UT Started by Boriken	1 Replies 3619 Views	October 13, 2017, 1714 UTC by Josh
Beacon network logging 10/1/20 16:17z Started by n0xu	2 Replies 3620 Views	October 01, 2020, 1636 UTC by VBRadio
MOVED: What is this Stanag around 4810 kHz from? Started by Token	0 Replies 3633 Views	September 21, 2019, 1442 UTC by Token
around 6297 mystery signal Started by bumbelstock	1 Replies 3639 Views	November 03, 2017, 2303 UTC by Token
Resources to ID VHF/UHF sigital signals? Started by alleycat	0 Replies 3644 Views	February 20, 2021, 1452 UTC by alleycat
6934 kHz LSB UNID - 0135 UTC 13-DEC-2024 Started by Gr0undPlan3	0 Replies 3645 Views	December 13, 2024, 0142 UTC by Gr0undPlan3
OTHR? Started by ChrisSmolinski	2 Replies 3656 Views	January 11, 2017, 2209 UTC by ChrisSmolinski

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