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
READ THIS BEFORE POSTING, what this board is, and getting the most out of it Started by Token	0 Replies 14694 Views	December 01, 2014, 1623 UTC by Token
11 meters mystery - solved. Started by 45auto	5 Replies 4355 Views	March 04, 2020, 1141 UTC by ChrisSmolinski
Digital Signals around CB channels 24 & 25 LSB - 27235Mhz and 27245Mhz Started by 5150	3 Replies 10632 Views	July 19, 2025, 1552 UTC by alain
11414 UNID Mystery 1430 UTC Started by Aitrius	2 Replies 2970 Views	October 17, 2023, 1521 UTC by Aitrius
5 kHz bursts, 9 times per 10s, all over HF, deviating ±5 kHz around center freq Started by Alain4S	4 Replies 2615 Views	August 28, 2022, 0612 UTC by redhat
10920 kHz USB Numbers Started by AlakazamExe	1 Replies 2482 Views	November 12, 2020, 1337 UTC by JCMaxwell
Very short pips (mostly double; some single), 4 second interval, numerous freqs Started by alleycat	3 Replies 3356 Views	April 02, 2021, 0014 UTC by Dag
6505 kHz digital signal - mixed modes Started by alleycat	4 Replies 3756 Views	February 01, 2021, 0934 UTC by QRP
Unid 11318 dig (2-second bursts preceded by short tone) Started by alleycat	3 Replies 2489 Views	April 12, 2022, 0037 UTC by CoryD81
7040 kHz - 5 second bursts, 150 kHz bandwidth Started by alleycat	2 Replies 2978 Views	March 14, 2021, 2058 UTC by alleycat
Amateur mode 3596 kHz - FSK? Started by alleycat	3 Replies 3156 Views	May 04, 2022, 1937 UTC by Josh
2 kHz-wide (24-tone?) bursts 6961 kHz on 2020-01-23 at 0050z Started by alleycat	0 Replies 2458 Views	January 24, 2021, 2010 UTC by alleycat
7939 @ 0350z - analog? digital? SigIDWiki fails me again! Started by alleycat	2 Replies 2454 Views	April 03, 2022, 0301 UTC by alleycat
Marker? On 18.1025 MHz [EDITED] Started by alleycat	3 Replies 3513 Views	November 12, 2020, 0112 UTC by alleycat
PSK? narrowband signal at 5358.62 kHz Started by alleycat	3 Replies 2430 Views	December 30, 2022, 0536 UTC by ~SIGINT~
Resources to ID VHF/UHF sigital signals? Started by alleycat	0 Replies 2501 Views	February 20, 2021, 1452 UTC by alleycat
6815-6865 kHz 0120z on 22 Sep 2020 (OTH radar?) Started by alleycat	0 Replies 2130 Views	September 22, 2020, 0138 UTC by alleycat
Amateur mode 7040kHz PSK variant? Started by alleycat	2 Replies 7388 Views	January 03, 2025, 1926 UTC by RAH
8 kHz wide bursts on HF - probably a common one... Started by alleycat	3 Replies 3294 Views	December 27, 2020, 1334 UTC by Token
Natural phenomenon? Started by alleycat	3 Replies 3485 Views	December 05, 2020, 2336 UTC by alleycat

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