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 25389 Views	December 01, 2014, 1623 UTC by Token
All 1 PPS pip / pulse / tick logs here please Started by GC « 1 2 3 4 5 6 7 8 9 10 »	138 Replies 112321 Views	December 10, 2021, 1855 UTC by Josh
Mystery signal question Started by jcwilshire « 1 2 3 4 5 »	67 Replies 105569 Views	November 27, 2018, 1340 UTC by ChrisSmolinski
9024 kHz, DSB, oddity, 03 April, 2020, 0420 UTC Started by Token « 1 2 3 4 »	49 Replies 32959 Views	May 04, 2020, 1326 UTC by Token
2 PPS 0130 UTC 29 Nov 2018 Started by Boriken « 1 2 »	23 Replies 17298 Views	December 08, 2018, 0308 UTC by Exo
Need help on multi-tone signal ID Started by caylorman « 1 2 »	19 Replies 16213 Views	January 24, 2021, 1637 UTC by liduck
White Noise Hump 6890 K 2/5/2022 0017UTC Started by JustGreg « 1 2 »	17 Replies 10839 Views	August 12, 2022, 0302 UTC by ~SIGINT~
Strange data (?) signal on 6860 kHz Started by WA4FHY	14 Replies 49494 Views	April 04, 2026, 0648 UTC by tiNG
UNID 5100-5140, 320z Strange data transmission Started by RadRoadrunner	12 Replies 12648 Views	August 03, 2016, 0342 UTC by MDK2
60 kHz wide signal centered on 6890 kHz 22:45UTC 1/7/2019 Started by CaptnKliegle	12 Replies 10198 Views	October 20, 2026, 2357 UTC by DYGradio
UNID "Time Signal" at 7475 in AM mode Started by Strange Beacons	11 Replies 7152 Views	January 03, 2020, 1638 UTC by KM0NAS
Data transmission 4.997 to 5.005 MHz Started by Mixer	11 Replies 7514 Views	April 04, 2020, 0102 UTC by Token
UNID HFDL Like Signals 5-9 MHZ - Some with CW Started by ultravista	10 Replies 6907 Views	June 27, 2018, 2109 UTC by Josh
New RADAR appearing all over lower HF bands recently Started by CaptnKliegle	9 Replies 11687 Views	December 11, 2018, 0805 UTC by n3ckf
UNID 13925-13975 UTE? Digital? 2354 UTC 16 July 2021 Started by RobRich	9 Replies 5807 Views	July 18, 2021, 2015 UTC by ~SIGINT~
UNID 6988 USB 2223 UTC 09 DEC 2021 Started by ~SIGINT~	9 Replies 6428 Views	January 11, 2022, 2306 UTC by ~SIGINT~
UNID 6943/6950 6963/6970 BINARY FSK 0130 UTC 14 MAY 2026 sounds like CW Started by TrueNorthSWL	9 Replies 10186 Views	July 18, 2026, 0314 UTC by TrueNorthSWL
UNID beeping, 13560 kHz AM, 4/7/16 0224 UTC Started by MDK2	8 Replies 8125 Views	August 31, 2016, 0752 UTC by CrackedLCD
UNID 8000 kHz 1434 UTC 10 Jan 2019 signal Started by IQ_imbalance	8 Replies 6830 Views	January 11, 2019, 1911 UTC by Josh
UNID 7000 UNID Mode 0117 UTC 28 JUL 2022 Started by ~SIGINT~	8 Replies 5705 Views	August 01, 2022, 1701 UTC by Token

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