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
UNID ~10,600 – 12,400 kHz Started by WA4FHY	4 Replies 4578 Views	February 12, 2020, 2007 UTC by Josh
MOVED: 6248khz LSB 0050z - 0110z 2/9/20 Started by ChrisSmolinski	0 Replies 1497 Views	February 11, 2020, 1345 UTC by ChrisSmolinski
UNID "Time Signal" at 7475 in AM mode Started by Strange Beacons	11 Replies 4263 Views	January 03, 2020, 1638 UTC by KM0NAS
Horn sounds 7160 USB 3:35 UTC 12/08/2019 Started by dragund	0 Replies 2018 Views	December 08, 2019, 0342 UTC by dragund
What is this 50kHz wide digital signal on 6925? Started by chanito	3 Replies 2441 Views	December 03, 2019, 1947 UTC by Josh
7335 and 7365kHz CW? 20191116 0216 UTC to ??? Started by IQ_imbalance	0 Replies 1804 Views	November 16, 2019, 1614 UTC by IQ_imbalance
MOVED: Chinese programming on 11170 kHz Started by Token	0 Replies 2786 Views	October 21, 2019, 0246 UTC by Token
6 Second Ditter (?) 26 Sept 2019 Correction: "Pips Network" Started by ka1iic	4 Replies 3116 Views	September 30, 2019, 1936 UTC by Boriken
Pips on 7725 30 Sep 2019 1500 UTC Started by Boriken	0 Replies 1665 Views	September 30, 2019, 1533 UTC by Boriken
one second dit stations Started by ka1iic	0 Replies 1889 Views	September 28, 2019, 0421 UTC by ka1iic
8956khz Aug 4 02:37utc Started by Edgar Souse	7 Replies 32857 Views	September 27, 2019, 2110 UTC by Josh
MOVED: What is this Stanag around 4810 kHz from? Started by Token	0 Replies 2383 Views	September 21, 2019, 1442 UTC by Token
(news story) UNID 28 MHz in Africa Started by RST111	0 Replies 2742 Views	September 12, 2019, 0323 UTC by RST111
UNID mode 16020 kHz approx. 0520 UTC 5 Aug 2019 Started by ulx2	0 Replies 17562 Views	August 07, 2019, 0551 UTC by ulx2
3 second ditter network 1605 UTC 24 Juil 2019 Started by ChrisSmolinski	1 Replies 31852 Views	July 24, 2019, 2151 UTC by ChrisSmolinski
UNID pips ~ 14220kHz 1337 UTC 7 June 2019 Started by IQ_imbalance	0 Replies 3262 Views	June 08, 2019, 1806 UTC by IQ_imbalance
frequency hopping set of repeating pulses Started by Ramonthebiker	1 Replies 4058 Views	May 09, 2019, 0109 UTC by Token
an oddity centered at 4685Khz Started by TheRelayStation	1 Replies 4550 Views	April 09, 2019, 0004 UTC by HarryHydro
carrier 14318 KHz Started by [tRMZ]	0 Replies 3321 Views	April 02, 2019, 1850 UTC by [tRMZ]
MOVED: 6974.4 CW Started by Token	0 Replies 3366 Views	March 02, 2019, 1627 UTC by Token