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
what are all these blips between the 20m and 19m bands? Started by Dr. Amp	0 Replies 3972 Views	October 22, 2024, 1818 UTC by Dr. Amp
giant ~50kHz wide signal centered on 13.936 Started by Dr. Amp	1 Replies 4477 Views	October 28, 2024, 2340 UTC by Token
Altrenating buzz, knocks, etc Started by Dr. Dickie	4 Replies 5192 Views	February 27, 2020, 2328 UTC by Dr. Dickie
Horn sounds 7160 USB 3:35 UTC 12/08/2019 Started by dragund	0 Replies 3209 Views	December 08, 2019, 0342 UTC by dragund
mystery sig. 6.945 Started by dustyroy243	2 Replies 4145 Views	September 16, 2016, 1350 UTC by EliteData
UNID Time Signal 6930 kHz USB 0535 utc 10 March 2024 Started by Edgar Souse	0 Replies 2839 Views	March 10, 2024, 0538 UTC by Edgar Souse
8956khz Aug 4 02:37utc Started by Edgar Souse	7 Replies 35281 Views	September 27, 2019, 2110 UTC by Josh
6.969Mhz - 24Khz deviation WFM Started by EliteData	3 Replies 6137 Views	March 04, 2016, 0204 UTC by Josh
"RFID Devices" 13560 (?) 1559 UTC 3 FEB 2022 Started by Erik Mattson	4 Replies 5225 Views	February 23, 2022, 1403 UTC by NJQA
Probably not a mystery, but is it just me? Started by Erik Mattson	3 Replies 6600 Views	December 17, 2024, 0258 UTC by Erik Mattson
UVB-76 Started by Erik Mattson	0 Replies 3027 Views	January 28, 2022, 0453 UTC by Erik Mattson
Goose-like 3510 USB 0034 utc 12th Apr 2021 Started by Ethernut	0 Replies 3486 Views	April 12, 2021, 0036 UTC by Ethernut
UNID 17510 USB 1530 UTC 5/12/2016 Started by flexoman61	0 Replies 6458 Views	May 12, 2016, 1549 UTC by flexoman61
UNID mode 13935 usb 1545 UTC 14 NOV 2015 Started by flexoman61	3 Replies 4831 Views	December 31, 2015, 1549 UTC by flexoman61
Strange signal on 5174 kHz Started by Freqs	2 Replies 4265 Views	February 10, 2017, 1853 UTC by Token
Something interesting on HF maybe be related to our mystery 1 PPS UNID time tick Started by GC	5 Replies 5043 Views	June 10, 2018, 0049 UTC by CaptnKliegle
UNID 12185 kHz 25kHz wideband transmission Started by GC	3 Replies 4890 Views	July 15, 2018, 1332 UTC by Token
UNID wideband signal 13995.6 kHz Started by GC	6 Replies 5027 Views	July 15, 2018, 2006 UTC by GC
All 1 PPS pip / pulse / tick logs here please Started by GC « 1 2 3 4 5 6 7 8 9 10 »	138 Replies 112275 Views	December 10, 2021, 1855 UTC by Josh
PIPs 2018-04-19 22:45 UTC Started by GC	5 Replies 4734 Views	April 20, 2018, 2353 UTC by GC

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