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
Interesting sound, it gets scaled out to cover more frequency Started by Antennae	5 Replies 5431 Views	May 06, 2015, 0412 UTC by Antennae
Need help on multi-tone signal ID Started by caylorman « 1 2 »	19 Replies 5254 Views	January 24, 2021, 1637 UTC by liduck
UNID beeping, 13560 kHz AM, 4/7/16 0224 UTC Started by MDK2	8 Replies 5085 Views	August 31, 2016, 0752 UTC by CrackedLCD
MOVED: SSTV 6940 kHz USB 0348Z Started by Token	0 Replies 4542 Views	August 14, 2015, 1546 UTC by Token
Pulsating - feedback signal on 13236khz @ 0130 UTC 28/7/15 Started by mr magoo	2 Replies 4526 Views	July 29, 2015, 1834 UTC by mr magoo
UNID 17510 USB 1530 UTC 5/12/2016 Started by flexoman61	0 Replies 4443 Views	May 12, 2016, 1549 UTC by flexoman61
Mystery ute on 6135 kHz Started by Treehouse SWL	5 Replies 4346 Views	February 14, 2019, 0054 UTC by Token
UNID 6925 kHz 0232-0235 03-14-16 Started by vhavrilko	7 Replies 4305 Views	March 15, 2016, 1647 UTC by Token
28188.55khz 1609UTC 06-27-2016 weird data (to me anyways) Started by ka1iic	2 Replies 4266 Views	June 30, 2016, 1600 UTC by ka1iic
6975 KHZ wideband noise messing up my listening Started by ka1iic	4 Replies 4215 Views	January 04, 2016, 0326 UTC by EliteData
Cross-hatch Radar on 14950cf in Japan Started by nickcarr	0 Replies 4209 Views	January 15, 2016, 1132 UTC by nickcarr
No Idea What This Is Started by Matt_B	3 Replies 4104 Views	February 14, 2019, 0136 UTC by N2NXZ
an oddity centered at 4685Khz Started by TheRelayStation	1 Replies 4006 Views	April 09, 2019, 0004 UTC by HarryHydro
UNID 9000 kHz 1914 UTC 11 Jan 2019 Started by IQ_imbalance	7 Replies 3985 Views	January 12, 2019, 2038 UTC by Josh
UNID 8000 kHz 1434 UTC 10 Jan 2019 signal Started by IQ_imbalance	8 Replies 3940 Views	January 11, 2019, 1911 UTC by Josh
MOVED: Inquiry FSK signal on or around 6948 Started by Token	0 Replies 3917 Views	May 15, 2015, 0417 UTC by Token
UNID mode 6890 kHz 12 Aug 2017 2145 UTC Started by ulx2	3 Replies 3911 Views	September 20, 2017, 1139 UTC by ulx2
6.969Mhz - 24Khz deviation WFM Started by EliteData	3 Replies 3814 Views	March 04, 2016, 0204 UTC by Josh
UNID 6250.00 USB 4/10/2016 850 UTC Started by CaptainGreenBeans	5 Replies 3761 Views	April 12, 2016, 2017 UTC by myteaquinn
Long Dashers, possibly similar to Pips Network, multiple frequencies, March 2020 Started by Token	6 Replies 3690 Views	April 04, 2020, 1603 UTC by KM0NAS

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