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.

Pages: 1 2 3 4 5 6 7 8 9 [10] 11 12 13 14 15

Subject / Started by	Replies / Views	Last post
Pulsating - feedback signal on 13236khz @ 0130 UTC 28/7/15 Started by mr magoo	2 Replies 4511 Views	July 29, 2015, 1834 UTC by mr magoo
QRM on 13560 kHz Started by skeezix	1 Replies 6296 Views	March 01, 2015, 0411 UTC by Token
Repeating signal, 8992 kHz, every 3 minutes, 15 second duration Started by Dag	1 Replies 1131 Views	February 27, 2022, 0244 UTC by ~SIGINT~
Resources to ID VHF/UHF sigital signals? Started by alleycat	0 Replies 1006 Views	February 20, 2021, 1452 UTC by alleycat
Rtty looking signal 4280kHz at UTC: 1420 Europe Started by greator	1 Replies 1773 Views	June 26, 2020, 0104 UTC by Token
Russian Buzzer 4625KHz 2308 21 March 2022 Started by JustGreg	2 Replies 1243 Views	March 22, 2022, 1325 UTC by JustGreg
Russian Mystery Military Station - The Alarm Started by ~SIGINT~	0 Replies 2088 Views	December 08, 2021, 0022 UTC by ~SIGINT~
Scrambled 21.2 MHz HF Comms out of Europe? Started by Sky	2 Replies 1048 Views	May 30, 2023, 1540 UTC by ~SIGINT~
Signals around the Russian Buzzer Started by JustGreg	6 Replies 1632 Views	May 04, 2022, 1925 UTC by Josh
Something interesting on HF maybe be related to our mystery 1 PPS UNID time tick Started by GC	5 Replies 2576 Views	June 10, 2018, 0049 UTC by CaptnKliegle
Sounder or radar or.. Started by dollydot	3 Replies 2247 Views	October 15, 2018, 1951 UTC by dollydot
Standalone Carrier, 6970; 2/1/17, 22:40 UTC Started by RadRoadrunner	0 Replies 1573 Views	February 01, 2017, 2248 UTC by RadRoadrunner
Strange Behavior Near 20KHz Started by K5KNT	2 Replies 5635 Views	February 06, 2016, 2342 UTC by ChrisSmolinski
Strange data (?) signal on 6860 kHz Started by WA4FHY	0 Replies 1454 Views	March 28, 2021, 0411 UTC by WA4FHY
Strange signal on 5174 kHz Started by Freqs	2 Replies 2440 Views	February 10, 2017, 1853 UTC by Token
Strange signal on the 40 meter band at 7035.50 kHz Started by Strange Beacons	4 Replies 3370 Views	December 18, 2018, 0023 UTC by Strange Beacons
The Swath 7880 (C) 0028 UTC 19 DEC 2022 Started by ~SIGINT~	0 Replies 828 Views	December 19, 2022, 0038 UTC by ~SIGINT~
Two Tone Beeps Started by swl22	0 Replies 974 Views	July 01, 2023, 2201 UTC by swl22
UNID 12151 USB 0817 UTC 19 July 2022 Started by TRI International	0 Replies 769 Views	July 19, 2022, 0820 UTC by TRI International
UNID 4649.5 USB 1530 UTC 26 FEB 2022 Started by TRI International	4 Replies 1118 Views	February 27, 2022, 0255 UTC by Dag

Pages: 1 2 3 4 5 6 7 8 9 [10] 11 12 13 14 15

Normal Topic
Hot Topic (More than 15 replies)
Very Hot Topic (More than 25 replies)

Locked Topic
Sticky Topic
Poll

News: