This signal is an unconfirmed Morse code Oddity called UM10 by the Numbers and Oddities web site. The source is thought to be north eastern China, and its purpose is unconfirmed.
This is one of several different stations in this family of stations. Each station / source / schedule uses different frequencies and transmitted sequences of letters / numbers, which may be a callsign of sorts. In this case, the station transmits in 10 minute blocks, twice each hour, from 15 to 25 minutes after the hour and 45 to 55 minutes after the hour. It transmits the letters "HHN5" in Morse code, over and over. Other frequencies / schedules use other IDs and sometimes other time blocks. These stations act very much like beacons, but they do occasionally carry limited changing / dynamic traffic also. Credit to YT "First Token".Utility & Numbers Stations
Utility & Numbers Stations
This site is dedicated to HF short wave investigations & other signal identifications
Many of the radio reception recordings on this website pertain to unusual, uncommon, unknown, or mystery signals that might be found on radio, shortwave or VHF/UHF. Among the subjects covered are numbers stations, utility stations, military transmissions (both means in the clear and encrypted / encoded), aviation, maritime, ham radio, CB radio, radars, ionosodes, propagation beacons, ditters, dashers, whistlers, and just about anything else that might transmit, in any mode, USB, LSB, CW, Morse Code, FM, AM,FMCW, LFMCW, etc. etc. All the recordings are made by a team member. In other cases credits are mentioned, or © for copyright.
If you aren't a DXer or SWL or BCL or on the other hand: if you don't understand this words/shortcuts, then LEAVE THIS WEBSITE IMMEDIATELY ! You are not welcome ! No new visitors are exepected ! This Website is only and only for insiders of the shortwave hobby !
LEGAL ADVICE:
all recordings are completely legal. Within the EU, it is not forbidden to listen to and log analogue signals of any kind. This also applies to pirate stations. It's legal to listen to them!
Again: This Website is only and only for DX-Hobbyists.
This site is dedicated to HF short wave investigations & other signal identifications
Many of the radio reception recordings on this website pertain to unusual, uncommon, unknown, or mystery signals that might be found on radio, shortwave or VHF/UHF. Among the subjects covered are numbers stations, utility stations, military transmissions (both means in the clear and encrypted / encoded), aviation, maritime, ham radio, CB radio, radars, ionosodes, propagation beacons, ditters, dashers, whistlers, and just about anything else that might transmit, in any mode, USB, LSB, CW, Morse Code, FM, AM,FMCW, LFMCW, etc. etc. All the recordings are made by a team member. In other cases credits are mentioned, or © for copyright.
If you aren't a DXer or SWL or BCL or on the other hand: if you don't understand this words/shortcuts, then LEAVE THIS WEBSITE IMMEDIATELY ! You are not welcome ! No new visitors are exepected ! This Website is only and only for insiders of the shortwave hobby !
LEGAL ADVICE:
all recordings are completely legal. Within the EU, it is not forbidden to listen to and log analogue signals of any kind. This also applies to pirate stations. It's legal to listen to them!
Again: This Website is only and only for DX-Hobbyists.