Unknown 13p57 robot-like beeping signal
 | |
|---|---|
| Frequencies | 11.57 MHz,21.695 MHz |
| Frequency Range | 11.57 MHz - 21.695 MHz |
| Mode | AM |
| Modulation | Unknown |
| ACF | — |
| Bandwidth | 6.7 kHz |
| Location | Worldwide |
| Short Description | Unknown beeping signal that has appeared on several broadcast frequencies. Possibly a jammer, but may also be a test transmission or data. |
| I/Q Raw Recording | Download file |
| Audio Sample | |
This signal has been observed in summer 2024. It makes odd beeps and occasional frequency sweeps or chirps.
Purpose of this signal is unknown. Since it has been spotted on broadcast frequencies, it may be a broadcast station transmitting a test signal, or a jammer targeting broadcast stations. It may also be data, and the beeps may contain a CWContinuous Wave message but this has not been confirmed.
Samples[edit]
Showcase sample is AMAmplitude Modulation.USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) sample, tuned to the center of the signal (lower half ignored):
USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) sample, tuned about 250 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). below the lower edge of the signal:
DSBDual Side Band Modulation sample:
NFMNarrowband Frequency Modulation sample:
Frequencies[edit]
So far this signal has been observed on the following frequencies.
7466 kHzKiloHertz (kHz) 10^3 Hz
11570 kHzKiloHertz (kHz) 10^3 Hz
11815 kHzKiloHertz (kHz) 10^3 Hz
13570 kHzKiloHertz (kHz) 10^3 Hz
13790 kHzKiloHertz (kHz) 10^3 Hz
13810 kHzKiloHertz (kHz) 10^3 Hz
15265 kHzKiloHertz (kHz) 10^3 Hz
15280 kHzKiloHertz (kHz) 10^3 Hz
15295 kHzKiloHertz (kHz) 10^3 Hz
15310 kHzKiloHertz (kHz) 10^3 Hz
15400 kHzKiloHertz (kHz) 10^3 Hz
15490 kHzKiloHertz (kHz) 10^3 Hz
17670 kHzKiloHertz (kHz) 10^3 Hz
21695 kHzKiloHertz (kHz) 10^3 Hz
All of these frequencies are used for broadcasting. Most of these are used by Radio Free Asia which suggests that this may be a jammer.
Video Examples[edit]
- Shortwave oddity on 15400kHz. 29 Jun 2024, 2354Z
- 【业余无线电】13米短波上的怪异电台！
- Mysterious data transmission on 15295 kHz. Received in southeast Uruguay at 2013 UTC.
- Link 22 Data Mode? 08/06/2024 2030 UTC 13570kHz
