Chinese 'Foghorn' OTH radar

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Chinese 'Foghorn' OTH radar
Foghorn radar 67Hz 3.png
Frequencies 6 MHz,29 MHz
Frequency Range 6 MHz - 29 MHz
Mode USB
Modulation FMCW
ACF —
Emission Designator —
Bandwidth 10 kHz
Location China, Worldwide
Short Description A Chinese over the horizon radar, known as "foghorn" among amateur radio operators. Not much is known about it.
I/Q Raw Recording —
Audio Sample

Very little information about this over-the-horizon radar is available. The name "Foghorn" was apparently coined by amateur radio operators or shortwave listeners based on the sound that resembles a ship foghorn. [1][2]

Type 2319 has been mentioned in the UDXF community logs, but it has not been confirmed if this is the correct name for this radar.

The radar transmits FMCW signal with about 10 kHzKiloHertz (kHz) 10^3 Hz of bandwidth in bursts that typically last a few seconds, but may take longer as well. Sweep rates of 42, 48, 50, 67 and 83 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). have been observed. 67 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). is probably the most common, and 83 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). is rare. Unlike some other OTHOver The Horizon (very long range) radars, this radar does not seem to transmit an intro tone before the burst. Transmission often happens on multiple nearby frequencies in a sequential manner.

Some sources claim that this radar uses pulsed modulation. This seems to be a misunderstanding unless there is another radar that uses similar transmission parameters and transmits in pulses. (Fixme)


Samples[edit]

The following examples contain narrow USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) (5 kHzKiloHertz (kHz) 10^3 Hz), wide USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) (10 kHzKiloHertz (kHz) 10^3 Hz) and FMFrequency Modulation samples. The showcase sample is 67 sweeps/sec, narrow USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables).


67 sweeps/sec 50 sweeps/sec 48 sweeps/sec 42 sweeps/sec
Narrow USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables):

Wide USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables):

FMFrequency Modulation:
Foghorn radar 67Hz 2.png
 Narrow USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables):

Wide USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables):

FMFrequency Modulation:
Foghorn radar 50Hz 2.png
 Narrow USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables):

Wide USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables):

FMFrequency Modulation:
Foghorn radar 48Hz 1.png
 Narrow USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables):

Wide USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables):

FMFrequency Modulation:
Foghorn radar 42Hz 1.png

Frequencies[edit]

Frequency range of this radar is not well known. It can change its frequency according to propagation conditions. Ranges from 6 MHzMegaHertz (MHz) 10^6 Hz to 29 MHzMegaHertz (MHz) 10^6 Hz and 7 MHzMegaHertz (MHz) 10^6 Hz to 25 MHzMegaHertz (MHz) 10^6 Hz have been reported. Later in the local afternoon high frequencies start to move lower. Up to 35 frequencies may be active at a time.


  • 6.515 MHzMegaHertz (MHz) 10^6 Hz
  • 6.522 MHzMegaHertz (MHz) 10^6 Hz
  • 6.799 MHzMegaHertz (MHz) 10^6 Hz
  • 6.823 MHzMegaHertz (MHz) 10^6 Hz
  • 6.841 MHzMegaHertz (MHz) 10^6 Hz
  • 7.120 MHzMegaHertz (MHz) 10^6 Hz
  • 7.500 MHzMegaHertz (MHz) 10^6 Hz
  • 7.675 MHzMegaHertz (MHz) 10^6 Hz
  • 7.722 MHzMegaHertz (MHz) 10^6 Hz
  • 7.735 MHzMegaHertz (MHz) 10^6 Hz
  • 7.825 MHzMegaHertz (MHz) 10^6 Hz
  • 7.944 MHzMegaHertz (MHz) 10^6 Hz
  • 7.969 MHzMegaHertz (MHz) 10^6 Hz
  • 8.165 MHzMegaHertz (MHz) 10^6 Hz
  • 8.225 MHzMegaHertz (MHz) 10^6 Hz
  • 8.285 MHzMegaHertz (MHz) 10^6 Hz
  • 8.367 MHzMegaHertz (MHz) 10^6 Hz
  • 8.374 MHzMegaHertz (MHz) 10^6 Hz
  • 8.727 MHzMegaHertz (MHz) 10^6 Hz
  • 8.737 MHzMegaHertz (MHz) 10^6 Hz
  • 9.102 MHzMegaHertz (MHz) 10^6 Hz
  • 9.187 MHzMegaHertz (MHz) 10^6 Hz
  • 9.203 MHzMegaHertz (MHz) 10^6 Hz
  • 9.237 MHzMegaHertz (MHz) 10^6 Hz
  • 9.305 MHzMegaHertz (MHz) 10^6 Hz
  • 9.545 MHzMegaHertz (MHz) 10^6 Hz
  • 10.150 MHzMegaHertz (MHz) 10^6 Hz
  • 10.420 MHzMegaHertz (MHz) 10^6 Hz
  • 10.435 MHzMegaHertz (MHz) 10^6 Hz
  • 10.623 MHzMegaHertz (MHz) 10^6 Hz
  • 10.630 MHzMegaHertz (MHz) 10^6 Hz
  • 10.712 MHzMegaHertz (MHz) 10^6 Hz
  • 10.760 MHzMegaHertz (MHz) 10^6 Hz
  • 10.786 MHzMegaHertz (MHz) 10^6 Hz
  • 11.116 MHzMegaHertz (MHz) 10^6 Hz
  • 11.590 MHzMegaHertz (MHz) 10^6 Hz
  • 11.838 MHzMegaHertz (MHz) 10^6 Hz
  • 12.123 MHzMegaHertz (MHz) 10^6 Hz
  • 12.680 MHzMegaHertz (MHz) 10^6 Hz
  • 13.666 MHzMegaHertz (MHz) 10^6 Hz
  • 13.975 MHzMegaHertz (MHz) 10^6 Hz
  • 14.190 MHzMegaHertz (MHz) 10^6 Hz
  • 14.299 MHzMegaHertz (MHz) 10^6 Hz
  • 14.529 MHzMegaHertz (MHz) 10^6 Hz
  • 14.822 MHzMegaHertz (MHz) 10^6 Hz
  • 15.224 MHzMegaHertz (MHz) 10^6 Hz
  • 15.251 MHzMegaHertz (MHz) 10^6 Hz
  • 15.566 MHzMegaHertz (MHz) 10^6 Hz
  • 15.675 MHzMegaHertz (MHz) 10^6 Hz
  • 15.702 MHzMegaHertz (MHz) 10^6 Hz
  • 16.055 MHzMegaHertz (MHz) 10^6 Hz
  • 16.660 MHzMegaHertz (MHz) 10^6 Hz
  • 17.577 MHzMegaHertz (MHz) 10^6 Hz
  • 17.713 MHzMegaHertz (MHz) 10^6 Hz
  • 17.765 MHzMegaHertz (MHz) 10^6 Hz
  • 17.846 MHzMegaHertz (MHz) 10^6 Hz
  • 18.672 MHzMegaHertz (MHz) 10^6 Hz
  • 18.730 MHzMegaHertz (MHz) 10^6 Hz
  • 18.758 MHzMegaHertz (MHz) 10^6 Hz
  • 18.908 MHzMegaHertz (MHz) 10^6 Hz
  • 19.046 MHzMegaHertz (MHz) 10^6 Hz
  • 19.265 MHzMegaHertz (MHz) 10^6 Hz
  • 19.301 MHzMegaHertz (MHz) 10^6 Hz
  • 19.415 MHzMegaHertz (MHz) 10^6 Hz
  • 19.708 MHzMegaHertz (MHz) 10^6 Hz
  • 20.271 MHzMegaHertz (MHz) 10^6 Hz
  • 20.295 MHzMegaHertz (MHz) 10^6 Hz
  • 20.611 MHzMegaHertz (MHz) 10^6 Hz
  • 20.735 MHzMegaHertz (MHz) 10^6 Hz
  • 20.906 MHzMegaHertz (MHz) 10^6 Hz
  • 20.945 MHzMegaHertz (MHz) 10^6 Hz
  • 21.225 MHzMegaHertz (MHz) 10^6 Hz
  • 21.256 MHzMegaHertz (MHz) 10^6 Hz
  • 21.345 MHzMegaHertz (MHz) 10^6 Hz
  • 21.592 MHzMegaHertz (MHz) 10^6 Hz
  • 21.786 MHzMegaHertz (MHz) 10^6 Hz
  • 21.900 MHzMegaHertz (MHz) 10^6 Hz
  • 22.197 MHzMegaHertz (MHz) 10^6 Hz
  • 22.227 MHzMegaHertz (MHz) 10^6 Hz
  • 22.279 MHzMegaHertz (MHz) 10^6 Hz
  • 22.590 MHzMegaHertz (MHz) 10^6 Hz
  • 22.971 MHzMegaHertz (MHz) 10^6 Hz
  • 23.038 MHzMegaHertz (MHz) 10^6 Hz
  • 23.178 MHzMegaHertz (MHz) 10^6 Hz
  • 23.798 MHzMegaHertz (MHz) 10^6 Hz
  • 24.425 MHzMegaHertz (MHz) 10^6 Hz
  • 24.728 MHzMegaHertz (MHz) 10^6 Hz
  • 24.770 MHzMegaHertz (MHz) 10^6 Hz
  • 24.788 MHzMegaHertz (MHz) 10^6 Hz
  • 24.846 MHzMegaHertz (MHz) 10^6 Hz
  • 25.117 MHzMegaHertz (MHz) 10^6 Hz
  • 26.234 MHzMegaHertz (MHz) 10^6 Hz
  • 26.678 MHzMegaHertz (MHz) 10^6 Hz
  • 26.819 MHzMegaHertz (MHz) 10^6 Hz
  • 26.845 MHzMegaHertz (MHz) 10^6 Hz
  • 26.900 MHzMegaHertz (MHz) 10^6 Hz
  • 27.104 MHzMegaHertz (MHz) 10^6 Hz
  • 27.204 MHzMegaHertz (MHz) 10^6 Hz
  • 27.230 MHzMegaHertz (MHz) 10^6 Hz
  • 27.238 MHzMegaHertz (MHz) 10^6 Hz
  • 27.266 MHzMegaHertz (MHz) 10^6 Hz
  • 27.310 MHzMegaHertz (MHz) 10^6 Hz

Video Examples[edit]

Additional Images[edit]

  • Multiple "Foghorn" radar bursts around 16.7 MHzMegaHertz (MHz) 10^6 Hz

  • Typical "Foghorn radar transmissions on nearby frequencies

  • "Foghorn" radar bursts, including a longer one, among other signals

  • Suspected continuous transmission, 67 sweeps/sec, overlapping with a stronger data signal

References[edit]

  1. ↑ http://www.arrl.org/news/mysterious-foghorn-is-chinese-over-the-horizon-burst-radar
  2. ↑ http://www.arrl.org/news/over-the-horizon-radars-continue-to-plague-amateur-bands
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