Interfering Emissions

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Color Legend
Inactive
(No longer in use)
Active
(Currently in active use)
Status
Unknown or Intermittent
Signal Name Description Frequency Mode Modulation Bandwidth Location Sample Audio Waterfall image
Acer X222W monitor, sleep pulse Used for some PC monitors to keep the monitor's power on (or sleeping) across the spectra. Monitors may transmit whatever frequency peaks needed to keep it "on" or on sleep mode. 420 MHzMegaHertz (MHz) 10^6 Hz — 470 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation, AMAmplitude Modulation Pulse 300 kHzKiloHertz (kHz) 10^3 Hz Worldwide Acer monitor default sleep signal.PNG
DisplayPort Interference DisplayPort is a digital standard used to carry video and audio data to computer monitors. It emits RFRadio Frequency interference in the 300-400 MHzMegaHertz (MHz) 10^6 Hz range when in use. 159.558 MHzMegaHertz (MHz) 10^6 Hz — 381.5 MHzMegaHertz (MHz) 10^6 Hz RAW 250 kHzKiloHertz (kHz) 10^3 Hz Worldwide DP interference.png
HDMI RFI Clock HDMI is a popular media source for delivering video, audio, all in the same stream. Unfortunately, there is massive interference from it when a neighboring SDR is near it. It can disrupt receiving to a great degree. 742 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 445.5 MHzMegaHertz (MHz) 10^6 Hz RAW RAW Worldwide HDMI clock 4rd.png
HP Laptop RFRadio Frequency Interference Signals From HP Laptop 50.9 kHzKiloHertz (kHz) 10^3 Hz CWContinuous Wave USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)/LSBLower Side Band Modulation 1.5 kHzKiloHertz (kHz) 10^3 Hz WorldWide Annotation 2019-04-01 161921.png
High Speed USB Noise High Speed USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) 2.0 clock noise. Shows up at multiples of 480 MHzMegaHertz (MHz) 10^6 Hz. 480 MHzMegaHertz (MHz) 10^6 Hz — 960 MHzMegaHertz (MHz) 10^6 Hz RAW 200 kHzKiloHertz (kHz) 10^3 Hz Worldwide USB noise.png
Interferance signal from old computer screen A very crunchy signal coming from my Old hyundai computer screen, the sound changes depending on what is shown on the screen 639.006 MHzMegaHertz (MHz) 10^6 Hz AMAmplitude Modulation, DSBDual Side Band Modulation 23 kHzKiloHertz (kHz) 10^3 Hz WORLDWIDE Screenshot 2021-01-11 133411.png
Ionized Meteor Trails Meteors traversing the E region of the atmosphere approximately 60 - 90 miles up create ionizing trails which can reflect and refract radio waves from commercial FMFrequency Modulation radio stations that are hundreds and sometimes thousands of miles away from the receiver. 88.3 MHzMegaHertz (MHz) 10^6 Hz FMFrequency Modulation Worldwide Screen 1506684611.68 (3).jpg
Lightning Sferics VLFVery Low Frequency (3-30 kHz) RFRadio Frequency emissions from lightning in the atmosphere that can affect up to HFHigh Frequency (3-30 MHz) frequencies and beyond depending on strength. Has a popping crackle sound with both USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) and AMAmplitude Modulation modes of reception. HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). — 30 MHzMegaHertz (MHz) 10^6 Hz Worldwide Lightening Sfpherics.png
Smart TV Interference Interference from Smart TV units 528 MHzMegaHertz (MHz) 10^6 Hz USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) 84 kHzKiloHertz (kHz) 10^3 Hz Worldwide 528 11 August.png