Contributor: Ken, VE3HLS
Noise Source: Computer speakers, made by Logitech
Where Found: 10051 kHz USB, and other locations in the HF band. The occurrances of noise are about 6 kHz wide.
Notes: The speakers were purchased about 5 years ago. They have a circuit in them that turns them off after several minutes of inactivity. They turn themselves on when they detect audio at the input. When off they emit the RF noise in the file, and go quiet when they are on.

Listen

Contributor: Henry Baum
Noise Source: Cable Internet Router
Where Found: 6m and 2m bands.
Notes: "This noise is heard on 6 meters and 2 meters only. I was so annoyed by the noise for about a year till I found out about the noise. This is the sound of my Cable internet router. The noise is only heard on a few frequncies on 6 meter SSB. The recording is of 6 meter SSB."

Listen

Contributor: Phil, VA3KDC
Noise Source: 5-Port Ethernet Switch
Where Found: Above 9 MHZ
Notes: "This recording is on a grundig FR-200 receiver The noise is from an SMC EZ 5 port ethernet switch. This noise is heard at intervals up and down HF, most noticible above 9 mHz. Recording was made in AM mode"

Listen

Contributor: Alex, KC5CMW
Noise Source: Toshiba Cable Modem
Where Found: 40m Band
Notes: "I have found that my computer cable modem emits a carrier with a data stream imbeded about every 30 kHz on the 40 meter band. I also notice it on the 10 MHz WWV freq. The modem is a Toshiba model pcx2600."

Listen

This sample was taken at 147.10 MHz FM.  The interference signal appeared every 240 kHz above and below 147.10 MHz and throughout the entire 2-meter band.

Listen