[RFI] w8wwv- noise75.mp3, RFISERVICES

[dj2001 at mn.rr.com]

On the subject of devices putting out rfi, I have a recording of our 
Maytag washing machine signal on 75m.  I'd like to know what the heck 
in a washing machine that would put out a signal like that on 75 m. 
ham band.  If anyone is interested I can email the mp3 file.

Dale, K9VUJ






>I've listened to the noise75.mp3 file and my guess would be a computer
>is the cause. Possibly the power supply or video circuit. The reason for
>the occasional change in tone is the change in video (on screen) and
>this is causing the RFI to change its audio characteristic. This would
>also cause a change in the demand in the power supply which could also
>cause a change in the RFI sound.
>I would bet that the sound in the interference sometimes doesn't change
>for long periods of time and at other times changes rapidly. This is due
>to periods of heavy use and at other times sitting idle.
>This type of source will also cause TVI using over the signals. The TVI
>pattern would change with the change in audio.
>Within the next week my web site will have instructions on locating the
>home, town home... that contains such sources.
>Best wishes,
>Michael C Martin
>RFI Services
>6469 Old Solomons Island Rd
>Tracy's Landing MD 20779
>301-855-5961 Home/Office
>410-741-5153 Fax
>www.rfiservices.com
>mike at rfiservices.com
>
>
>
>
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