Home |
Search |
Today's Posts |
|
#1
|
|||
|
|||
Household Noise Sources ?
PC's
broadband cable modems small 120 to 12 V type of wal-warts Or,... ? All of the above. But some comments: Monitors can make a lot of harmonic hash throughout the HF spectrum. TV's don't seem quite so bad in general (3.58MHz and harmonics are of course a problem!) and I don't know much about HDTV's etc. Most wall-warts don't make a lot of noise, but small switching supplies are an exception. Fluorescent lamps and dimmers can make an awful racket. Electronic ballasts make a qualitatively different kind of hash than magnetic ballasts. Some low-voltage DC lighting and halogen lamps make incredible noise, I have no idea why (maybe a built-in dimmer?) Ethernet cabling running around the house can make some, especially concentrated at 10MHz and harmonics. Noise can be conducted over and radiated by power cables, ethernet cables, video cables, keyboard cables, etc. Motors can always be a source. Kitchen appliances are awful but not usually run for more than a few minutes at a time. Vacuum cleaners can be almost as bad. Furnace blowers, AC compressors, refrigerator compressors aren't as awful but in a modern house at least one of these is probably running somewhere. Sometimes I fantasize about moving out to the middle of nowhere, where there is no power grid! Tim. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
'Crackling' Noise on HF Band | Shortwave | |||
Icom 746pro Testimonial | Shortwave | |||
signal to noise ratio drops on connecting the antenna | Homebrew | |||
Automatic RF noise cancellation and audio noise measurement | Homebrew | |||
CCIR Coefficients METHOD 6 REC533 // AUCKLAND --> SEATTLE | Shortwave |