Posted: 9/30/2010 4:21:05 PM EDT
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Noticed a sweeping noise in the background. Takes a few seconds to get from low to high. Hit a few of the closest items, flourescent lights, etc, but it kept up.
Below is a screen shot from HRD. Any ideas? As you can tell, it looks like a sweeping, pattern. Kinda odd... haven't seen anything like that before. USB, 75M (turned 90 degrees CCW) 
USB 160M 
LSB 160M 
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Step 1, turn off main and all circuit breakers...
Step 2, turn back on main breaker... Step 3, turn on one circuit breaker and make note of noise... Step 4, determine if noise is local or neighbor related... Step 5, if neighbor related, cut neighbor feed lines... Step 6, repeat as necessary.... simple process... just have to have a "possitive mental attitude"... 
ETA: crap... "possitive mental attitude"... got that from "Avatar" great movie, btw... |
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Quoted:
Noticed a sweeping noise in the background. Takes a few seconds to get from low to high. The typical switching-type power supply has a relatively unstable operating frequency - Even after many hours of operation, it still drifts around some, causing harmonics of it to sweep across listening frequencies. The direction and speed of the sweep don't mean much, since they are random. One of the quickest ways of locating the offending interference source is to shut off HALF of the AC breakers. If the interference persists, shut off the remaining half - otherwise, start flipping breakers back on until the interference reappears. Note that some devices continue to produce interference even after AC power is removed. Laptop computers are notorious for this - The only way to rule them out as potential interference sources is to completely shut them down. |