It definitely sounds like cell phone interference to me as well. How it's getting into your system, though.. ?
high frequency intermittent noise
I have a noise issue that is intermittent. Here is what the noise sounds like:
https://clyp.it/4b233bmm
Here is what I know so far:
https://clyp.it/4b233bmm
Here is what I know so far:
- The sound affects all components and is compounded if all components are turned on. I have turned off my preamp, phono preamp, leaving just my mono blocks on, and the noise still appears.
- I have turned off everything and unplugged everything in the house including my dimmer switch, and the noise still appears.
- I have a pair of pro-audio monitors, self powered with class AB amps, and when I plug those into the same outlet, I hear the same noise coming through the pro-audio monitor. So this rules out my big system.
- The noise is primarily during the day and goes into the evenings, weekends too, early mornings it does not appear.
- I live in a pre-war mid-rise building. I have no ground, I'm using a Nordost QKore grounding system. This did reduce the noise floor quite a bit, but has no affect on this intermittent noise.
- I have a cell phone tower directly across the street from my building in Manhattan.
- Looking at a real time analyzer, I see peak at 2kHz when the noise appears.
Showing 7 responses by toddverrone
I found this: http://blog.rfvenue.com/2015/05/06/how-to-prevent-cell-phones-from-interfering-with-audio-equipment It talks about cell phone noise in a pro audio setting, and mostly with phones as the source of the noise, not a cell tower. But they do mention a way to get rid of the noise that hasn't been mentioned yet. It wouldn't be the best fix, but could at least let you see if it's coming through the RCA cables. Their fix: ferrite beads on the input cables, close to the end that plugs into the amp. The article recommends specific ferrite parameters to address cell phone noise.. If ferrites on your IC cables solve the problem, you could look at more heavily shielded ICs. If not, you're only out the cost of ferrites.. |
Sweet lord, you poor man. So.. Those copper mesh curtains.. You could lay one on the floor, stack your equipment on top, then wrap the curtain up and over, creating a true faraday cage, as long as you remember to ground it to a pipe or the ground in your outlet. Test to see if an actual faraday cage works.. If so, you could build a nicer looking one integrated into your rack. |