@james1969 ,
You would need to establish a direct correlation between the subway train passing under your apartment building at the same times you are hearing the RFI noise through the speakers of your audio system. You need to start keeping a log.
I have been trying to research, over the net, noise in an audio system caused by cell towers.
From the Link toddverrone posted.
Keep phones away from audio gear Stages are carpeted in audio gear. The farther mobile phones are away from this equipment AND (very important) their cabling, the less likely they are to interfere. Most good engineers seem to impose an effective but draconian policy on talent: absolutely no cell phones anywhere on stage or off stage. All personal electronics are to be left in the green room, no exceptions, and all those in violation, famous or not, are chastised. Engineers everywhere would be wise to adopt similar policies.
@james1969 LOL, "Do you know where your cell phone is at this very moment?" For a test turn the thing off and get it as far from your audio system as possible.
What wall is your audio system set against? Out side wall? Directly facing cell tower?
Adjoining wall with neighbor?
When it comes to GSM buzz, not just any ferrite core will do. You must use one that has the correct number of turns and is made from material optimized for attenuating high frequency GSM signal, which can be anywhere from 800 MHz to 1800 MHz.
GMS buzz?
LTE?
TDMA ?
In layman terms please!
Re: On-site Cell Tower Interference
« Reply #2 on: October 03, 2012, 10:03:56 pm »
It’s highly unlikely the cell site will induce RFI problems with any properly designed audio equipment, or any other system inside the building.
First, cellular/PCS sector antennas are highly directional. Directly below the antenna is a major null with signal levels easily being 50-70dB below on axis carrier level (based on antenna type and design) before building attenuation is considered.
Second, you can request engineering data from the cellular/PCS service provider(s) and/or tower management firm which will tell you antenna make(s) and model(s), antenna array(s) design, location(s) and ERP of each TX antenna. An outside RF consultant can assist in determining RFI potential. Logged Henry Cohen
CP Communications www.cpcomms.com
Radio Active Designs www.radioactiverf.com Tom Young
http://forums.prosoundweb.com/index.php?topic=140277.0Send that guy an email, if possible.
@james1969 Can you see the antennas on the tower from your window? Higher? Lower?
https://www.google.com/search?source=hp&ei=mKoNWpfxCMrPmwGUyrK4Bw&q=picture+of+antennas+on+c... Here’s some EE talk.
https://electronics.stackexchange.com/questions/32830/why-does-gsm-cause-speakers-to-buzzJim
