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Cellular Phone Forum / Providers / Cingular / July 2005GSM interfering with powered stereo speakers
For the past month or so, I've been getting odd noise effects from my speakers: Car, home stereo and computer. I was finally able to pin the pattern down. It started happening when I first got a Cingular GSM phone, and it only happens when the phone is on. It happens when the phone is turning on, turning off, or connecting for making or receiving a call, and semi-random times while the phone is on. It only happens when the speakers are on, and the volume/mute controls on the effected tuner/amp effect the volume of the induced noise. Does anyone know why this happens, and if there is any solution short of replacing everything?  SignatureJeffrey Kaplan www.gordol.org The from userid is killfiled Send personal mail to gordol "This is a possible future Commander, and it is my hope that you may yet avoid it." (Lady Ladira, B5 "Signs and Portents") >For the past month or so, I've been getting odd noise effects from my >speakers: Car, home stereo and computer. I was finally able to pin [quoted text clipped - 9 lines] >Does anyone know why this happens, and if there is any solution short >of replacing everything? There's really nothing you can do since the tinga-tinga-buzz-buzz-buzz is what you get when a GSM handset gets near any unshielded device such as a speaker or even near regular telephones with electret type microphones. You won't get that with carbon granule transmitter phones. With TDMA near speakers instead of getting the tinga-tina-buzz-buzz-buzz you get a low toned buzz. To my knowlege you don't get this with CDMA, but you do with GSM and "TDMA" aka IS-136. You'll only get the buzzing as you said when the phone is turned on, initiating a call or about to ring. You might get the occasional burst of noise if for some reason the phone has to check with the network. Bottom line is if you stay with GSM or TDMA you're going to have noise on your speakers and other unshielded audio devices. And the only thing you could really replace is your phone service with cingular and go with a CDMA carrier. All GSM/TDMA providers have this trait. - - >>For the past month or so, I've been getting odd noise effects from my >>speakers: Car, home stereo and computer. I was finally able to pin [quoted text clipped - 28 lines] > - - > ...or replace any speaker wires with shielded cables. Signaturejer email reply - I am not a 'ten' It is alleged that Jer claimed: ; ...or replace any speaker wires with shielded cables. Actually, iirc, the speakers in my living room are fed by shielded cables. I'd have to double-check. But that doesn't help me wrt my computer or car. Guess I'll just live with it. SignatureJeffrey Kaplan www.gordol.org The from userid is killfiled Send personal mail to gordol "I won't bite, Vir." "With all due respect, madam. That's not what I've heard." "all right, that +one+ time." "It was twice." (Timov and Vir Coto, B5 "Soul Mates") > It is alleged that Jer claimed: > [quoted text clipped - 5 lines] > > Guess I'll just live with it. Most home theater and PC speakers are already shielded in this manner to protect CRT systems from a speaker's magnetic field. If a speaker enclosure isn't shielded, one can remedy that by lining the interior cabinet surface with aluminum foil, and connecting that to the coaxial shield. Here, all the speakers are connected via shielded cables - on the theater equipment in the rec room and the PC here in the office - due to the hi-powered CB radios so prevalent around here. Mind you, not all speaker enclosures are shielded, so there's still a minor risk there (see above), but the majority of the problem is with the wiring in walls and under carpet. The cabling for each speaker has the + and - wires enclosed within a coaxial shield, with the shield on the supply end connected to earth bond. Yes, I still hear it in the car, but trying to create a hi-end sound system there is expensive with dubious value, so I've let that go. Signaturejer email reply - I am not a 'ten' Foil won't do anything, except maybe for those MLB spy satellites (do you line your headgear, just in case?). Don't believe me? Put a magnet on one side of your foil and your TV screen on the other. Sure, go ahead and solder in your "coax". As anyone who knows how to spell experiment knows, you've failed. Back to the drawing board. Look up mu-metal. And for goodness sakes, wear goggles! Or just turn off your phone, which has nothing to do with the "shielding" of shielded loudspeakers. J- [Sun, 03 Jul 2005 07:52:40 -0500]: >protect CRT systems from a speaker's magnetic field. If a speaker >enclosure isn't shielded, one can remedy that by lining the interior >cabinet surface with aluminum foil, and connecting that to the coaxial >shield. Signature40th Floor - Software @ http://40th.com/ iPlay : the ultimate audio player for mobiles mp3,mp4,m4a,aac,ogg,flac,wav,play & record parametric eq, xfeed, reverb; all on a mobile > Foil won't do anything, except maybe for those MLB spy > satellites (do you line your headgear, just in case?). [quoted text clipped - 11 lines] > >cabinet surface with aluminum foil, and connecting that to the coaxial > >shield. Interesting... then the foil I added to the inside of my center channel speaker cabinet (which sits directly on top of the display), which screwed up the display image beforehand, and not afterward, is a failure? Interesting hypothesis. Signaturejer email reply - I am not a 'ten' "Center channel" loudspeakers are made to be put on a TV. You may as well claim you don't receive any MLB spy satellite transmissions when you wear your tinfoil cap. That may be true; I wouldn't know. As for the foil acting as a barrier to any kind of magnet, that is not true. J- [Sun, 03 Jul 2005 14:40:05 -0500]: >then the foil I added to the inside of my center channel >speaker cabinet..., is a >failure? Interesting hypothesis. But not a terribly interesting story anyway. It has nothing to do with the thread topic, either. Signature40th Floor - Software @ http://40th.com/ iPlay : the ultimate audio player for mobiles mp3,mp4,m4a,aac,ogg,flac,wav,play & record parametric eq, xfeed, reverb; all on a mobile > "Center channel" loudspeakers are made to be put on a TV. > You may as well claim you don't receive any MLB spy [quoted text clipped - 8 lines] > But not a terribly interesting story anyway. It has > nothing to do with the thread topic, either. This particular speaker assembly was never intended to be used in this manner. The housing simply works for it's new application, as the original speakers were replaced with heavier drivers more appropriate to providing a balanced front sound stage for 200 watt channel given the timber of the other two front mains. The shield material was obtained from a sound engineer whom I've known for over thirty years - it's what he uses - and bonding it to the coaxial cable shield gives an acceptable performance. Your assertion that center channel speakers are designed to be used this way is certainly spot on - this design with the added shielding works for it's intended application, both physically and acoustically. Since the front grill is customized the same as the others, the aesthetic value of the entire system is preserved as well. Your assertion that it's not a very interesting story, despite my tinfoil wardrobe, is also spot on - however, I well and truly don't give a sh.t. You, sir, are welcome to sit there believing whatever you prefer - I will sit here and enjoy my own creation sans interference from CB radios, cell phones, and assorted idiots. The whole point of my post was to offer an alternative to complaining about an issue where none of us are without remedy. I beleive it to be relevant, apparently you disagree. Had you been the original poster, I may have given a sh.t about that, but you weren't and I don't. HANDA Signaturejer email reply - I am not a 'ten' >> "Center channel" loudspeakers are made to be put on a TV. >> You may as well claim you don't receive any MLB spy [quoted text clipped - 35 lines] > > HANDA I work as an Avionics Tech and the newer aircraft use proximity sensors and ferrous targets for such things as gear down, weight on wheels, doors being open and so forth. We use pieces of aluminum to break the electromagnetic lines of flux such as when we want to fool the aircraft into thinking it is not on the ground, and if we want to test the sensors when the aircraft configuration has the ferrous targets in a far condition, we tape something ferrous to the sensor such as a piece of hacksaw blade or anything like that. You are correct that aluminum will shield magnetic lines of flux. Aluminum is often used to shield speakers built to be near any type of crt. SignatureDave > Here, all the speakers are connected via shielded cables - on the > theater equipment in the rec room and the PC here in the office - due to [quoted text clipped - 6 lines] > create a hi-end sound system there is expensive with dubious value, so > I've let that go. I just realized that I don't get that interference in my car. It's become such a part of life that it's an extension of the phone's ringer to me, that I can follow the status of the phone based on the sounds. I have a Toyota. TH >> It is alleged that Jer claimed: >> [quoted text clipped - 22 lines] > hi-end sound system there is expensive with dubious value, so I've let > that go. Who would buy cheap, unshielded speakers for a sound system? It is alleged that Joseph claimed: ; >Does anyone know why this happens, and if there is any solution short ; >of replacing everything? ; ; There's really nothing you can do since the tinga-tinga-buzz-buzz-buzz ; is what you get when a GSM handset gets near any unshielded device ; such as a speaker or even near regular telephones with electret type ; microphones. You won't get that with carbon granule transmitter ; phones. With TDMA near speakers instead of getting the ; tinga-tina-buzz-buzz-buzz you get a low toned buzz. To my knowlege ; you don't get this with CDMA, but you do with GSM and "TDMA" aka ; IS-136. You'll only get the buzzing as you said when the phone is ; turned on, initiating a call or about to ring. You might get the ; occasional burst of noise if for some reason the phone has to check ; with the network. Bottom line is if you stay with GSM or TDMA you're ; going to have noise on your speakers and other unshielded audio ; devices. And the only thing you could really replace is your phone ; service with cingular and go with a CDMA carrier. All GSM/TDMA ; providers have this trait. Basically what I figured, but with tech details. :) FWIW, I switched +to+ Cingular/GSM because there is zero CDMA coverage where I now live. I'm in signal shadow to/from all of the local CDMA towers. I've been here a year, and VZW, my previous provider, has no plans on doing anything about it. SignatureJeffrey Kaplan www.gordol.org The from userid is killfiled Send personal mail to gordol "Look, I don't mind if you bend the rules a little, Doctor. I mean I bend a few myself. But I do like to be informed. If I'm going to share in the blame, I'd at least like to share in some of the fun." (Lt. Cmdr. Ivanova, B5 "The Quality of Mercy") Dude, the frequency at which gsm phones operate (850-1900 mhz) resonates at an approx. dimention of modt wires. just move your phone away from the music box. It is alleged that Morgan Goose claimed: ; the frequency at which gsm phones operate (850-1900 mhz) resonates at an ; approx. dimention of modt wires. just move your phone away from the music ; box. Not possible. Each area where this happens places me no more than 8 feet away from a speaker, and I'm already as far from them as the space or circumstance allows. My only real options are shielding or live with it. SignatureJeffrey Kaplan www.gordol.org The from userid is killfiled Send personal mail to gordol "And after spending a day dealing with Amb. G'Kar, I long to sink my teeth into something..." (Amb. Londo, B5 "Born to the Purple") |
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