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Nextel phone making speakers click

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Name: yiphic
Date: March 9, 2006 at 08:22:08 Pacific
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Comment:

I'm the resident IT guy as my place of business and one of the employees here has a Sprint/Nexttel phone. Whenever it's making incoming or outgoing calls, her PC's speakers make a horrid and constant staticy click. We've tried several different speakers with no change. And she says it happens to her speakers at home also.

It happens whether she uses the phone in 2-way mode or cellular mode. But no one else's cell phone creates the same effect.

I can't imagine she's the first person to ever run into this problem. Is there some brand of speakers that might resist this, or some other kind of sheilding solution that anyone might know of? Thank's so much in advance!



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Response Number 1
Name: Kurt S
Date: March 9, 2006 at 08:28:28 Pacific
Reply:

No your not the first person to run into this. We have it happen all over our building as well. I'll be interested to see if anyone has a solution other then doing some major shielding which simply isn't an option.


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Response Number 2
Name: name
Date: March 9, 2006 at 08:53:15 Pacific
Reply:

Welcome to the world of politically modified "good engineering practice"

As an amateur radio operator, shortwave listener, formerly envolved directly in two way and telco installation and maintenance, I can tell you that I've fought this kind of stuff all my active life.

Now that the FCC (in the US) is being run by politicized appointees (lawyers and buddies) instead of engineers, the what was darn poor and darn poorly enforced regulations is now a joke. It would be, if it was actually funny.

One thing the FCC has done is to raise the "acceptable" levels of RF envolved with RF interferance, to make the beloved BPL (Broadband over Power Lines) "fit the rules.


What this means simply, is that an RF interferance source can now be legally "more powerful" than it used to be.

Every day, I fight interferance from everything from switching power supplies--used in laptops, cell chargers, printer power supplies, as well as almost every other solid state switched household and commercial device. This includes but is not limited to almost any household "charger" device, lamp dimmers, various computers and accessories, including cable/DSL modems, routers, and leaky LAN cableing. On and on we go.

Here you are, now, with one of the most cheaply engineered consumer goods on earth--the computer speaker, uh, "system." If you ever pop one open, you'll find there is NO shielding of any kind, and certainly nothing to help contain the fields from the speaker magnets which can damage floppies or other magnetic media, and affect CRT displays. (I left them out---CRT displays are another source, and receptor--of various magnetic, electrical, and RF interferance. Did I mention UPS's?


The cure? Might not be an easy one, because the RF wavelength of any cellular/wireless device is so short, that common low/high frequency methods, such as toroid cores on the cables, is ineffective.

Better shielding of the audio input to the system might help, as would shorter cables.

Another thing which may help, is IF you have a system with built in volume controls,--would be to turn the software controls up relatively HIGH, and then run the speaker controls (hardware) as low as possible.

This will decrease the gain of the speaker amplifier, and therefore the cable from the computer to the speaker will pick up somewhat less.


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