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- 05-02-2007, 03:58 PM #1SMSGuest
See "http://www.youtube.com/watch?v=pRG1iB8NF14"
Well technically it's not a Cingular issue per se, it's a GSM issue.
"http://blogs.chron.com/techblog/archives/2005/08/whats_the_buzz.html"
› See More: You Tube Video on Cingular/AT&T Speaker Destruction Issue
- 05-03-2007, 06:43 AM #2Guest
Re: You Tube Video on Cingular/AT&T Speaker Destruction Issue
On Wed, 02 May 2007 20:28:06 -0400, "Elmo P. Shagnasty"
<[email protected]> wrote:
>In article <[email protected]>,
> SMS <[email protected]> wrote:
>
>> See "http://www.youtube.com/watch?v=pRG1iB8NF14"
>>
>> Well technically it's not a Cingular issue per se, it's a GSM issue.
>>
>> "http://blogs.chron.com/techblog/archives/2005/08/whats_the_buzz.html"
>
>The exact same thing happens with my Nextel, too.
Just means your radio or PC speakers are likely junk from China
and not adequately shielded. Not Cingular's fault at all.
- 05-03-2007, 07:59 AM #3JeffGuest
Re: You Tube Video on Cingular/AT&T Speaker Destruction Issue
<[email protected]> wrote in message
news:[email protected]...
> On Wed, 02 May 2007 20:28:06 -0400, "Elmo P. Shagnasty"
> <[email protected]> wrote:
>
>>In article <[email protected]>,
>> SMS <[email protected]> wrote:
>>
>>> See "http://www.youtube.com/watch?v=pRG1iB8NF14"
>>>
>>> Well technically it's not a Cingular issue per se, it's a GSM issue.
>>>
>>> "http://blogs.chron.com/techblog/archives/2005/08/whats_the_buzz.html"
>>
>>The exact same thing happens with my Nextel, too.
>
>
> Just means your radio or PC speakers are likely junk from China
> and not adequately shielded. Not Cingular's fault at all.
Wrong.
What a minute ...
Is this Navas using a different name?
- 05-03-2007, 09:16 AM #4Klay AndersonGuest
Re: You Tube Video on Cingular/AT&T Speaker Destruction Issue
In article <[email protected]>,
[email protected] wrote:
> Just means your radio or PC speakers are likely junk from China
> and not adequately shielded. Not Cingular's fault at all.
No no no. Look, a cell phone is a two-way radio running somewhere in
the 800-1900 mHz band. This means it transmits and receives. The radio
waves emitted by a GSM handset can have a peak power of 2 watts, and a
US analog phone had a maximum transmit power of 3.6 watts. Other digital
mobile technologies, such as CDMA and TDMA, use lower output power,
typically below 1 watt.
Now, as the phone idles, the local cell tower needs to know what phones
it has in its coverage area for routing so it "polls" and the phones in
its area respond. This is the noise you "hear".
OK. Now let's look at audio. For this discussion, we'll say that "oh
my heck" you just put your phone next to an audio circuit. This circuit
could be a sound card, or a hi-fi receiver or simply the pre-amp/amp
inside powered speakers or even a radio or car stereo or iPod. Remember
that a wire is an antenna!
With just one watt of radiated RF power next to a typical stereo
receiver or its cabling (speaker cables, too!), that emitted RF will be
induced into the audio section, demodulated and amplified *a lot* to
become a very loud and possibly damaging square wave that tweeters
especially hate.
Move your cell phone away from that stuff and the problem goes away as
well.
--
Thanks!
--
Regards,
Mr. Klay Anderson, D.A.,Q.B.E.
Klay Anderson Audio, Inc.
http://www.klay.com
- 05-03-2007, 12:38 PM #5Dennis FergusonGuest
Re: You Tube Video on Cingular/AT&T Speaker Destruction Issue
On 2007-05-03, Klay Anderson <[email protected]> wrote:
> In article <[email protected]>,
> [email protected] wrote:
>
>> Just means your radio or PC speakers are likely junk from China
>> and not adequately shielded. Not Cingular's fault at all.
>
> No no no. Look, a cell phone is a two-way radio running somewhere in
> the 800-1900 mHz band. This means it transmits and receives. The radio
> waves emitted by a GSM handset can have a peak power of 2 watts, and a
> US analog phone had a maximum transmit power of 3.6 watts. Other digital
> mobile technologies, such as CDMA and TDMA, use lower output power,
> typically below 1 watt.
That's not quite right. All digital phones seem to run about the
same average output power these days, about 0.2-0.3 Watts. GSM
phones may actually be on the lower end of this judging by how
long a charge in their teeny tiny batteries tends to last. The
thing about TDMA phones (i.e. TDMA, GSM and Nextel) is that they
transmit in short bursts, being quiet most of the time and then spitting
out a narrow-band signal over a short period. To have an average power
of, say, 0.25W, when you are only transmitting 1/8th of the time
the peak power needs to be a lot higher, but the average is still
the same as, say, a CDMA phone which transmits continuously when
connected.
The problem with all these TDMA phones is that the bursts themselves
tend to be transmitted at audio frequencies, i.e. a burst every
few milliseconds. It doesn't take much to demodulate this into
something you can hear, and while the remaining audio frequency
power is tiny if it gets into the front of an amplifier section
it can, as you say, be amplified a lot. It is still a fault of
the electronics that it is receiving this stuff (it is obviously
possible to design circuits resistant to this; the phones themselves
don't usually interfere with their own audio) but the nature of the
signal makes this more difficult.
The thing I wanted to point out, however, is that this isn't
limited to GSM phones. I've heard Nextel phones doing it too, and
I suspect TDMA phones probably did it as well. I think it is
inherent to the technology.
Dennis Ferguson
- 05-03-2007, 01:46 PM #6Todd H.Guest
Re: You Tube Video on Cingular/AT&T Speaker Destruction Issue
Dennis Ferguson <[email protected]> writes:
> The thing I wanted to point out, however, is that this isn't
> limited to GSM phones. I've heard Nextel phones doing it too, and
> I suspect TDMA phones probably did it as well. I think it is
> inherent to the technology.
FWIW, none of my Cingular TDMA phones did the gallopy thing.
Well, except for the GAIT phone I had, which was TMDA, GSM, and AMPS,
with which came a change to the GSM based network as primary.
--
Todd H.
http://toddh.net/
- 05-03-2007, 06:00 PM #7John NavasGuest
Re: You Tube Video on Cingular/AT&T Speaker Destruction Issue
On Thu, 03 May 2007 14:54:56 -0700, SMS <[email protected]>
wrote in <[email protected]>:
>Jeff wrote:
>> <[email protected]> wrote in message
>> news:[email protected]...
>>> On Wed, 02 May 2007 20:28:06 -0400, "Elmo P. Shagnasty"
>>> <[email protected]> wrote:
>>>
>>>> In article <[email protected]>,
>>>> SMS <[email protected]> wrote:
>>>>
>>>>> See "http://www.youtube.com/watch?v=pRG1iB8NF14"
>>>>>
>>>>> Well technically it's not a Cingular issue per se, it's a GSM issue.
>>>>>
>>>>> "http://blogs.chron.com/techblog/archives/2005/08/whats_the_buzz.html"
>>>> The exact same thing happens with my Nextel, too.
>>>
>>> Just means your radio or PC speakers are likely junk from China
>>> and not adequately shielded. Not Cingular's fault at all.
>>
>> Wrong.
>I don't think so. You're correct, it isn't an issue with the speakers,
In fact it is an issue with speakers, which aren't sufficiently
shielded. These handsets meet FCC requirements.
>but I think that a lot of people are quick to blame China for any
>problem with any product!
Totally irrelevant.
--
Best regards, FAQ FOR CINGULAR WIRELESS:
John Navas <http://en.wikibooks.org/wiki/Cingular_Wireless_FAQ>
- 05-03-2007, 06:00 PM #8ScottGuest
Re: You Tube Video on Cingular/AT&T Speaker Destruction Issue
[email protected] wrote in news:16mj33hsi82mlmnac0q90rju1q1l76rn08
@4ax.com:
> On Wed, 02 May 2007 20:28:06 -0400, "Elmo P. Shagnasty"
> <[email protected]> wrote:
>
>>In article <[email protected]>,
>> SMS <[email protected]> wrote:
>>
>>> See "http://www.youtube.com/watch?v=pRG1iB8NF14"
>>>
>>> Well technically it's not a Cingular issue per se, it's a GSM issue.
>>>
>>> "http://blogs.chron.com/techblog/archives/2005/08/whats_the_buzz.html"
>>
>>The exact same thing happens with my Nextel, too.
>
>
> Just means your radio or PC speakers are likely junk from China
> and not adequately shielded. Not Cingular's fault at all.
Gee, Phil- more prejudicial racial profiling from you? You're an even
bigger bigot than I could have ever imagined.
- 05-03-2007, 06:17 PM #9Todd AllcockGuest
Re: You Tube Video on Cingular/AT&T Speaker Destruction Issue
At 03 May 2007 14:46:22 -0500 Todd H. wrote:
> FWIW, none of my Cingular TDMA phones did the gallopy thing.
>
> Well, except for the GAIT phone I had, which was TMDA, GSM, and AMPS,
> with which came a change to the GSM based network as primary.
IIRC, however, my TDMA phones made a different noise through my PC
speakers (but far less often- I wonder if the TDMA system was less
"concerned" with keeping up with who was camping on the network than GSM
is. In fact, now that I think of it, my TDMA phones didn't "chatter"
over the speakers until they received a call (ironically, therefore, my
PC would "ring" before the phone did!)
--
Posted via a free Usenet account from http://www.teranews.com
- 05-04-2007, 11:37 AM #10John NavasGuest
Re: You Tube Video on Cingular/AT&T Speaker Destruction Issue
On Fri, 4 May 2007 17:26:35 +0000 (UTC), [email protected] (Mike S.)
wrote in <[email protected]>:
>In article <[email protected]>,
>Todd Allcock <[email protected]> wrote:
>>IIRC, however, my TDMA phones made a different noise through my PC
>>speakers (but far less often- I wonder if the TDMA system was less
>>"concerned" with keeping up with who was camping on the network than GSM
>>is. In fact, now that I think of it, my TDMA phones didn't "chatter"
>>over the speakers until they received a call (ironically, therefore, my
>>PC would "ring" before the phone did!)
> Date: 11 Mar 94 21:34:21 EST
> From: Stewart Fist <[email protected]>
> Subject: GSM and TDMA Problems
>
> John Sims <[email protected]> asks about the problems with GSM.
>
> [SNIP]
Those negative comments are wildly exaggerated.
--
Best regards, FAQ FOR CINGULAR WIRELESS:
John Navas <http://en.wikibooks.org/wiki/Cingular_Wireless_FAQ>
- 05-07-2007, 05:41 AM #11xPosTechGuest
Re: You Tube Video on Cingular/AT&T Speaker Destruction Issue
On 5/4/2007 12:26 PM, Mike S. wrote:
<snip>
>
> Date: 11 Mar 94 21:34:21 EST
> From: Stewart Fist <[email protected]>
> Subject: GSM and TDMA Problems
>
<snip>
1994?
--
Ted
I wasn't born in Texas but
I got back here as soon as I could
(Don't forget to take out the trash)
A metal's temper doesn't mean it is angry.
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