Wierd stray signals from my GSM phone

My new GSM phones (we have 3) all generate some sort of RF
interference every hour or so. If you are near a computer, radio,
or any device with a speaker you hear a "beep, beep...beep, beep,
beep...beep, beep". I don't want to tell you what this sounds like
when you are near a guitar amplifier.

Is there some way to shut this "feature" off. This is not a good
thing.

Thanks,

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"Jimmy" <[email protected]> wrote in message
news:[email protected]...
> My new GSM phones (we have 3) all generate some sort of RF
> interference every hour or so. If you are near a computer, radio,
> or any device with a speaker you hear a "beep, beep...beep, beep,
> beep...beep, beep". I don't want to tell you what this sounds like
> when you are near a guitar amplifier.
>
> Is there some way to shut this "feature" off. This is not a good
> thing.
>
> Thanks,

I don't think this is a GSM problem. I've had Verizon phones and nextel
phones do the same thing. In fact, the nextel was the worst, as far as
causing audio interference in nearby devices. -Dave

It's common, it's called the GSM "cricket"
"Jimmy" <[email protected]> wrote in message
news:[email protected]...
> My new GSM phones (we have 3) all generate some sort of RF
> interference every hour or so. If you are near a computer, radio,
> or any device with a speaker you hear a "beep, beep...beep, beep,
> beep...beep, beep". I don't want to tell you what this sounds like
> when you are near a guitar amplifier.
>
> Is there some way to shut this "feature" off. This is not a good
> thing.
>
> Thanks,

Nope. Or at least not while in a call or GPRS session... if it's happening
periodically when not using the phone you can shut off the network time auto
update, but it will still occur during calls and data sessions.


"Jimmy" <[email protected]> wrote in message
news:[email protected]...
> On Sat, 05 Jun 2004 17:13:57 GMT, "Gregg"
> <[email protected]> wrote:
>
> >It's common, it's called the GSM "cricket"
>
> Can it be shut off...other than by shutting off the phone ?

"Gregg" <[email protected]> wrote in message news:<[email protected]>...
> Nope. Or at least not while in a call or GPRS session... if it's happening
> periodically when not using the phone you can shut off the network time auto
> update, but it will still occur during calls and data sessions.

And even a static idle handset must periodically register w/ the
network. Thus, the periodic RF that is being spuriously amplified by
the other electronic components is actually a very important part of
the transparent communication between handset & network.

For CDMA, the registration prompt may be timer-based, distance-based,
or zone-based. I am less familiar w/ GSM registration protocol, but I
assume it to be much the same. Registration w/ the GSM HLR/VLR should
inform that the mobile is still active & update the location of the
mobile.

Spurious amplification does seem to be far worse w/ the time-division
air-interfaces -- GSM, IS-136 TDMA, & iDEN. For each of the
aforementioned, the respective time-division frequency is well w/in
the 20 Hz - 20 KHz bandwidth of most audio components. As such,
switching transients at the time-division frequency or integer
multiple thereof may be audibly amplified.

Andrew
--
Andrew Shepherd
[email protected]
[email protected]
http://www.wirelesswavelength.com/

On 7 Jun 2004 01:16:19 -0700, [email protected] (Andrew Shepherd) wrote:

>Spurious amplification does seem to be far worse w/ the time-division
>air-interfaces -- GSM, IS-136 TDMA, & iDEN. For each of the
>aforementioned, the respective time-division frequency is well w/in
>the 20 Hz - 20 KHz bandwidth of most audio components. As such,
>switching transients at the time-division frequency or integer
>multiple thereof may be audibly amplified.

Isn't this in direct conflict with FCC Radio Interference standards.
You ought to hear what this sounds like next to an amplifier cranking
out a couple watts.

On Mon, 07 Jun 2004 00:31:36 GMT, "Gregg"
<[email protected]> wrote:

>Nope. Or at least not while in a call or GPRS session... if it's happening
>periodically when not using the phone you can shut off the network time auto
>update, but it will still occur during calls and data sessions.

I wouldn't mind if it was happening only during calls. Any idea what
I would need to look for to shut off the "non call" cricket on a
Motorola T720?

Thanks

>
> Isn't this in direct conflict with FCC Radio Interference standards.
> You ought to hear what this sounds like next to an amplifier cranking
> out a couple watts.
>

Nope.


the Cell Phone and the Amplifier are both FCC Part 15 devicies.

A Part 15 device may not cause harmful interference, and must accept any
harmful interference, including interference that causes undersired
operation.

Interference from and to what, you may ask?

FCC Licensed services- such as Radio and TV Transmitters, Fire and Police
Dispatch, Ham Radio Stations, etc-

On Mon, 7 Jun 2004 18:19:57 -0400, "Paw-Paw" <[email protected]>
wrote:

>>
>> Isn't this in direct conflict with FCC Radio Interference standards.
>> You ought to hear what this sounds like next to an amplifier cranking
>> out a couple watts.
>>
>
>Nope.
>
>
>the Cell Phone and the Amplifier are both FCC Part 15 devicies.
>
>A Part 15 device may not cause harmful interference, and must accept any
>harmful interference, including interference that causes undersired
>operation.
>
>Interference from and to what, you may ask?
>
>FCC Licensed services- such as Radio and TV Transmitters, Fire and Police
>Dispatch, Ham Radio Stations, etc-
>

I see... consumer stuff can mess up other consumer stuff, as long as
it doesn't mess with "real" equipment. Yikes.