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'[PICLIST] [EE] Mobile Phone'
2001\01\08@114909 by WALSH, Scott

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I have seen a couple of products that claim to be able to warn you that your
mobile phone is about to ring, does anybody have a clue as to how these
things work?

regards,
SW.

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2001\01\08@115339 by Alan B. Pearce

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>I have seen a couple of products that claim to be able to warn you that your
>mobile phone is about to ring, does anybody have a clue as to how these
>things work?

The ones I have seen seem to sense the transmitted signal from your phone when
the base station polls it to confirm its presence within the cell. A colleague
had one and it would buzz every time the phone was polled.

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2001\01\08@115531 by Alan B. Pearce

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What I forgot to mention is they are not selective for the phone, so if you had
several people in a group talking, any phone would set off all the ring sensors
in the group.

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2001\01\08@115537 by Bond Peter S-petbond1

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> I have seen a couple of products that claim to be able to
> warn you that your
> mobile phone is about to ring, does anybody have a clue as to
> how these
> things work?

Hold a mobile near a landline (whilst listening to the landline), speakers,
radio etc when a call comes in and see how much interference you get...

The phone negotiates with the basestation for a while before it starts to
ring - you'll hear a "dit-dit-dit" repeated a few times indicating that.
You'll also hear it with position updates.

I've seen a couple of people using an antenna with an LED embedded in it to
pick up some of the radiated energy.

HTH

Peter

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2001\01\08@115958 by Richard Sloan

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My Morotola 550 makes a small click noise from speaker when it is polled!

R.

-----Original Message-----
From: pic microcontroller discussion list
[spam_OUTPICLISTTakeThisOuTspamMITVMA.MIT.EDU]On Behalf Of Alan B. Pearce
Sent: Monday, January 08, 2001 11:54 AM
To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU
Subject: Re: [EE] Mobile Phone


>I have seen a couple of products that claim to be able to warn you that
your
>mobile phone is about to ring, does anybody have a clue as to how these
>things work?

The ones I have seen seem to sense the transmitted signal from your phone
when
the base station polls it to confirm its presence within the cell. A
colleague
had one and it would buzz every time the phone was polled.

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2001\01\08@120032 by Paul Reilly

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> >I have seen a couple of products that claim to be able to warn you that your
> >mobile phone is about to ring, does anybody have a clue as to how these
> >things work?
>

Maybe it was just my phone.... but if I left it beside my computer monitor
at work, I could always tell when it was going to ring by the
interference it caused on the monitor a few seconds before it rung :-)

Paul

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2001\01\08@121022 by Richard Sloan

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Yep seen that also, when in my car I can here some interference on my FM
radio before a ring and during polls.

{Original Message removed}

2001\01\08@131309 by Stein Sem-Jacobsen

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> I've seen a couple of people using an antenna with an LED
> embedded in it to
> pick up some of the radiated energy.
>

It was some talk on this things here in Norway a while ago. The authorities
want to ban the use of such antennas because of the increased radiation it
causes. The LED gets its energy from the transmitter of the phone. Thus
decreases its effective operating range.

The initial question was about a device for detecting when the phone rings.
I saw an article on this in "Electronics World" a year or two ago, or
three... The basic was a reciver tuned to 900MHz (For 900MHz phones) wich
was then amplified to a reasonable level where it could be used trigger a
LED, vibrator or similar warning device. This is a standalone circuit that
does not affect the phones tramitter.

The sound that you hear in the radio (from GSM phones) is the circumference
of its transmitting timeslot to the base station. It equals to 208Hz

Stein Sem-Jacobsen
Norway

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2001\01\08@141744 by Bob Ammerman

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----- Original Message -----
From: Richard Sloan <rsloanspamKILLspamMP3KIT.COM>
To: <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Sent: Monday, January 08, 2001 11:54 AM
Subject: Re: [EE] Mobile Phone


> My Morotola 550 makes a small click noise from speaker when it is polled!
>
> R.

Maybe as the microprocessor comes out of sleep mode to handle the poll?

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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2001\01\09@181756 by dre Domingos F. Souza

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>What I forgot to mention is they are not selective for the phone, so if you had
>several people in a group talking, any phone would set off all the ring sensors
>in the group.

       Maybe. If it has a controlled low sensivity, in a way only a STRONG signal would activate it, it would work flawlessly


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       All the best!!!
       Alexandre Souza
       EraseMExandinhospam_OUTspamTakeThisOuTinterlink.com.br
       Linux User #85093

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