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'[OT]: use of GSM off the network'
2001\06\01@043201 by John Walshe

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Hi Guys,
   Does anyone know of a way to use a GSM phone in a "walkie-talkie" type
of configuration without using any cellular networks. I have two that were
left behind by upgrading and it would be very handy to use them for two way
communication around my home area(which incidentally is a cellular blackspot
!). Is there some way to stop the phone searching for a network. Any info
would be welcome

John

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2001\06\01@063018 by Kari Lehikko

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John,

AFAIK, the information transfer between two mobile stations is not
defined. (Anyone, correct me if I am wrong!)

In case a PP-protocol WOULD exist, you must be able to upgrade the
software of the telephone to change the protocol. (Source codes,
compilers, programmers...) Also, parts (or all) of the protocol might be
implemented with hardware.

Maybe you should consider building your own Base Station. (and
SIM-cards) *smirk*
Of course, there might be laws against it.

If someone would point a gun at me and force me to build a
GSM-connection without public network, I would probably either desing a
brand new GSM-phone from a scratch and implement a PP protocol in it
(leaving extra stuff like dialling out) or desing a base station.
(Hopefully nobody never does... :)

- Kari -

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2001\06\01@071510 by J.Feldhaar

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Hello List

I've often speculated when HAMs are going to build their first AGSM set
(Amateur Global Standard mobile) for sending SMS and phoning (but restricted
to amateur bands, using the existing phone hardware is not so easy...also
see below...

I am waiting for other constructive ideas in this area.

Greets
Jochen Feldhaar
DH6FAZ

Kari Lehikko schrieb:

{Quote hidden}

What about the needed frequency band: The GSM protocol knows up to three
bands, 900, 1800 and 1900 MHz. Anyone following the auction of UMTS
frequencies here in germany knows that companies pay A LOT!!! of money for
these frequencies, and here the law comes into the picture, protecting the
exclusive use of these frequency bands for the appointed operators.
Sorry, bad luck this way...

{Quote hidden}

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2001\06\01@083742 by Chris Carr

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> Hi Guys,
>     Does anyone know of a way to use a GSM phone in a "walkie-talkie" type
> of configuration without using any cellular networks. I have two that were
> left behind by upgrading and it would be very handy to use them for two
way
> communication around my home area(which incidentally is a cellular
blackspot
> !). Is there some way to stop the phone searching for a network. Any info
> would be welcome
>
> John
>
As the Base Station and the Network behind it controls virtually everything
on your GSM Handset, this is a non-starter. It's not even worth breaking
them apart for useful components these days 8-(

Chris Carr

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2001\06\10@001927 by M. Adam Davis

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I was always under the impression that the phones which contacted each
other directly did so through the network, but since it was all on the
same network they didn't charge you for it.  They simply billed it as
walkie-talkie type communication, but you still had to be within the gsm
area so the network could get you going.

What is the distance limit between two gsm phones that talk to each
other?  Do you suppose that they talk directly when they are close, and
indirectly (network) when they are not?

-Adam

John Walshe wrote:

{Quote hidden}

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