Hi

> The a-band is a mix of AMPS only, CDMA & AMPS or TDMA & AMPS. Their area
of
> coverage is also different than the b-band networks.
>
> GSM is the newest networks in Brazil, therefore it has the smallest
coverage
> areas. Brazil was divided into 3 regions for the purpose of the GSM
license.

> It's a tough call. I wish the guy luck. If he needs data coverage of all
of
> Brazil for 8KB of data, may I suggest that he look into a commercial HF
> frequency. If he can narrow his service area, perhaps CDPD, TDMA Circuit
> Switched Data, or CDMA Circuit Switched Data may be the solution. Also,
> Nextel is in Brazil & they have some kind of data service. I do not know
> details of their coverage area.

    Oh Yeah !!! That is really my country. Now you can imagine why I have to
find something that works on any phone. What a mess people have made with
our cellular network. And it is quite different from the US where the system
got to have different systems because of new technologies. Our network is
quite new and people could have regulated it to have just one system running
but that would not be fun :-)

    It is weird when we have full coverage of cellular telephony and it is
so mixed up with different systems that old HF radio would be the only
option it I were to use it all the time. Managers, marketing and politicians
can really kill any good technology !

    Jim, thanks a lot for the information, it will be very usefull when I
have to transfer bigger volumes of data in one of those areas that are
testing the data systems.

    I will start tomorrow testing how bad the signal passes trough the cell
phones. By the info gathered so far I will probably try a microprocessor at
each end with high degress of redundancy on the data and heavy filtering of
the signal on the receiving end. If the voice passes I will find a way to
pass the small amount of data I have :-) It started as a simple thing to do
and ended up as a challenge. I am quite sure it is doable despite the
difficulties.

    Thanks for everyone for all the information. I will keep you informed of
how it goes..

Best regards,
Alexandre Guimaraes

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