Harald Welte laforge at gnumonks.org
Sun Mar 11 18:34:32 UTC 2012

Hi Carlos,

On Sat, Mar 10, 2012 at 08:06:05PM -0300, Carlos Cecanecchia Neto wrote:
> We are working in a project  that uses a GSM modem to send a GMSK
> beacom in 904 MHZ with 2W. 

Is this an free software / open source / open hardware project? 

> Visiting you site, we found a GSM RSSI software working in a phone.  
> Can we use it in 904 Mhz ? This is the uplink GSM ARFCN channel 70. 
> It is possible ?

Yes, in general this is possible.

You will have to remove the receive filter of the phone, as it is
described in http://bb.osmocom.org/trac/wiki/Hardware/FilterReplacement
and replace it with soem baluns.

Please also note that the measurements at the moment are completely
uncalibrated.  If you need precision, I would suggest to calibrate each
phone individually.

- Harald Welte <laforge at gnumonks.org>           http://laforge.gnumonks.org/
"Privacy in residential applications is a desirable marketing option."
                                                  (ETSI EN 300 175-7 Ch. A6)

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