Dear Srs,
We are working in a project that uses a GSM modem to send a GMSK beacom in 904 MHZ with 2W.
This beacom send a random bits, but we only need to measure the RSSI
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 ?
Best Regards
Carlos Cecanecchia Neto
www.mobipower.com.br
55-11-3257.7736
http://www.mobipower.com.br/ New Picture (2)
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,
No. This not a open hardware / open source project. It is for car localization, in case of jammer use, that blinds the GPRS modem.
We tried to sniff that frequency, but was impossible, due the saw filters in the GPRS modems (that only allow the to receive the uplink channel), and
for economic reasons. We to make a 20 units like this and we have a reduced budget.
Do you think that is possible ?
How much you think will cost a solution like that ?
Regards
Carlos Cecanecchia Neto www.mobipower.com.br 55-11-3257.7736
-----Mensagem original----- De: Harald Welte [mailto:laforge@gnumonks.org] Enviada em: domingo, 11 de março de 2012 15:35 Para: Carlos Cecanecchia Neto Cc: baseband-devel@lists.osmocom.org Assunto: Re: osmocom
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.
baseband-devel@lists.osmocom.org
-
Carlos Cecanecchia Neto -
Harald Welte