The polarisation loss in your case might be 30 dB. Have a look into that. Regards, Vanush
On Wed, Jan 29, 2014 at 7:45 PM, Sylvain Munaut <246...@gmail.com> wrote: > Hi, > >> I am trying to collect signal from Thuraya-3. Here is the setup I used: >> - USRP N210 + WBX >> - LNA with 30dB gain (ZHL-1217MLN) >> - Iridium Antenna (I don't have specific antenna for Thuraya right now. >> Since Iridium and Thuraya frequency bands are quite close, I suppose it >> would work more or less) >> >> Center frequency: 1530MHz >> Sampling rate: 10MHz >> >> From the spectrum (attached), I can see the Inmarsat signal, but no sign of >> Thuraya signal. Anyone has suggestion about how to receive the thuraya >> signal? > > Several issues to improve : > > - Your antenna has the wrong polarization, this will definitely kill > your signals > - You can also try more directional types of antenna like described > here : https://gmr.osmocom.org/trac/wiki/Receiver_Setup > - Ideally if you have some GSM1800 nearby, it's good to have a filter > as those signals tend to swamp / saturate inputs when amplified ... > > fwiw, I have had some success receiving thuraya by using a GPS antenna > and just using a big metal surface as a reflector (to swap > polarization). > > > Cheers, > > Sylvain > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
