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Re: [Discuss-gnuradio] Problem with receiving signal from satellite Thur
From: |
Sylvain Munaut |
Subject: |
Re: [Discuss-gnuradio] Problem with receiving signal from satellite Thuraya-3 |
Date: |
Wed, 29 Jan 2014 09:45:20 +0100 |
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