Re: [Discuss-gnuradio] Problem with receiving signal from satellite Thuraya-3

[Vanush Vaswani]

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 <address@hidden> 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
>
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