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

[Marcus D. Leech]

On 01/28/2014 09:24 PM, Cheng Chi wrote:

Hi,

I think it's TDMA/FDMA, not spread spectrum. Each channel is about 30KHz.

Best regards,

Cheng Chi

Make sure that you're tuned to the correct frequency, and that your link margins are adequate.  It could be that your antenna has insufficient
  gain for the signals coming from Thuruya.  The Iridium birds are *strong*, and also in fairly low orbits.

You might need a *real* LNA at those frequencies--a GPS LNA would work, except that you'd likely have to remove the 1575MHz filter.

On Wed, Jan 29, 2014 at 10:17 AM, Marcus D. Leech <address@hidden> wrote:

On 01/28/2014 09:14 PM, Cheng Chi 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?

Best regards,

Cheng Chi

_______________________________________________
Discuss-gnuradio mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

Is the Thuruya signal spread spectrum?

-- 
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org

_______________________________________________
Discuss-gnuradio mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

-- 
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org