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 <mle...@ripnet.com
<mailto:mle...@ripnet.com>> 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
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Is the Thuruya signal spread spectrum?
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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