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[Discuss-gnuradio] High noise level reading GSM spectrum.

From: José Carlos Reyes
Subject: [Discuss-gnuradio] High noise level reading GSM spectrum.
Date: Wed, 4 Feb 2009 21:03:14 +0100

Hi all,

 We were reading GSM channels with Tvoid software (http://wiki.thc.org/gsm/tvoid) and at the beginning it worked fine. Suddenly,  we do not how, it seems that noise level has increased in 30 dB approx. and only a few GSM channels can be now identified (but they are all only 10/15dB above noise power, when at the beginning there was at least 40dB) but this channels can be read so we think the front end is not broken, it seems the RF front end is not working properly or its configuration is wrong, but we do not know how we have made it. We think that the LP filter in our dbsrx daughterboard may be working poorly.  I attach you a screenshot of the best received GSM channel (it is only 15dB above noise power).

I expect your help
Thank you for your time.


Attachment: screenshotgsm.png
Description: PNG image

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