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

2009-02-04 Thread Matt Ettus
Marcus D. Leech wrote: Matt Ettus wrote: There is no low pass filter. Assuming that you are setting the gain properly, then most likely problem is that you blew out the LNA in the front, U4. Static or strong signals can do that. You could try replacing U4, which is an MGA82563. Matt Matt, I

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

2009-02-04 Thread Marcus D. Leech
Matt Ettus wrote: > > There is no low pass filter. Assuming that you are setting the gain > properly, then most likely problem is that you blew out the LNA in the > front, U4. Static or strong signals can do that. You could try > replacing U4, which is an MGA82563. > > Matt Matt, I thought that

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

2009-02-04 Thread Matt Ettus
José Carlos Reyes wrote: 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 the