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[Discuss-gnuradio] TVRX flatness + USRP gain setting?


From: Weber, Michael J. \(US SSA\)
Subject: [Discuss-gnuradio] TVRX flatness + USRP gain setting?
Date: Fri, 21 Oct 2005 17:33:22 -0400

What is the recommended position of the USRP gain setting when using the
TVRX daughtercard?

Looking at the FFT plots, if the gain is maxed out it appears that the
signal drops about 13dB from center to edge, regardless of the bandwidth
of the decimated signal. I.E, if the signal is 640KHz wide, the edges
are 13dB down from the center, and if the signal is 4MHz wide, the edges
are still 13dB down from the center. At minimum gain, the edges seems to
drop about 6dB, but the input from the TVRX goes deaf at that setting.

Is there a way to have a flatter signal response across the bandwidth
and still have gain?

Thanks!

Mike




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