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[Discuss-gnuradio] bandwidths< 400Khz no longer work with USRP2

From: Marcus D. Leech
Subject: [Discuss-gnuradio] bandwidths< 400Khz no longer work with USRP2
Date: Sun, 14 Nov 2010 14:28:23 -0500
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10

I did a "git pull" for both UHD GnuRadio yesterday.  I'm on the "next"
branch for gnuradio, and on
 "master" for UHD.

Since doing a rebuild yesterday, bandwidths below 400KHz no longer work
on the USRP2.

I did a test with a dead-simple flowgraph:

UHD single source-->multi-const x 32767-->FFT

For bandwidths >= 400KHz, the resulting FFT, with my existing RF
front-end with 40dB gain feeding
  the BASIC_RX on my USRP2, the FFT looks just fine (showing a level
around -40dB).

But anything below 400KHz bandwidth (I tried various bandwidths between
200KHz and 400KHz),
  produces an FFT with nothing useful in it, and a "level" around -400dB.

This used to work just fine below 400KHz. What happened?

Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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