On Tue, Nov 16, 2010 at 6:13 PM, Marcus D. Leech <[email protected]> wrote: > On 11/14/2010 02:28 PM, Marcus D. Leech wrote: >> >> 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? >> > So, nobody has answered my question yet. > > Even with the "latest and freshest UHD (master) and GnuRadio (next)", Rx > bandwidths below 400KHz don't appear to work correctly on a USRP2 > with UHD, giving a flat-line at -410dB in the FFT display.
No answer or insight, just another data point. I've been running UHD apps today at 200 KHz sample rates with not problem. Tom _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
