Re: [Discuss-gnuradio] Inconsistant Gain in X310

2014-11-21 Thread Marcus D. Leech
On 11/21/2014 10:17 AM, Daigle, Andrew - 1008 - MITLL wrote: Hello, I am running into a small issue with the X310 USRP. My basic setup involves receiving from two antennas (or at this point CW tones from signal generators) using two basic RX daughter cards. My problem is that when I pump in

Re: [Discuss-gnuradio] Inconsistant Gain in X310

2014-11-21 Thread Ben Hilburn
Hi Andrew - What you describe is very strange. There is nothing in the USRP that changes dynamically based on the input power level (there isn't even AGC). The only thing I can think of is that somehow the built-in DC offset calibration is going haywire. Are you setting the center frequency direct

Re: [Discuss-gnuradio] Inconsistant Gain in X310

2014-11-21 Thread Ben Hilburn
Hi Lou - By default, the RX DC offset is enabled. You can disable it with a quick multi_usrp call: http://files.ettus.com/manual/classuhd_1_1usrp_1_1multi__usrp.html#a7beb49c1a04a81b3e7569db482453746 Cheers, Ben On Fri, Nov 21, 2014 at 10:08 AM, madengr wrote: > Might want to post this over o

[Discuss-gnuradio] sdr-iq on mac 10.7 or 10.9

2014-11-21 Thread Alexander Tudor
Greetings: My installation consists of: a) OSX 10.9 or 10.7 b) gnuradio 3.7.x installed through mac ports, c) osmosdr (because of its support for SDR-IQ within gnu radio companion) installed through mac ports. My goal is to use SDR-IQ within gnu radio companion but wanted to proceed in smaller

Re: [Discuss-gnuradio] Inconsistant Gain in X310

2014-11-21 Thread madengr
Might want to post this over on the Ettus list, as I am having issue with the X310 and LFRX and have a few threads on there with examples of diagnosing it. The DC compensation seems to be always on (bad since the LRFX is DC coupled), and the digital gain setting seems broke. These may be related

[Discuss-gnuradio] Question about Plotting the Spectrum(Power against frequency) with usrp_sense.py

2014-11-21 Thread Leo Yang
Question about the spectrum plot of the usr_sense.py: I have modified the old usrp_spectrum_sense.py to fit the latest version of gnuradio, and now I can run the program and export the m.data into a txt file, I wonder how to plot the dynamic graph of power against frequency for the visualization of

[Discuss-gnuradio] Inconsistant Gain in X310

2014-11-21 Thread Daigle, Andrew - 1008 - MITLL
Hello, I am running into a small issue with the X310 USRP. My basic setup involves receiving from two antennas (or at this point CW tones from signal generators) using two basic RX daughter cards. My problem is that when I pump in a -50 dBm CW tone to channel A the FFT plot makes sense in that