On 12/14/2011 01:55 PM, Evan Merewether wrote: > I have been looking more at the performance of the udh_cal_* routines to try > and understand the operation of my N210 and the SBX card. I found the cal > files that I had previously generated and moved them into a separate > directory to prevent the UHD driver from finding them. From the > documentation, I think this should apply no corrections. Then I removed the
correct > antennas and terminated both inputs with 50 ohm terminators, running > uhd_fft.grc with a frequency of 2.0087MHz (which is away from other spurious > signals and near a calibration point), a sampling rate at 5M, a 2.048k FFT > size, and an average of 0.004 produces a graph where I can observe both the > average leakage power of the LO and the average noise floor. This produced > data for the LO [A - -99.21 dB, FFT: -106.14 dB] and noise [A: -117.138, > FFT: -117.1 dB]. > So you are measuring the transmit LO leaking into receive? Which means uhd_fft.grc is both transmitting and receiving? > Can anyone tell me what mistake I am making? > > The cal utilities are for suppressing IQ imbalance on RX and TX and DC level on transmit. I dont know exactly what uhd_fft.grc is, but I dont think you are measuring IQ suppression or TX DC level. -Josh _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
