Dear all, I have been testing USRP2 with WBX board (#957). Using GNU Radio, I have created a simple CW TX system. The problem: output signal is oscillating when I set the TX frequencies to 900MHz band. Signal output (in time domain) at TX/RX connector from the FSL analyzer is in the attachment.
Settings: 868 MHz, 200 kSps, gain 15 dB Same results with: ./tx_waveforms --rate 250000 --freq 868000000 --gain 15 The oscillation with ca. 1dB amplitude is present for almost all gain settings except the lowest values. I have observed the problem at several frequencies from 700M to 1G, sometimes with amplitude over 2dB. Any ideas about the cause of this problem? Some PA instability or AGC loop issue? Thanks, Ales
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