Hi marcus, Thank for your help. Actually my parameters are :
- sample rate is 40 MHz - center frequency 4.3 GHz - Sweep frequency 20 MHz - Samp UP= Samp Down= 65536 - Samp CW = 16 384 - USRP N210 with SBX 400MHz to 4400MHz - Antenna boeing 767 for Altimeter Radio Sink : gain 10 dB , TX/RX Source : gain 10dB , RX2 For transmitting FMCW , I use the toolbox of stefan USRP Sink . Here the flowgraph + configuration http://screenpresso.com/=4tfSb Thank for your help
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