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
Thank for your help