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Doppler radar

Hii everyone

I am working on a project and have to bulit doppler radar. I am using Ni-usrp 2922 in full duplex mode. For testing I am using NI-USRP 2922 in loopback mode and checked for the received power. what I found is while sending a signal at 0dbm, my received power is -80dbm. Since I am using it in loopback mode, there should be no power loss. Please can you tell me the reason for the loss of power. I have used NI-USRP example file Niusrp ex tx async,vi and Niusrp ex rx async.vi.

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