How to eliminate the noise in the signal received from playback ?

[Danan]

Hi, everyone.

I have one USRP 2930( LV 2015, NI-USRP 14) , and I use the NI USRP Record and playback-I16.vi with  USRP 2930 to record a signal transmitted from other device (center = 119.1MHz / gain = 0 / IQ rate = IQ Samples = 1MHz, the same below), then I use the same  NI USRP Record and playback-I16.vi to record the recorded signal , at the same time use my procedure to receive the playback signal. One SMA cable bought from NI  links with the TX1 and RX2 p...

I find that the there are noise  in my received signal from the power spectrum,  the signal amplitud...damped and the precision is not enough .

I want to know how to eliminate the noise in the signal received from playback, and why there are noise after playback?

Thanks.

[jm.arg]

Same problem here, any suggestion?

[Hayfa-BTH]

Same problem, any suggestion?