IQ application to playback AM modulation

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Hi everyone,

Specifications

• LabView 2016
• NI-USRP driver : 16.0

I'm trying to create a labview project to record and playback IQ data from AM modulation. 

First Step, I generate a AM signal through a generator with this settings : 

- Carrier frequency : 1 GHz
- AM freq : 2.500 kHz 

This signal is then received by an USRP-2954R through a coaxial cable.

Then In order to do the record, I decided to apply this settings:

- Number of samples : 1000
- IQ rate : 500k
- Carrier frequency : 1 GHz 

Record program

After this step, i created another program to playback my IQ data with these parameters:

- IQ rate : 500k

- Carrier frequency : 1 GHz

Playback program 

Finally, I use a Spectrum analyzer to check the quality of my playback signal. Unfortunately, after many tests, I still can't get a clean signal 

Any suggestions would be most welcome.

Thanks!