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receiving stepped-frequency using N210 with wbx daughterboard in full duplex transmission

Hello everyone.

 

I have a a problem in receiving stepped frequency using N210 with wbx daughterboard in full duplex transmission.

Does anyone know why my returned signals for f1, f2, f3, ..., f17 have huge difference in amplitude? Please see attached picture ("received signals.png")

I have tried to run the codes in different environment (indoor). But the received signals have the same pattern as in the attached picture but different amplitude.

 

The parameters that I used:

Number of samples:400

IQ rate 200kHz

number of frequency: 17

start frequency: 100MHz

Stop frequency: 950MHz

 

I am using a dual polarized vivaldi antenna for Tx and Rx

 

Feel free to ask anything about the coding. Thank you.

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