Nonexisted peaks USRP N210 Connection

Hi All,

I want to do a transmit receive application with USRP Network series,
with USRP N210s. I have used WBX TX/RX as transmitter and TVRX2 TX/RX
part as receiver. I used 206MHz as center frequency. Here is my
transmitter blocks

And my receiver blocks in GRC

My receiver graph before transmitter begin to transmit:

My transmitter graph when i begin to transmit, first one is zoomed up

and zoomed in down part.

And finally my receiver graph is the following graph. As you see there
is a DC peak that i didn’t send in the transmitter end.

I tried so much time but each time i saw this peak when i work in this
frequency (also other high frequencies). When i shift center frequency a
little bit then four of them shifting together. So it is together with
other three.

What is the reason of this peak. İs it because of transmitter or
receiver? When i use relatively low frequencies as center frequency (for
example 50MHz or 60MHz) then the DC peak is disappearing. (I attached
the images.)

Any help would be kindly appreciated.Sema

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