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[Discuss-gnuradio] nonexisted peaks USRP N210 Connection

From: s k
Subject: [Discuss-gnuradio] nonexisted peaks USRP N210 Connection
Date: Thu, 2 Aug 2012 14:12:14 +0100 (BST)

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

 Satır içi resim 4

And my receiver blocks in GRC

  Satır içi resim 3

My receiver graph before transmitter begin to transmit:

  Satır içi resim 2  

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

Satır içi resim 5

and zoomed in down part.

Satır içi resim 6

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.

   Satır içi resim 1

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.


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