[Discuss-gnuradio] DC Nonexistent Peak at Transmitter

Hi all,

I am trying to create a complex cosine signal in 100kHz and transmit it with USRP in 110MHz using WBX daughterboard. I have observed this signal in an oscilloscope and a spectrum analyzer. It can be seen that there is a nonexistent peak at transmit frequency of USRP. I also added the related photos to be clear. 

Any help would be kindly appreciated.

Sema