You are not seeing harmonics. You are seeing DC offset, which you have
not corrected for. Also, you seem to be transmitting a very low power
which results in your signal being below the DC offset level.
Matt
Quoc Lai wrote:
Hello,
I am a beginner with USRP. Please help with my problem.
Please see the attached two pictures captured by a spectrum analyzer. In
usrp1_64MHz_harmonic.JPG, I just powered up the motherboard without any
daughterboard. I guess the harmonics comes from the fact that we have
64MHz ADC. In rxf400_4MHz_harmonic.JPG, I transmit ofdm signal at 420MHz
using daughterboard RXF400. Beside the 64MHz harmonic coupling with the
transmit signal, I also see the 4MHz harmonics.
Do you know why these happen and how to mitigate them? I appreciate your
answers.
Thank you,
Quoc
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