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ad9361 third harmonic is too large

We now use ad9361 to send a sine wave out at the frequency of 520MHz. And then see the spectrum of the local oscillator found in the third harmonic 1560MHz signal is too large, and my own signal only 14 different dbm, is that normal?

And I serach the ad9361 datasheet, I haven't seen the qouta of the LO harmonic.

 Is there any effective way to suppress this harmonic?

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