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HMC363S8G eval board noise at Low Frequency


We are using eval board for the HMC363S8G and have some noise issues at lower frequencies.  The performance is good at input frequencies above 100 MHz, but when I lower my input frequency to 30 MHz (3.75MHZ output) I start to see spurs above the noise floor at various frequencies (11.25MHz, 18.75MHZ, and 26.5MHz) these are not expected.  My fundamental is -40dB.  Input level is at 4dBm.   Further, when I decrease my input frequency to 16MHz, I see no output spectrum other than white noise.

Can you help explain what I am doing wrong?

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