I have the output of a MiniCircuits ROS 1500 VCO (output approx 9dbm) feeding into a MiniCircuits LFCN-1325 low pass filter. In the stopband the VSWR of the filter is 40. Since this will cause large refected signals in the stopband, and since the first harmoinic of the VCO is at about 0dbm, will there be any problems in the VCO with non linearities creating unwanted signals. I know there is a frequency pulling issue, but for my application frequency pulling is acceptable.
By the way, I can't afford to use a pad to eliminate the problem because I need to keep the VCO signal level high enough to drive a mixer.
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