Mehdi,
That’s a good summary. A preselector really helps eliminate spurious responses from out-of-band signals, but adds noise figure.
Our products with preselectors (BB60D and SM200) are ideal for spectrum monitoring and harmonics measurements.
Our low-IF architecture products (SM200 and SP145) have the best dynamic range and flattest IF, making them ideal for modulation analysis.
For many applications, preselection can be accomplished with an external band pass filter. Mini Circuits is a good source for these.
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