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DANL with and without optional Preamplifier

I am using a RSA250X without preamplifier. Which DANL do i reach with and withour preamplifier?

The typical DANL without preamplifier (Reflevel @ -38dBm) should be within -165dBm/Hz which is an excellent value.

With preamplifier you should reach a whopping -170dBm/Hz (Reflevel @ -60dBm) or even better.