DANL (NF) with and without optional Preamplifier

#1 · 16/12/2020, 09:24

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

#2 · 25/06/2021, 13:14

How was this measurement done? With a zero span and 1Hz RBW?

#3 · 25/06/2021, 23:44

The setting does not really matter:

Sweep and real-time mode both offer quite the same DANL same with the RBW setting.