Usually there is a LNA next to antenna, while SDR devices also have gain setting so we can increase the gain.
As i know LNAs are amplifying all signals with same gain (Am I right?)
So i wonder what is the point of LNA here?
if the SDR device can amplify the signal using gain settings why should we use a LNAs?

  • 2
    $\begingroup$ There are two questions with good answers on this subject, the second one gives a detailed rundown of why LNAs help - do these answer your question? $\endgroup$
    – tomnexus
    Jun 6 at 22:17
  • $\begingroup$ @tomnexus: yes thanks, the second link made every thing clear. $\endgroup$
    – Ariyan
    Jun 6 at 23:14
  • 1
    $\begingroup$ awesome! then let's mark this as answered by that for future readers! $\endgroup$ Jun 7 at 11:14


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