strange noise floor and rf gain control issue

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jlegere
Posts: 4
Joined: Tue Dec 12, 2017 11:01 am

strange noise floor and rf gain control issue

Post by jlegere » Fri Dec 15, 2017 11:07 am

Is the rf gain control simply a visual thing now?

I ask this because I was trying to see the difference between the rsp2 noisefloor as various gain settings. I set theFFT averaging to 1024 in order to smooth out the spectrum display so that I could see what the average noise floor was as max gain. it took a few moments for the FFT sample to get averaged out and for the spectrum to settle. however, when I changed the gain setting the change to the displayed noise floor was instant. like the only thing that changed was the way the spectrum was displayed. I would have expected a delay as the noise floor rose or fell due to the setting change. Is the gain setting actually changing the LNA level and the Gain setting?
Last edited by jlegere on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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