rtl-sdr gain control

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iu1mrd
Posts: 1
Joined: Wed Oct 16, 2019 1:40 pm

rtl-sdr gain control

Post by iu1mrd » Wed Oct 16, 2019 1:51 pm

Hi all.
Some digital decoding can't be done with AGC "on" and they need a manual fine setting of gain.
I find difficult a fine setting using the "slider" in the standard "device controller" pop-up.

Anyone has the same problem? Anyone knows a better and granular way to set the gain?

(by the way the "standard" controller come from OSMOCOM?)

73 de iu1mrd - gio

hotpaw2
Posts: 109
Joined: Sat Jan 14, 2017 11:07 pm
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Re: rtl-sdr gain control

Post by hotpaw2 » Wed Oct 16, 2019 6:58 pm

It seems the R820T2 only has a fixed number of gain steps.
See the available gain table(s) in the source code:
https://github.com/osmocom/rtl-sdr/blob ... er_r82xx.c

CaptainNemo
Posts: 2
Joined: Fri Mar 27, 2015 2:49 pm

Re: rtl-sdr gain control

Post by CaptainNemo » Fri Oct 18, 2019 7:00 pm

Thank you for your answer.
It was not evident from the R820T datasheet.
gio

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