RFSpace SDR-IQ Question on Gain settings GNU Radio osmocom Source
gs-raven at comcast.net
Fri Dec 21 23:19:30 UTC 2018
Hello, I hope this is the correct list to ask this question.
I have an SDR-IQ connected via USB to Ubuntu 18.04 and version 18.104.22.168
GNU Radio. I am getting data from the source at correct center
frequency and sampling rate, however ...
I am having trouble find 3 of 4 gain controls.
I believe these to be the settings affecting the device gain:
1. RF Gain: -20, -10, 0, 10 dB. These I can successfully change via
the RF Gain setting in the Osmocom source. It's good!
2. IF Gain: 24, 18, 12, 6, and 0 dB. This is a "digital gain" and
changes a coefficient of the "6620 Digital Downconverter", which
apparently is hardware in the SDR-IQ which does filtering and
3. Preamp Gain, via a "GN Code" of range 0-127, which goes from Off,
and then a range of -8.08 to 34 dB.
4. A step attenuator with 0 and 10 dB settings.
I got the above by examining the "SpectraVue" Windows application for
the SDR-IQ provided by RFSpace.
#1 is no problem, it works. What about 2, 3, and 4?
So is there any hope of controlling these settings with the osmocom
More information about the osmocom-sdr