srr00 wrote:Hi Steve,
thanks for your reply. I switched off the AGC-Function in SDR Uno but it seems its doing some kind of AGC anyway when crossing the Filter Boundaries cause the RF-Gain Slider is changing by its own.
So my test was not valid i think.
The AGC button on SDRuno is not the IF AGC, it controls the output level. You need to turn of the IF AGC and set the IF gain manually. The RF Gain Reduction control is used to set the gain/attenuation for the LNA.
One thing to bear in mind is that the RSP module will be changing various settings as a sweep crosses a band boundary, and there will be a change in noise level displayed. This change will not be seen when using SDRuno because it is not changing frequencies in order to cover the displayed spectrum. Using manual gain control, IF at 59dB and RF Gain Reduction slider at the bottom, I see a noise floor difference of around 15dB when changing from 419 to 420MHZ. The level difference will change from band to band, and probably between devices as well. Let me know how it goes.