rtl-sdr.com

>my W10 seems to have .NET 4.7

No, the same as yours actually.
Alan

Well, I'd try the Airspy group again, prog does have his bad days but usually helps.
But what is "Framework Version: v4.0.30319" my W10 seems to have .NET 4.7

Alan

SDR# questions reach the author here https://groups.io/g/airspy
Alan

The display is Hz.
So 4625Khz x 1000 is what you enter.
Alan

Noise can be due to many things, including local interference.
You need to identify the problem.
If it is a RTL dongle keep gain as low as possible, it overloads.
Filters for the frequencies you want can be very useful depending on your circumstances.
There is no easy answer.
Alan

I wrote this some time ago. https://sites.google.com/site/g4zfqradi ... gle#Eeprom I used this with HDSDR.
At the bottom are links to the latest utility written by Joanne.
I guess there are also links and information on this site, most things are covered.
Alan

https://airspy.groups.io/g/main Last post July 24 2019
Alan

If I understand you correctly you can use two separate instances of the software.
One instance for each dongle.
Selection will be random unless you rename a dongle, possible but I do not have the link right now.
Alan

I had the same message with HDSDR v2.8

(If Zadig has not been used HDSDR just says no RTL found.)

Alan

If it is possible then I'd think a setting parameter would be published or shown by the help function.
The way I would try is to use a SDR program with bandwidth control.

Alan