Daily Archives: March 7, 2023

In this new video, Paul, W1VLF shows how the RSPduo together with RSPduo diversity software can help you get rid of a particular local noise source.    His practical demonstration gives a clear example of what is achievable as he pulls both real and reference HF signals out of the noise!:

More about using the dual tuner RSPduo with SDRuno in Diversity mode (taken from the SDRuno manual ):

MRC (Maximal Ratio Combining) Diversity is supported using the RSPduo. Diversity can be used to combine the 2 tuner input streams together to potentially improve the SNR (signal to noise ratio). The same frequency is used for both tuners in the RSPduo and the gain can be adjusted either on each tuner independently or locked together (the default method).   

Diversity mode is enabled by clicking on the RSPduo MODE dropdown and select DIVERSITY. Make sure both the 50 ohm ports are connected to the correct input source and note that the HiZ port is not available for Diversity mode. Trying to use the HiZ port will result in an error message being displayed.
Once diversity mode is enabled, the diversity controller window will appear (shown below). This window shows the current phase and amplitude being applied and the automatic values that are being continuously calculated and applied (if the APPLY AUTO button is pressed, which is the default mode).  

The automatic values have A preceding them in the display.

The automatic mode can be disabled by pressing the APPLY AUTO button and then with the left mouse button pressed down, select a phase (indicated by the angle in the circle) and an amplitude (indicated by the length of the line to be applied to the incoming IQ streams. The phase and amplitude controls can also be independently locked so as to allow finer manual control.
The result of the combination is sent to the rest of SDRuno as a single IQ stream and so all the post processing within SDRuno is still fully functional.

(For noise reduction, as the video explains you use it in manual mode so that the noise signal is subtracted from the wanted signal) 

Click on the picture below for links to  RSPduo product information:

You can purchase the RSPduo direct from SDRplay of from one of our authorised resellers:    https://www.sdrplay.com/purchasehome/

Please note the imminent release of SDRconnect will also support diversity tuning for the RSPduo.