FUNcube Dongle Copyright 2011 Page 6 of 23
2.3 Spur Reduction
The spur in the middle of the display is cause by a DC offset in the dongle. The spur cannot be
completely eliminated but can be reduced considerably.
From the Options dropdown in the FUNcube Dongle pane select Spur reduction. When you do
this the input gain is reduced to the minimum to remove extraneous influences. Select a time
interval and press Start.