For more information about the topics below read "I/Q OUTPUT REFERENCE GUIDE iR8600 COMMUNICATIONS RECEIVER" on the ICOM website [link].
While the IC-R8600 is in the I/Q mode, [REMOTE] LED lights and the IC-R8600 is in the “Remote controlled mode,” thus you cannot operate the IC-R8600.
To exit the I/Q mode, send the command that cancels the mode, or push the [LOCAL] key on the IC-R8600 front panel. Turning OFF the IC-R8600’s power also exits the I/Q mode.
The I/Q data contains a DC component that is produced in the signal processing. The DC component appears as a constant frequency component positioned at the center frequency (0 Hz). Although this is removed in SDR Console it is recommended that you do not tune stations to the centre of the display as the spur removal code will affect this signal as well.
The software allows you to select the bit depth from the ribbon bar's Home pane (first start the R8600). At 5.12MHz the maximum bit depth is 16 bits, for all other bandwidths the maximum bit depth is 24 bits. A higher bit depth supports better blocking dynamic range but requires a higher USB throughput.