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.
This information comes from the reference manua (above)l. Operation limitations in the I/Q mode
- All changes (frequency, preamp setting, and so on) made in the I/Q mode are not saved.
- All the settings will be returned to the condition/state before entering the I/Q mode.
- While in the I/Q mode, the receive mode is fixed to “USB,” and “AGC” is forcibly turned OFF.
- Audio output from the internal speaker, external speaker terminal and headphone terminal are muted.
- The audio output from the USB Audio, [AF/IF] terminal and [LAN] port are not muted.
- The Monitor function is forcibly turned OFF.
- Normal scan, Priority scan and Tone scan are not usable. (Forcibly canceled if running.)
- The Recording function is not usable.
- The Memory channel is not automatically changed by the Timer function. (The Automatic Power OFF function is still usable.)
- The BER measurement function is not usable, and forcibly turned OFF if in use.
- “NG (FA)” will be returned to all the commands excepts those related to the I/Q mode: reading and entering the I/Q mode. Setting receive frequency, receive mode transceive and receiving digital signals are disabled.
- The cloning operation using the CS-R8600 is not usable.
- The IF signal from the 10.7 MHz OUT is disabled..
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.