Notes:
Digital modes require that the audio in and audio out signals to and from the G90 is by way of the
rear ‘ACC’ connector.
Once set up, you may need to adjust ‘Aux In’ and/or the ‘Aux Out’ G90 volumes for proper
operation.
You may also need to adjust the PC’s audio in and/or audio out levels for proper operation.
Some PC interfaces, like the SignaLink USB, has controls to ease this.
In most cases, set up the CAT portion of the digital program being used to specify using the CAT
‘PT’T’ command to activate the G90’s transmit action. Setting up CAT and the G90 for VOX
mode is also possible .. But not detailed here.
The G90’s side ‘CAT’ (computer control of the G90) connector and cable implements a subset of
the common ICOM CIV communications protocol. The author has had success with these CAT
settings far common digital mode programs .. other settings have been found to work by others:
o WSJT-X: Omnirig (Using IC756Pro)
o HDSDR: Omnirig (Using IC756Pro)
o Ham Radio Deluxe: IC7000
o Fldigi: Hamlib & X108G
o Flrig: IC7100 (very noisy on disconnect)
o JS8Call: Omnirig (Using IC756Pro)
The G90 CAT interface requires a baud rate of 19200 for the computer’s serial port.
See the G90 manual for the ACC port Mini-Din 8 pins. Just three pins are used: Aux AF IN. Aux
AF Out and Ground
See this YouTube video for comprehensive digital mode set up ideas from OH8STN:
https://www.youtube.com/watch?v=xRcHVFRUL4U
1. Press ‘POW’ to display ‘Input’. Rotate Main Tuning knob to select ‘Line’.
2. Press ‘POW’ to display ‘MIC Gain’. Rotate Main Tuning knob to select desired Mic Gain level 0 to
20. Higher is more gain.
3. Press Rotate Main Tuning knob to complete the set up.
Note: Later use these steps to switch Mic back to the handheld Mic as the input to resume voice
operations.
1. Press ‘V/M’ button several times to display ‘5. Aux In Volume’
2. Rotate Main Tuning knob to select desired Aux In level 0 to 15. Higher is more gain.
3. Press ‘CMP’ to save the value set
4. Press ‘AGC’ button to exit
1. Press ‘V/M’ button several times to display ‘6. Aux Out Volume’
2. Rotate Main Tuning knob to select desired Aux Out level 0 to 15. Higher is more gain.
3. Press ‘CMP’ to save the value set
4. Press ‘AGC’ button to exit