Connection
Connect rear REMOTE (CI-V) to the PC using a compatible CI-V interface. Connect external sound hardware/radio interface to ACC(1) (8-pin). A USB CI-V cable alone carries no audio. TX: PC output → MOD; RX: AF → PC input.
Radio settings · AFSK
Select LSB and turn DATA ON. Check the DATA indicator. External PTT mutes the microphone, but microphone PTT enables it; disconnect the microphone. No USB audio input setting.
| Item | Setting / check |
|---|---|
| Mode | Select LSB and turn DATA ON. Check the DATA indicator. External PTT mutes the microphone, but microphone PTT enables it; disconnect the microphone. No USB audio input setting. |
| ACC(1) (8-pin) pin 4 MOD | Interface TX audio → ACC(1) (8-pin) pin 4 MOD. |
| ACC(1) (8-pin) pin 5 AF | ACC(1) (8-pin) pin 5 AF → interface RX input. Normally independent of the AF knob. Fixed side is independent of AF knob; SP side follows AF. Keep working FT8 settings. |
| ACC(1) (8-pin) pin 2 GND | Connect pin 2 GND as specified by the audio interface. |
| ACC(1) pin 3 SEND | Compatible PTT interface grounds pin 3 SEND to transmit. A CI-V cable alone cannot operate this PTT line. |
| CI-V Address | Default 16h. Match PSRTTY to the radio’s actual CI-V address. |
| CI-V baud (PC) | Standard: 1200 bps. If FT8 CAT works, use that baud rate in PSRTTY. On these older models the setting is internal, not a front-panel menu item. |
| Audio TX level | Adjust ACC input with front DATA LEVEL, independent of MIC GAIN. Manual input condition: 600 Ω/3 mV rms. Match interface/PSRTTY output from low levels. |
| Front panel → DATA LEVEL | Adjust ACC input with front DATA LEVEL, independent of MIC GAIN. Manual input condition: 600 Ω/3 mV rms. Match interface/PSRTTY output from low levels. |
| MAIN S4 → AF output | Fixed side is independent of AF knob; SP side follows AF. Keep working FT8 settings. |
FSK keying transmission · Ver1.18
Example: DTR for FSK and CI-V/CAT for PTT. Adjust settings to your wiring and selected signals.
The manufacturer manual specifies AFSK operation for this model. Native direct FSK keying is not supported; use normal AFSK mode.
If FT8 already works
If FT8 works through the same ACC audio, keep wiring/gain and change USB to LSB. Check DATA ON and retain external PTT.
PSRTTY settings · AFSK
Select IC-575, CI-V COM and explicit external Audio IN/OUT. Automatic mode switching on connection OFF; set the radio mode described above. Select external PTT and match interface COM, RTS/DTR and polarity. Close apps using the same COM.
No modulation
Compare FT8/PSRTTY output devices → check radio mode → TX audio to MOD and RX audio from AF → interface levels. If CAT works but no modulation, check audio cable and Audio OUT first.
Official sources
Based on official manuals for each model. Check pin numbers in the rear-view diagram. For generation or regional differences, follow the manual for your radio.