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
Use plain LSB for AFSK. No LSB-D or USB audio input switching. Disconnect the microphone, turn COMP OFF if fitted and check external ACC(1) audio.
| Item | Setting / check |
|---|---|
| Mode | Use plain LSB for AFSK. No LSB-D or USB audio input switching. Disconnect the microphone, turn COMP OFF if fitted and check external ACC(1) audio. |
| 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. |
| ACC(1) (8-pin) pin 2 GND | Connect pin 2 GND as specified by the audio interface. |
| ACC(1) pin 3 SEND | A compatible PTT circuit grounds ACC(1) pin 3 SEND. Use ACC(1) pin 3 SEND for external PTT. The rear RCA SEND jack controls external equipment during TX; it is an output, not an input to start radio TX. |
| CI-V Address | Default 04h. 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 | Start with low PC/interface/PSRTTY TX volume. There is no USB MOD Level setting on the radio. |
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 in plain USB through the same external audio device, keep wiring/gain first, switch the radio to LSB and test RTTY. Do not switch to LSB-D.
PSRTTY settings · AFSK
In PSRTTY 1.16 select external PTT and match the compatible interface COM, RTS/DTR and polarity. CI-V CAT, audio and PTT are separate paths. Automatic mode switching on connection OFF; select plain LSB on the radio. Choose explicit external Audio IN/OUT and the exact radio model.
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.