Connection
Connect rear USB to the PC with a data cable. USB carries CI-V and TX/RX audio; no separate audio interface is needed. Install the official driver and choose IC-7200 CI-V COM and USB audio.
Radio settings · AFSK
Hold M-CH/RIT [SET] for 1 second for Quick set, then hold again for Set mode. Select with M-CH, change with DIAL. TX input: Modulation input (Data ON); gain: USB Level. These correspond to other models’ DATA MOD/USB MOD Level, with different names.
| Item | Setting / check |
|---|---|
| LSB + DATA MODE | Select LSB and set DATA MODE to on in Quick set. PSRTTY calls this LSB-D. Do not use native RTTY mode. |
| Modulation input (Data ON) | Select U (USB). Default A (ACC) does not route USB audio to TX. |
| USB Level | Keep the working FT8 value first. Factory default: 50%. Adjust with PSRTTY TX volume. |
| Audio IN / Windows recording level | Select USB audio for Audio IN and check Windows recording/PSRTTY RX levels. Do not apply other models’ USB AF/IF Output menu steps. |
| CI-V Address | Default 76h. Match PSRTTY to the radio’s actual CI-V address. |
| CI-V Baud Rate | Match CI-V Baud Rate and PSRTTY. Even with Auto, select the correct CI-V COM. |
FSK keying transmission · Ver1.18
Example: DTR for FSK and CI-V/CAT for PTT. Adjust settings to your wiring and selected signals.
Serial keying for TX; Audio IN for RX. Neither primary nor secondary Audio OUT is used. Check radio RTTY mode, 170 Hz shift and Mark frequency. Keying polarity is independent of RX inversion.
The manufacturer manual uses the ACC RTTY keying input for FSK. A separate serial port and a suitable FSK interface are required. A USB socket does not mean FSK is available with only a USB cable. Never connect RS-232 signals directly to ACC.
Radio settings
| Radio item / connection | Setting / matching |
|---|---|
| FSK input / keying | ACC (13-pin): RTTY / FSK |
| Serial connection | Use a separate FSK COM port from CAT for this model. Check the connection and avoid PTT signal conflicts. |
| Operating mode | RTTY / RTTY-R |
| RTTY shift | 170 Hz |
| RTTY Mark frequency | 2125 Hz |
| PTT (TX/RX switching) | Do not assign the same line to PTT and FSK |
| Audio IN | Use the usual receive audio input |
The manufacturer manual uses the ACC RTTY keying input for FSK. A separate serial port and a suitable FSK interface are required. A USB socket does not mean FSK is available with only a USB cable. Never connect RS-232 signals directly to ACC. With external control set to radio PTT, a dedicated FSK COM can share different lines, for example FSK=DTR and PTT=RTS. Keep this port separate from CAT and never assign both functions to one line.
Keying polarity mapping
| PSRTTY inversion | DTR OFF | DTR ON |
|---|---|---|
| Not inverted | Mark | Space |
| Inverted | Space | Mark |
This table maps PSRTTY control signals. It is independent of A/B selection and RX decoding inversion. Start without inversion, then match the radio/interface polarity.
Manufacturer reference: manual / USB port settings (IC-7200)
If FT8 already works
FT8 in USB + DATA on shares Modulation input (Data ON) and USB Level with LSB + DATA on. Plain USB with DATA off uses Modulation input (Data OFF); set the Data ON input separately to U (USB).
PSRTTY settings · AFSK
Select IC-7200 and CI-V CAT PTT. Explicitly select its USB CI-V COM and the same IC-7200 USB audio device for Audio IN/OUT. Start with LSB-D. Close other apps using that COM.
No modulation
Compare FT8 and PSRTTY output devices → verify LSB-D after connection → check Modulation input (Data ON) = U (USB) → check USB Level and PC/PSRTTY transmit volume. Start with low audio and observe radio power and ALC.
Official sources
Based on official IC-7200 documentation. Menu names/positions may vary with firmware or language.