Connection
Connect the rear USB Type-B to the PC with a data cable, not the Type-A port. Install Yaesu’s virtual COM driver; identify Enhanced COM and USB audio in Windows.
Radio settings · AFSK
Press FUNC → RADIO SETTING → MODE PSK/DATA. CAT: OPERATION SETTING → GENERAL. REAR selects rear audio; REAR SELECT chooses the USB connector.
| Item | Setting / check |
|---|---|
| Mode / MAIN | DATA-L：Use DATA on the LSB side for AFSK, not native RTTY/FSK. |
| MODE PSK/DATA → DATA MOD SOURCE | REAR: select rear input, including USB; choose USB below. |
| MODE PSK/DATA → REAR SELECT | USB: TX audio from the PC via USB. |
| MODE PSK/DATA → RPORT GAIN | Keep working FT8 gain; adjust with PSRTTY TX volume, starting low while watching power/ALC. |
| MODE PSK/DATA → RPTT SELECT | DAKY: this guide uses CAT PTT, not RTS/DTR. Selecting DAKY does not require an external PTT device for CAT operation. |
| OPERATION SETTING → GENERAL → CAT RATE | Match PSRTTY baud; start with the working FT8 rate. |
| GENERAL → CAT RTS | DISABLE/OFF: disable CAT RTS monitoring, a separate setting from RTS PTT. |
| MODE PSK/DATA → TX BPF SEL / LCUT FREQ / HCUT FREQ / WIDTH | Pass both 2085/2295Hz tones. Start with NAR off; check WIDTH and low/high cuts. |
| MODE PSK/DATA → DATA SHIFT (SSB) | Record working FT8 settings; check dial frequency and carrier position. Changes affect both apps. |
| Audio IN / USB Audio | Select this radio’s USB Audio for Audio IN; check Windows/PSRTTY RX level. Do not confuse rear DATA-jack OUT LEVEL with USB audio settings. |
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.
FTDX101D
Connect the radio to the PC with one USB cable to use FSK. See FSK keying output for the radio settings.
Radio settings
| Radio item / connection | Setting / matching |
|---|---|
| Operating mode | PSRTTY RTTY / RTTY-R corresponds to radio RTTY-L / RTTY-U (RTTY-LSB / RTTY-USB), not the AFSK DATA modes. |
| PTT (TX/RX switching) | Set PSRTTY PTT to CAT |
| CAT | Enhanced COM via USB cable (CAT) |
| FSK keying output | Standard COM via USB cable (separate from CAT) |
| RADIO SETTING → MODE RTTY → RPTT SELECT | RTS |
| RADIO SETTING → MODE RTTY → POLARITY TX | NOR |
| RADIO SETTING → MODE RTTY → SHIFT FREQUENCY | 170 Hz |
| RADIO SETTING → MODE RTTY → MARK FREQUENCY | 2125 Hz |
| Audio IN | Use the usual receive audio input |
Assign different signals to FSK and PTT. PC KEYING / RPTT SELECT in the table is the PTT side; the DTR/RTS selected in PSRTTY is the FSK side. For FSK on DTR, use RTS for the PTT side; for FSK on RTS, use DTR. Even with CAT PTT, do not assign the FSK signal to PTT. Do not infer Enhanced/Standard from COM numbers.
Keying polarity mapping
| PSRTTY inversion | DTR OFF | DTR ON |
|---|---|---|
| Not inverted | Mark | Space |
| Inverted | Space | Mark |
The table shows PSRTTY control-signal logic. Match radio POLARITY TX / TX polarity and interface inversion, then verify Mark/Space with the RY test. RX decoding inversion is a separate setting.
Manufacturer reference: manual / USB port settings (FTDX101D)
FTDX101MP
Connect the radio to the PC with one USB cable to use FSK. See FSK keying output for the radio settings.
Radio settings
| Radio item / connection | Setting / matching |
|---|---|
| Operating mode | PSRTTY RTTY / RTTY-R corresponds to radio RTTY-L / RTTY-U (RTTY-LSB / RTTY-USB), not the AFSK DATA modes. |
| PTT (TX/RX switching) | Set PSRTTY PTT to CAT |
| CAT | Enhanced COM via USB cable (CAT) |
| FSK keying output | Standard COM via USB cable (separate from CAT) |
| RADIO SETTING → MODE RTTY → RPTT SELECT | RTS |
| RADIO SETTING → MODE RTTY → POLARITY TX | NOR |
| RADIO SETTING → MODE RTTY → SHIFT FREQUENCY | 170 Hz |
| RADIO SETTING → MODE RTTY → MARK FREQUENCY | 2125 Hz |
| Audio IN | Use the usual receive audio input |
Assign different signals to FSK and PTT. PC KEYING / RPTT SELECT in the table is the PTT side; the DTR/RTS selected in PSRTTY is the FSK side. For FSK on DTR, use RTS for the PTT side; for FSK on RTS, use DTR. Even with CAT PTT, do not assign the FSK signal to PTT. Do not infer Enhanced/Standard from COM numbers.
Keying polarity mapping
| PSRTTY inversion | DTR OFF | DTR ON |
|---|---|---|
| Not inverted | Mark | Space |
| Inverted | Space | Mark |
The table shows PSRTTY control-signal logic. Match radio POLARITY TX / TX polarity and interface inversion, then verify Mark/Space with the RY test. RX decoding inversion is a separate setting.
Manufacturer reference: manual / USB port settings (FTDX101MP)
If FT8 already works
Keep working FT8 COM/audio/gain. Close FT8; after PSRTTY connects, verify the radio’s DATA mode on the LSB side. Plain USB FT8 uses SSB settings; check the separate DATA input in this table. If using an FT8 PRESET, distinguish its settings from normal settings; recheck input/gain/CAT rate after disabling it.
PSRTTY settings · AFSK
Select FTDX101D / FTDX101MP, Hamlib and CAT PTT in PSRTTY. Specify Enhanced COM, baud and this radio’s Audio IN/OUT. Close FT8 and test connection. After automatic LSB-D, verify DATA on the LSB side. Start on MAIN without split.
No modulation
Check CAT TX and the audio path separately: actual DATA mode → input selection in this table → Audio OUT → input gain/TX volume. For missing RX, check Audio IN.
Official sources
Based on official manufacturer operating/CAT manuals. Names and positions may vary by firmware/region.