fldigi is a software package for running a subset of amateur radio digital modes. BPQ can interface with fldigi to either allow users to connect or forward messages using other modes than AX.25.

To make integration easier, you can use a rig control package like flrig to allow both BPQ and fldigi to control the radio on specific port(s).

This example uses an IC-7300 plugged into a Windows computer, using QtSoundModem to interface the radio to BPQ.

• BPQ
• flrig
• QtSoundModem
• fldigi

• Set up flrig to interface/CAT control your radio.
  • The Server `Xmlrpc` port is used in the QtSoundModem PTT config in the next step.
• Set up a regular HF BPQ port if you want. In this example, you can use QtSoundModem and use the `FLRIG` PTT port, which is not available in the UZ7HO Soundmodem this software is based on.
• Set up and start fldigi to act as a server.
  • The KISS `Addr` is the machine running BPQ.
  • The `I/O` port is used in the BPQ port config, below.

• Set up an additional port that uses the BPQ fldigi driver, but on the same radio.
  • The `ADDR` is of the machine running fldigi and the fldigi port.
  • You can set the default mode as in the BPQ fldigi Driver docs.

;**************   Port 7 FLDIGI PSK  *************;
PORT
  PORTNUM=7
  ID=FLDigi
  DRIVER=fldigi
  PACLEN=64
  CONFIG
    ADDR 192.168.0.6 7342
    TIMEOUT=10
    RETRIES=5
    DEFAULTMODEM BPSK125/1700
    UPDATEMAP
ENDPORT

• See BPQ fldigi Driver docs for example connect scripts, that should also work for forwarding.

• BPQ Rig Control docs
• BPQ fldigi Driver docs
  • fldigi screenshot is out of date as of 2025-09
• packet-radio.net instructions
  • Basis for this page
• fldigi Configure ARQ/KISS I/O docs
• QtSoundModem
• UZ7HO Soundmodem