I had been looking around for some time if someone had already managed to get I/Q data from Icom's IC-7610 HF transceiver without going through the binary-only hdsdr driver provided by Icom, but couldn't find anything.

First attempts at doing that on Debian Linux using libftdi1 didn't work, so I resorted to using the (again binary-only) libftd3xx driver from FT, and succeeded after some tinkering around.

The program writes raw I/Q data to a file in int16-int16 format.

• ic7610ftdi: https://github.com/df7cb/ic7610ftdi
• Get libftd3xx from https://ftdichip.com/drivers/d3xx-drivers/
• IC-7610 I/Q port reference: https://www.icomjapan.com/support/manual/1792/
• The IC-7610 needs to be connected using a decent USB 3 cable, preferably without any hub in-between
• If the SuperSpeed-FIFO Bridge disappears after some time, re-plug the cable or power-cycle the transceiver

$ lsusb | grep IC
Bus 002 Device 024: ID 0c26:0029 Prolific Technology Inc. IC-7610 SuperSpeed-FIFO Bridge

$ make
cc -Wall -g   -c -o ic7610ftdi.o ic7610ftdi.c
cc   ic7610ftdi.o  -lftd3xx -o ic7610ftdi

$ ./ic7610ftdi iq.cs16
Device[0]
    Flags: 0x4 [USB 3] | Type: 600 | ID: 0x0C260029
    SerialNumber=23001123
    Description=IC-7610 SuperSpeed-FIFO Bridge
fe fe 98 e0 1a 0b fd ff
fe fe e0 98 1a 0b 00 fd IQ data output: 0
fe fe 98 e0 1a 0b 01 fd
fe fe e0 98 fb fd ff ff OK
RX 42 MiB ^C
fe fe 98 e0 1a 0b 00 fd
fe fe e0 98 fb fd ff ff OK

$ ls -l iq.cs16
-rw-rw-r-- 1 myon myon 44040192 26. Aug 22:37 iq.cs16

$ inspectrum -r 1920000 iq.cs16 &