AX.25 APRS with UISS and IC-705

Updated 2025-05-14 (updated web links)

This is a very fast guide to set up the IC-705 with UISS for sending AX.25 packets and APRS.

Download and install UISS. During installation, install the Soundmodem software TNC.
Download the file ptt-dll.zip from Soundmodem webpage. Unzip and copy the files (CAT and PTT dll files) to your UISS folder.
Set the radio to FM-D (Data) and select the frq for APRS (in Sweden 144.800 MHz).
Start UISS
Setup UISS with your callsign and your location:
In Soundmodem, set the Sound Card device to your IC-705 USB audio card.
In Soundmodem, set the PTT Port to CAT and radio IC-705. The COM-port should be the one that IC-705 uses for CI-V.
Now you should be able to see traffic
Now send your first APRS Position. Use digipeater if you like.
The IC-705 now sends your APRS location.
If everything is OK you should be seen on aprs.fi