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Ravings of an old Techie: Cheap and easy to build digital modes USB interface for Ham Radio.
TinyGate – IW3AUT
Cheap USB interface to connect Ham radios and other devices to the PC | Guysoft's Weblog
Ham / Shortwave SWL Radio to Computer USB Interface : 4 Steps - Instructables
RigExpert ham radio interfaces - Radio/TV transmitter superstore
Tindie Blog | Scan the airwaves with this USB HAM Radio interface!
Digirig - integrated digital modes interface for amateur radio | eBay
micro KEYER III Amateur Radio first 24-bit USB Audio Transceiver Interface | eBay
Amazon.com: Digirig Mobile - Integrated Digital Modes Interface for Amateur Radio (Rev 1.9) : Electronics
DXP
Ham Radio CAT, PSK31, FT8, JT9 and JT65 Interfaces - Home Page
Digirig Mobile – digirig
USB Rig Interface - SARCNET
Amazon.com: Portable Radio Interface, Radio Interface Module for Ham Allstar UHF, Radio Interface with Frequency Range 420‑450MHz Module for RPi2 RPi3 RPi4 : Electronics
Signalink USB from Tigertronics: Radio interface and sound card
Ham radio Homebrew soundcard interface with cheap sound card - YouTube
USB Digital Interface for HAM-radio (CAT, CW/PTT, USB-audio) - Share - PCBWay