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slowrx is a Linux shortwave listener tool for receiving SSTV using a sound card by OH2EIQ.

Using a PC with soundcard as a VLF receiver, how to use your PC as a receiver for narrow-band signals in the VLF radio spectrum by DL4YHF

A simple PSK31/digital interface which can connect your transceiver to a PC soundcard for digital modes.

Homebrew your PC sound card to radio interface with this circuit obtained from the pages of Ernie Mills WM2U.

Noise Meter software for the noise meter tool by G8KBB that measure noise using a PC sound card and calculate noise figures by means of a calibrated noise source.

Practival project that contains two isolation transformers, one for AF from the tranciever to the line in on a soundcard, and one from the audio out of the soundcard back to the mic / data input of the radio. Both of which are variable inside the interface via two preset resistors.

Modifications to the Tigertronics Signalink USB sound card

Computer to transceiver sound card interfacing by VK2QW

Soundmodem is a free software defined dual-port Packet-Radio TNC that implement a soundcard as a modem and supports AX.25 protocol. Soundmodem has been tested on Windows XP, Vista, 7, 8, 10 and has proved stable in operation. The Soundmodem may be used to build EMCOMM, APRS, BBS, Node station, for satellites

October 2003 QST article on working digital mondes with sound card interfaces

Connecting and configurig an USB Sound Card key to the raspberry Pi to allow digital mode decoding and remote rig applications

The MT-63 modem, constructed around a high speed DSP processor, either in a dedicated external DSP unit like the Motorola EVM, or in PC software using the PC sound card, transmits 64 tones spaced 15.625 Hz apart, in the 1 kHz bandwidth.

Some modifications for the Tigertronics Signalink USB sound card radio interface

MF TeleType is a program for amateur radio digital communication via sound card, ham radio chat program for extra reliable text transmissions over long distance

A MT Hell dos transmitting program by DF6NM

MT-Hell software for 16 bit Soundblaster cards. Sends seven parallel tones with careful dot shaping for minimum interference, and transmits a very nice sound by G3PPT

Interfacing the IC706MKIIG for Soundcard & TNC modes

Background: The PSK31 philosophy, The QPSK mode, Varicode, Sound Card DSP Setup and Operating Tips

Getting Started in PC Soundcard Digital Radio, basics of amateur radio digital modes

Hints and Tips in using the Tigertronics SignalinkUSB External USB Sound Card and Interface

General purpose RTX-PC sound card Interface for MGM (Machine Generated Modulation)

Using external usb sound card devices for amateur radio digital modes operations

Right Mark Audio Analyzer is a suite designed for testing quality of any audio devices, be it a sound card, an MP3 player, a consumer CD/DVD player or a radio.

Sound card based multimeter

JMSK is a software modem that implements a good coherent MSK demodulator that has performance comparable to BPSK. Signals are demodulated from the soundcard. Modulated signals can be routed through the soundcard or to an external device such as a DDS module for direct RF modulation. The advantage of MSK compared to PSK is that non linear amplifiers can be used and has a faster roll off. It is an open source cross-platform program written in C++ Qt.

An improved version of the audio interface commonly used to connect a computer soundcard to a transceiver\'s receive and transmit audio circuits

Article on importance on correct procedure to calibrate your PC sound card for digital mode operations

The program sends morse code audio via sound card and can be used under Windows in Danish only

This article aims to help promote the proper configuration for having a clean signal on the waterfall to avoid interference to other users and also to vastly increase the effectiveness of your signal.

Heil Sound PR-35 vs Heil Sound PR-781 vs Electro Voice Blue Cardinal by K4QKY

A Simple Serial and Sound-Card Interface for the Yaesu FT-857D using an FT232R USB-to-serial bridge chip.

The sudden explosion of new digital modes has taken the Amateur Radio world by storm. New modes such as PSK31 FT8 JT65 FSK441, ISCAT as well as established modes such as RTTY, SSTV, Hellschreiber and others have rocketed in popularity. In order to use these modes all that is required is a simple computer-to-radio interface which couples the computer soundcard to the radio

Super Simple APRS Position Reporter. This project idea has been in response to the more hardware heavy Raspberry Pi projects that involve extra TNC hardware, additional sound cards, and custom cabling. This APRS position reporter is done using a Raspberry Pi B+, USB GPS receiver, Baofeng UV-5R, and a mono 3.5mm audio cable between the Pi and HT.

Simple soundcard interface that can satisfy several requirements like totally isolated AF interface, Totally isolated PTT and CW Key interface, Extend Accessory connector to interface to allow easy connection of TNC and provide a solid PTT or SEND connection

A SSTV interfsace (soundcard) to minimize RF feed back and a soundcard limiter to prevent over driving the soundcard

This project uses an inexpensive Teensy microcontroller as the core of a flexible interface that provides a high-fidelity sound card and VOX functions for controlling the radio.The interface firmware supports variable VOX delay, CW and RTTY keying via audio (such as is available from Fldigi), and RTS and DTR control of any keying function, all via a single USB connection to the PC.

VARA HF is a soundcard modem that can be found on the HF bands exchanging traffic (Winlink). VARA implements an High Speed Data Mode and comes in 2 separate programs VARA FM and VARA HF. VARA is a High Performance HF modem based on OFDM modulation. VARA Modem, brings state of the art Military grade technology to new and existing HF data. Introduces a new standard of technology available for Amateur and Commercial use. Designed for operation within a SSB Bandwidth of 2400 Hz.

PSKmail, a narrow band ARQ system, allows ham radio operators to send emails and access internet data via short wave HF communication without specialized hardware—just a computer with a sound card. The system uses modes like PSK, MFSK, and THOR, adapting to changing channel conditions for efficient data transfer. Serving as an essential tool for remote or emergency communications, PSKmail can operate in environments lacking internet infrastructure, providing a reliable method of connection with a bandwidth of up to 500 Hz and a net throughput of around 2600 characters per minute. Initiated in 2005, PSKmail supports various platforms and integrates with Linux mail clients, contributing significantly to global amateur radio communications

This amateur radio website explains how to use the free AGWPE utility program to send and receive packet data using the sound card of your PC. Note that AGWPE is a Windows-only program. This website, which is hosted on SV2AGW's web site, focuses on support for the sound card packet features of AGWPE.

The article discusses running multiple instances of WSJT-X on a Windows PC, allowing users to manage and monitor multiple radios or data streams simultaneously. It explains how to set up additional WSJT-X instances, particularly for users with radios like the IC-9700, enabling monitoring of different bands or sub-bands. The setup process involves creating shortcuts, modifying properties to specify unique rig names, and ensuring the sound card supports dual-channel audio for simultaneous decoding. It also highlights potential issues related to processing power when running multiple instances and using several displays.

Sita is a small tool that permanently records an input of the sound card into the working memory and repeats the last 10 seconds if needed. This is ideal for connecting the radio to the Line In of the sound card and, if you have not understood something, to have the last 10 seconds repeated.

The QMX+ Transceiver Kit from QRP Labs is a high-performance, feature-packed 160-6m 5W transceiver designed for hams. This multi-mode kit includes embedded SDR, USB sound card, CAT control, synthesized VFO, RTC, and optional internal GPS. It can be used in CW, digital, and SSB modes, with standalone CW operation, digi mode via USB to PC, or SSB operation. The kit offers standalone beacon functionality and shares firmware with the QMX model. With an optional enclosure, battery-backed RTC, and GPS, the QMX+ is versatile and easy to build, making it ideal for ham radio operators looking for a customizable transceiver kit.

The Greencube Terminal Program enhances communication with the Greencube/IO-117 satellite by enabling message exchange via a PC's soundcard and integrating with multiple loggers like ACLog and Cloudlog. It supports new contact identification through an ADIF file, featuring a color-coded "Dupelist" for tracking unconfirmed contacts and grids. The software is compatible with voice notifications for efficient satellite communication management.

The ICOM IC-745 is a durable 1980s HF transceiver, ideal for enthusiasts who enjoy restoration. While lacking modern serial control, it supports digital modes with modifications like sound card connections and frequency stabilization. Enhancements like an RTL-SDR panadapter can also be added, making it a versatile and valuable radio for contemporary use.

MyWaveRecorder is a lightweight utility designed to capture and save any audio played on your computer. Whether it’s sounds generated by programs like CW_PLAYER, WX_PLAYER, MyWaveRecorder itself, your microphone, your sound card, or even streaming audio from the internet, this tool records them all with a single click.

How to record the full contest audio into .mp3 file(s). t is possible to record the receiver's audio through the USB sound card in the radio (USB Audio CODEC), but only the transmitted SSB audio can be recorded, unfortunately not the CW.