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Sounds from the 136 kHz band

A hombrew QRP transceiver for 40 meter band with many pictures, circuit and sound recording of some QSOs made with this Rig consisting of 5 transistor and one chip.

The Icom IC-7300 is a popular HF transceiver among amateur radio operators, known for its advanced features and ease of use. However, integrating it with software like Ham Radio Deluxe (HRD) can be challenging due to compatibility issues. This guide provides step-by-step instructions on how to configure the IC-7300 to work seamlessly with HRD 5.24, the last freeware version available. It covers the installation of necessary drivers, setting up virtual COM ports, and configuring audio settings for digital modes. To begin, users must download and install the Icom USB driver, which creates a virtual serial COM port for communication between the radio and the computer. The guide details how to check for this new port and adjust the CI-V address settings to ensure proper communication. It also explains how to set up the soundcard settings in HRD for digital modes, allowing operators to transmit and receive audio effectively. Following these instructions will enable IC-7300 owners to maximize their radio's capabilities with HRD.

Decibels: dB, dBA, dBC, dBV, dBm and dBi? What are they all? How are they related to loudness, to phons and to sones? This page describes and compares them all and gives sound file examples.

Sounds of the hf digital radio modes

Computer Control and Soundcard Interface for the Icom IC 706

One hundred and fifty words per minute (WPM) is a configurable speed setting in this online Morse code translator, which facilitates bidirectional conversion between plain text and **Continuous Wave (CW)**. Users can input text to generate corresponding Morse code, or enter Morse code using dots and dashes to receive a text translation. The tool supports various alphabets, including Latin, Cyrillic, Ukrainian, Hebrew, and Arabic, broadening its utility for international communication. The platform offers multiple output methods for the generated Morse code, including audible playback, visual flashing, and device vibration. Advanced configuration options allow for precise control over the sound's pitch (frequency), volume, and overall speed, including a **Farnsworth speed** setting. This flexibility enables users to customize the learning or communication experience to their specific needs. Additional features include the ability to save the generated Morse code audio as a WAV file and to create shareable links for messages, which can be sent with or without the accompanying text. The interface is entirely web-based, built with HTML5 and JavaScript, ensuring broad compatibility across modern browsers.

Yaesu FTDX3000 Sound card digital modes setup using internal USB interface

Accurate calibration of your receiver and sound card is necessary for good results with the weak signal modes in use at LF. Modern receivers with master oscillators that are synthesized to provide all conversion frequencies greatly simplify the process. This article describes a method of making the necessary measurements and adjustments to an ICOM R75 receiver and a sound card, using the ARGO software

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

MacOSX real-time precision signal / waveform generator. Uses native Mac sound Out capabilities.

MP3 and Wav files of some stations recorded on HF anc VHF bands by K9MU

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

MyHamPlace is a online amateur radio shop based in China dealer for Heilsound, Elecraft, MFJ, Yaesu , Kenwood and other popula ham radio brands

Topband and DX recordings and sound files on 160 meters band

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.

Microhams is a dynamic organization of hams in the Puget Sound area. The club includes a broad range of people from our local tech industry who participate in just about every aspect of our hobby.

On line shop in Greece for amateur radio products, electronics, DAB Radio and GPS. Dealer for popular amateur radio brands, heil sound, kenwood, MFJ and more

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

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

iSpectrum is a free spectrum analyzer for MacOS that allows you to display live audio in a standard frequency plot, waterfall display or in a stereo oscilloscope view. Used by ham radio operators, audiofiles, musicians, and Sound Technicians.

This wiki is intended to help identify radio signals through example sounds and waterfall images. Most signals are received and recorded using a software defined radio

PTT and souncard interface for the kenwood TM255 and TM455

Sonogram is a highly flexible audio spectrum analyzer for the analysis of sound, music and speech signals in the frequency-domain using different algorithms.

Audio Repeater is a windows application tha allows you to transfer, transmit, sounds from an input audio endpoint or device to an output one Playback. Audio transfer can be performed in any PCM audio format supported by Windows. KS version communicates directly with audio driver, bypassing all additional Windows audio processing

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

Audio setup at N2RIT built around the Yaesu FT-950 abd the Heil Sound PR-781 an ultraflex PRO EX3200

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.

An interesting article on how build an optimal sounding communications loudspeaker capable to optimize sound reproduction at the frequency range from 150 Hz to 3 kHz.

Telegraphy collection, telegraph, sounder, relay by F8JZR in french

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

The Superantennas MP-1 portable HF antenna is analyzed for its design and field performance, particularly its high-Q loading coil and 3/8-inch mounting. The review details the antenna's construction, including an 8-inch vertical section, a large-diameter loading coil tuned by a sleeve, and a 4-foot whip that disassembles into six rods for transport. Initial testing with the supplied 10-foot ribbon cable "ground plane" yielded poor SWR and RF hot conditions, indicating an inadequate ground system. Further experimentation with longer radials and resonant counterpoises for each band improved matching and eliminated RF hot issues, but introduced significant operational complexity. The author notes the difficulty in optimizing both counterpoise length and coil setting without an antenna analyzer, and the sensitivity of the MP-1 to counterpoise deployment. The review also discusses the recommendation to tune for maximum received signals rather than minimum SWR, often necessitating an external ATU due to the antenna's typical low impedance. The **MP-1**'s critical dependence on resonant counterpoises for effective operation, especially when elevated, is highlighted as a major drawback for portable use. The author ultimately sold the antenna, concluding that despite its sound technical design, its fussy nature and the need for extensive counterpoise management or an ATU detract from its portability and convenience compared to simpler, less expensive dipole solutions. The **Superantennas MP-1** is deemed a flawed portable antenna, requiring considerable effort to achieve its claimed performance.

Generating clean PSK signals and helping others to correctly tune their souncard output, as well as giving proper RSQ reports by identifying signal quality by N1NKM.

Demonstrates the _RoMac Automatic CW Identifier 2012_ software, a Windows application designed to automate station identification and provide a tuning pulser. It can send CW identification via a sound card's audio output or by keying a radio's manual CW jack using a serial port's DTR line. The software also supports CAT commands for various Kenwood, Yaesu, Flex, and Elecraft radios, enabling automatic mode and frequency changes for ID transmission. It integrates with USB audio-capable radios like the Icom 7300 and Yaesu FT-991, simplifying connectivity with a single USB cable. The application features a fully programmable interface, adjustable CW speed from **5 to 35 WPM**, and ID intervals from **5 to 30 minutes**. The integrated "Pulse Tuner" function allows for safe amplifier and antenna tuner adjustments by sending short audio tones or rapid CW keying, with an adjustable duty cycle from 1% to 100%. It offers compatibility with a wide range of transceivers and amplifiers, and a schematic for a basic sound card interface is included for users without existing setups.

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

Amadeus is a very powerful sound recorder and editor for Apple MacOS. Available in Lite and Pro version, is intuitive and a support many sound formats.

The CAT and audio interface version 3 project by PA5CA presents a comprehensive solution for integrating amateur radio transceivers with computer sound cards, facilitating digital mode operation and CAT control. It includes detailed schematics for the interface circuitry, illustrating the isolation transformers for audio paths and optocouplers for CAT data lines, ensuring robust electrical separation between radio and PC. The resource also provides PCB layouts, enabling constructors to fabricate their own boards for this specific design. The project outlines the component selection and assembly process, emphasizing the use of readily available parts to build a reliable interface. It addresses common challenges in sound card interfacing, such as ground loops and RF interference, through its isolated design. This construction guide offers practical insights into building a functional interface, making it suitable for hams interested in DIY radio accessories for digital modes like FT8, RTTY, and PSK31.

Interfacing the IC706MKIIG for Soundcard & TNC modes

AudioXplorer is a sound analyzer software designed for Mac OSX, provide a real-time analysis window where you can visualize the sound spectrum and sonogram

The course is for those not knowing a dit from a dah, first introducing the individual to learn code by sound and progresses in 12 lessons to 5 words per minute. Each lesson is about 30 minutes and recommendation is to listen to each twice before moving on to the next one.

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

UV-3R Review at G4ILO Blog with long textual review, pictures and some sound files

A sound file collection of QRP contacts by AE5X

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