Search results

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.

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

Some modifications for the Tigertronics Signalink USB sound card radio interface

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.

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

Amateur radio sound recordings by G3NPF

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

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.

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

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.

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

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

A sound file collection of QRP contacts by AE5X

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

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

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

How adjust DSP settings for your trasmitter when using Heil Sound microphones

Tom, K1JJ on radial ground system applied to 160 m vertical array

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.

WB8NUT digital modes information page with various digital modes description and sound samples

Always wanted to know what kind of sounds we hear, when listening to the radio? Here are some examples

Sound card based multimeter

If you have been hearing something that sounds like music on the HF bands laterly, it may not be your imagination, QST Article by WB8IMY at ZS6WR web site

Windows free sound recorder. What you save is what you hear ! Small utility program to capture and save any sound played by your computer. Audio recorded can be converted in MP3 format.

EDC is an amateur radio dealer for Heil Sound, Elecraft, Vibroplex and Force 12 antennas in Japan

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

Living in a no antenna deed restricted community sounds bad for a HAM, but it means you just need to be more creative. I have found this will not stop your DXCC activities and many of my local HAM club members will agree

Italian ham radio dealer for major brands like Icom Kenwood Yaesu HY-GAIN Heil Sound Rigexpert Palstar GAP antennas Diamond SteppIR and others

This article describes the construction of a high performance transmitter and receiver for SSB (voice) communication covering the 14MHz (20 meters) high frequency amateur radio band with output range 15 to 20 watts and a top audio sound quality both on transmit and receive.

In this page you will find soundtracks from various space objects including satellites, manned and unmanned space ships and space stations.

Sound recordings of meteors and things reflecting TV station video carriers , frequencies used are analog TV video carrier frequencies offset by 1 kHz SSB

Amateur radio daler for Cushcraft Heil Sound, Hustler Kenwood Yaesu SGC amateur radio products in South Africa

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

Vox recorder is activated by voice and sounds exceeding a threshold. It saves for every record a .caf file that you can play, delete or send by email. Useful for surveillance records, hamradio scanners, and many many other applications. You'll be surprised to hear what happens in an all night using Vox recorder.

Sound clips and notes on sporadic E on four meter band

This trainer is a small personal project designed to play with learning morse code through the Farnsworth method. The main difference between this trainer and others is that I am experimenting with visual reinforcement by displaying the character currently being sent. It is my hope that this will help form a stronger link between the sound of CW and the meaning of the sound. This page should work in any modern desktop or mobile browser,

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

Amateur Radio Store, dealer for DXZkit products, Heil Sound, Arrow, Miracle based in Northern Colorado

An Android based CW practice program based on simulated QSOs. The app will generate Morse code sounds from 5-50 words per minute.

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

This page contains links to a variety of data signals that have been specially recorded. Each file contains a standard test message (the quick brown fox jumped over the lazy dog) repeated twice. The files can help you learn the characteristic sound of various data modes but they can also be used to make sure your decoder is working.

The vOICe Learning Edition can be used in combination with a regular oscilloscope, allowing blind users to hear any oscilloscope trace.

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

The Western Washington Amateur Television Society (WWATS) is a group of amateur radio operators in the Puget Sound area with a common interest in amateur television

Pictures of the Heil Sound PR-781 studio microphone by K2COW