sound

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sound

277 links - and 3 categories

Internet and Radio : Sounds
  • 50MHz Sound Archive - This page contains some sound clips of DX on 6m.
    [ Hits: 58 | Votes: 0 | Rating: 0 ]
Operating Aids : Time
  • GPS clock - This project taps into the NMEA stream and provides both a visual display with an LCD and also LED indicators and a sounder. The LCD outputs include 3D Lock, 2D Lock and NO Lock while the UTC time is also displayed to screen.
    [ Hits: 148 | Votes: 0 | Rating: 0 ]
Operating Modes : Morse code : Learning Morse Code
  • Recognition of CW signs at different listening levels and frequencies - The recognition of telegraphy masked by noise at 40 and 80 signs/min telegraphy speed was studied in 10 normal-hearing subjects at different sound pressure levels (25-85 dB SPL in steps of 5 dB) as well as at different test frequencies (2000, 1000, 800, 630, 500 and 250 Hz). The ability to recognize the signs varied with varying SPL. Recognition for most of the subjects was best at an SPL close to 70 dB. All subjects improved their recognition as the frequency was lowered to 500 Hz, some even at 250 Hz. These facts should be taken into consideration when training telegraphy operators as well as in the construction of radio receivers to permit listening at low frequencies. Furthermore, the critical ratio was calculated at the different test frequencies.
    [ Hits: 81 | Votes: 1 | Rating: 7 ]
Operating Modes : Packet Radio : Beginner's Guide
  • Sound Card Packet - 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.
    [ Hits: 90 | Votes: 1 | Rating: 8 ]
Operating Modes : Robust Packet
  • Robust PACKET at SigIDWiki - Definition of the Robust Packet digital mode with sample sounds and description of main features. Includes references to software used to operate in this mode and frequencies to be used.
    [ Hits: 80 | Votes: 0 | Rating: 0 ]
Propagation : Resources Software : Audio Recorders
  • Sita audio recorder - 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.
    [ Hits: 84 | Votes: 1 | Rating: 10 ]
Software : Packet
  • Soundmodem UZ7HO - 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
    [ Hits: 597 | Votes: 1 | Rating: 1 ]
Software : Virtual Audio Software
  • Audio Repeater - 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
    [ Hits: 502 | Votes: 1 | Rating: 10 ]
Software : Weak Signal
  • VARA - 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.
    [ Hits: 103 | Votes: 1 | Rating: 10 ]
Technical Reference : Homebrew
  • PCM Kestrel HF Transceiver - This article describes an upgrade to the Kestrel transceiver, replacing its LCD display with a 0.91-inch OLED screen for improved sound quality. VFO boards from Denys VK3ZYZ were integrated, particularly a Nano VFO board. The author shares details about the setup and the resulting enhancements, along with images of the modified components. The transceiver is now optimized for various frequencies and operates at a power output of approximately 120 W pep. More information about the boards can be found on the provided website.
    [ Hits: 65 | Votes: 0 | Rating: 0 ]
Technical Reference : Morse Code Oscillator
  • Morse Code Practice Oscillator - This project builds into a box into which you plug a Morse Code Key. Using the Morse Key creates realistic sounds so you can judge how well you Send. A great tool for beginners to improve Morse sending skills before going on-air
    [ Hits: 62 | Votes: 0 | Rating: 0 ]
Technical Reference : Sound Card Radio Interfacing
  • Isolated PTT and CW Key interface - 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
    [ Hits: 155 | Votes: 0 | Rating: 0 ]
  • Soundcard Interfacing - 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
    [ Hits: 189 | Votes: 0 | Rating: 0 ]
  • AnyRig A Flexible Digital Mode Interface - 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.
    [ Hits: 140 | Votes: 0 | Rating: 0 ]
Technical Reference : Test Equipment : Signal Generator
  • Two Tone Generator - A two tone generator is an essential test gear made with just four transistors that helps you evaluate your amplifiers, mixers, receivers for distortion. Distortion makes all the difference between a pleasant receiver and a horrible sounding one, between a clean transmitter and bad, splattering one on air.
    [ Hits: 81 | Votes: 0 | Rating: 0 ]
Technical Reference : Vector Network Analyzer
  • Repairing HP 8753C VNA - A true detective story about a interesting repair project, putting back to life a malfunctioning HP 8753C VNA that was rebooting after startup with noise and clicking sounds produced by the attenuator and switch relays.
    [ Hits: 94 | Votes: 0 | Rating: 0 ]

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