op sound

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op sound

77 links

Antennas : Stealth
  • HF Flagpole Antenna - 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
    [ Hits: 376 | Votes: 2 | Rating: 8 ]
Operating Modes : Digital Modes
  • Soundcard Levels for Digital Modes - 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.
    [ Hits: 279 | Votes: 0 | Rating: 0 ]
Operating Modes : Morse code : Learning Morse Code
  • A Visual Farnsworth On-Line CW Trainer - 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,
    [ Hits: 286 | Votes: 2 | Rating: 10 ]
  • 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 : 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 : Digital SSTV
  • JMSK - 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.
    [ Hits: 370 | Votes: 2 | Rating: 5.5 ]
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 : Propagation
  • Proppy Online HF Propagation Prediction - Proppy: Online HF propagation predictions using the ITU Recommendation P.533-13 Propagation Prediction Application.
    [ Hits: 2165 | Votes: 14 | Rating: 9.65 ]
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 : Audio
  • DIY Ham Radio Loudspeaker - 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.
    [ Hits: 518 | Votes: 0 | Rating: 0 ]
Technical Reference : HF Radios
  • Homebrew a High Performance SSB RTX for 14 MHz - 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.
    [ Hits: 345 | Votes: 5 | Rating: 7.8 ]
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 : Sound Card Radio Interfacing
  • USB Sound card review - Using external usb sound card devices for amateur radio digital modes operations
    [ Hits: 500 | Votes: 0 | Rating: 0 ]
  • Digital VOX Sound Card Interface - This interface is intended to be used with all the popular digital modes like PSK31, RTTY, Olivia, etc., which modulate a continuous carrier.
    [ Hits: 1265 | Votes: 1 | Rating: 1 ]
  • 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 ]
Technical Reference : TVI Filters

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