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Projects and design atv de ik1hgi Progetti, circuits, master, fotos in Italian

This magnetic loop is 78cm diameter, with the smaller Hertz loop for tuning. Feeding is by gamma match.

Deciphering weak or noisy **CW** (Continuous Wave) signals often presents a challenge for amateur radio operators, particularly in contest environments or during DXpeditions. CWLab04X addresses this by providing a software solution that leverages **DSP** (Digital Signal Processing) capabilities of a soundcard to decode Morse code. It functions as both a receiver and a sender, supporting traditional CW and a unique "CCW" mode designed to enhance copyability of signals struggling against high noise floors. The program offers two installation methods: a Windows-specific installer for straightforward setup or a zipped package compatible with Windows and Linux systems running Wine. Users must first download and review the accompanying PDF documentation, CWLab04.pdf and CWLab04_Hardware.pdf, which detail the software's operation and the necessary soundcard interface circuit. The hardware PDF outlines a direct connection from the receiver audio output to the soundcard input, with optional conversion of the soundcard output for hard-keying or microphone input. CWLab04X is intended as an operational aid rather than a replacement for skilled human copy, particularly highlighting the effectiveness of its CCW mode in adverse signal conditions. The software was last revised in April 2009, with installation requiring the LV Runtime 602.

Yaesu FT-1000 review edited by G3CWI

Antenne Cadre Project by F5NGZ, description by F5TZA in french

Very compact and high efficiency antenna ,very low radiation angle even at low height.

Coaxial cables attenuation chart

Complete CW CODE signs

HF and VHF amplifiers homebrewed by GM3WOJ

Diagram and sample ferrite balaun for 1.8-30 MHz

This receive only loop covers a frequency range of about 5 MHz to 22 MHz and is built from readily available parts.

This vertical antenna consist of a 18 meters telescopic pole and allow operations from 160 to 30 meters band, project by Daniel Zimmerman N3OX

Cetina Front Panel Designer is a free software to design Front Panel and electronic device and equipment

This article describes a loop usable from 7 - 21 mHz, using half inch copper tube 3 feet in circumference

Who's who in ham radio

Plans and drawings of common amateur radio antennas, like jpoles, copper cactus, super jpole, omnidirectionals and quads

Free format input, User selectable usage of reports, counters for DXCCs, WWL, DOK/UK Counties/CQ/ITU/States/Provinces and more

This webpage describe how to set up the Signalink USB interface and Yaesu FT-857D for digital operations by NA4IT

This is a compact three transistor regenerative general coverage receiver with fixed feedback

G4PDQ's PacketCluster routines to make PacketCluster a little more interesting for the user and a little easier for the SysOp

Homebrew antenna insulators for DK7ZB yagi antennas

Planning and modelling Delta Loop antennas for all the ham radio HF bands include calculated wire lengths at each mid-band

Amplifier keying buffer for ICOM radios & others. Suitable for IC-746 IC-756 PRO and PROII. ACC1 key interface by KK5DR

FDLog, a Python-based freeware application, addresses the challenge of synchronized logging for multi-station Field Day operations. It facilitates real-time data sharing across a wireless network, enabling operators to monitor band status and active transmitters at a glance. The software's input system is optimized for minimal keystrokes, streamlining the logging process during intense contest periods. Key features include database synchronization over a wireless network, ensuring all connected computers maintain identical log data. FDLog also incorporates a time synchronization function, designed to keep client programs within a second of a designated master machine, mitigating issues previously encountered with NTP. This internal clock sync can be optionally disabled if not required by the operating setup. Developed initially on Windows 2000, FDLog has demonstrated compatibility with _Linux_ and _macOS_ environments, though some font rendering issues may occur on the latter. The program assists in preparing the ARRL Field Day entry form, simplifying the submission of contest results. User feedback and ARRL rule changes drive ongoing development, with a discussion list available for community support and input.

1 watt amplifier for 10 ghz made from surplus stuff

Two Versions of 5 elements stacked 25 Ohm Yagis with 1,80 m and 2,00 m Boom

Comprehensive astronomy / space / satellite-tracking package for Microsoft Windows 95/98/Me and Windows NT 4.0/2000/XP

Contains digimodes, antenna projects, DX info and lots more

This low power transmitter is developed for ARDF exercising purposes but of course can be used as super QRP transmitter either. With 1 or 2 meter wire as antenna and a ARDF receiver with ferrite-rod antenna the range is about 100m but with better antennas and a 'real' receiver the range is probably much larger.

Wire beam antenna for the bands 6m, 10m, 12m, 15m, 17m and 20m

Working priciple of OSJ and jpole anntennas by PY4ZBZ

Computes the Standing Wave Ratio, given the power readings on a line.

VU3NSH article on high current universal supply for rigs

EB4EQA's Projects GSM1800 moxon square antenna

Supports both PSK31 and PSK63, sends and receives color thumbnail portraits by PSK63, displays 24 PSK63 channels simultaneously, and features semi-automatic mode selection between PSK63 and PSK31. Merely left-click on a PSK63 signal to copy, or right-click on a PSK31 signal to copy.

Discussion on how properly drive and tune athe Ameritron AL-811 power amplifier

by Adam M. Farson VA7OJ/AB4OJ

A VHF power amplifier made with two cheap RF transistors, 2N3924 as driver and a BFS22A for final stage, giving an unexpected output power of 7-8 watts maximum

This is an Excel spreadsheet template to design DL6WU Yagi antennas

Homebrew Wifi antenna test page

A german documento on magnetic loop antennas

Complex CAD and Optimization Software for Waveguide, Coax, Combline and Antenna components design and antenna modelling

This article describes the 144MHz horizontally polarised antenna at VK1OD in November 2008. The antenna uses two identical four element arrays that were constructed around 1970

Linpac is an extensible Linux packet terminal that supports easy access to concurrent connections (streams), PBBS/FBB forwarding, and support for adding external commands

LZ2US offers 3 types amplifiers for the serious VHF/UHF amateur. These amplifiers are very robust and in use by contest groups and EME stations all over the world. Every amplifier is custom made.

A moxon antenna for 11 meter band, suitable for 27 Mhz and 28 Mhz

A MRF141G 3-175MHz Broadband Power Amplifier DL4MEA 02/1998

Versatile transmit interface circuit

New type of a Quad antenna, 6.4dBd gain

Club information, photos, utilities, links and repeater list. In Spanish