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Homebrew 20m CW transceiver by MINOWA, Makoto 7N3WVM

Introduction to NVIS advantages and disvantags.

Easy to use Audio Spectrum- and PSK31 decoding program specially designed for SWL's who don't need TX or for anyone who just like to monitor PSK31 or analyse signals. Adjustable DSP and Spectrum settings for audio and frequency spectrum analasys or to set it for best decoding of PSK31 signals. By ON6MU

A greyline map that automatically refreshes every five minutes DX.QSL.NET

An antenna system is more easily interfaced to a radio when the input reactance at the feedline terminals is low or close to series resonance

Flexnet and AGW packet engine tested and reviewed by IZ7ATH

Launching a balloon or kite supported tall vertical or protracted inverted L.

By 9H1EL, supports RSGB 21-28, BERU, IOTA contests, FOC marathon and IARU 50MHz trophy, Control of FT1000MP, all Kenwood and ICOM Radios which have CAT system.

LOGvrr, a **freeware logging software** developed by IN3VRR, provides amateur radio operators with essential tools for managing their contacts. The resource details various downloadable components, including the core LOGvrr application, an international callbook with approximately 1.8 million callsigns, and utility programs for installation and data conversion. It supports functionalities like logging QSOs, managing awards, and interfacing with PacketCluster systems, with specific instructions for installation on Windows operating systems, including compatibility notes for Windows 10 and 11 using Hyper-V or DOSBOX. The site also offers external tools and documentation, such as the FAQ_VRR.PDF manual which covers installation, printer configuration, ADIF conversion, and Packet setup. It references third-party software like Mercurio and BV QSL Management for QSL printing, and ADIF2QSL for label printing, highlighting LOGvrr's ability to export QSOs in **ADIF format** for integration with services like LoTW. The resource includes historical updates, with the latest core component update in August 2014, and notes on the CallBook's maintenance up to 2015.

Various radio related software, including some antenna analysis, and impedance calculators.

How to make easily your N-type connector, pictures and procedure, step by step

Shareware program to receive and transmit high speed CW (morse code) used in MS (amateur radio communication mode) with MS Windows 95/98 and sound card.

Edited by Oz6OM to find out who's on 50MHz expeditions anywhere around the world. Most recent news on the web.

Improved Helical Antenna Design for 802.11b WLAN by PA0HOO

Thermocouple ammeters are very rare these days, but the job they were perfect for - measuring antenna currents - is still a modern requirement especially in respect to groundplane currents. By David A. Reid PA3HBB G0BZF

A table with Loss in DB/100m , Max power in Watts, Diameter in mm , Velocity factor (VF) expecially in VHF UHF and Microwave

IC-746 radio control program in italian and personale info

LogDDM, a freeware logging application, supports the tracking of over **100** different awards, including _DXCC_, WAZ, and WAS, directly within its interface. This software facilitates comprehensive log management for amateur radio operators, integrating functionalities such as a built-in callbook lookup, real-time packet cluster access, and direct rig control for various transceivers. It also offers robust import and export capabilities, primarily utilizing the ADIF format, which is essential for submitting logs to award sponsors or transferring data between different logging platforms. Developed by Giorgio, IV3DDM, the program is designed to streamline the logging process, allowing hams to efficiently record contacts and manage their QSL information. It provides a centralized hub for operational data, from initial QSO entry to final award application. Key features include detailed QSL management, support for multiple operating modes, and a user-friendly interface, making it a practical tool for daily operating and contest logging.

Dutch society of collectors of old ex-military radio equipment and other nostalgic receivers and transmitters

how to easy and quickly unsolder and recover electronic components from old electronic board (SMD and not) by iz7ath Talino

VHF Optimized Yagi Antenna for the 6-meter band (50 Mhz) by ON6MU

These pages are entirely devoted to the Kenwood TS570 series Transceivers. Specifications & Brochure, Pictures, Schematics, Reviews, Manual and Modifications.

Our company provides quality QSL printing service for affordable prices.

Amateur Television (ATV) operations, particularly within the Arizona region, require dedicated resources for technical information, operational guidance, and community engagement. This club provides a focal point for hams interested in transmitting and receiving video signals on amateur bands. Members engage in local ATV repeaters, participate in technical discussions, and share knowledge on video modulation schemes, antenna designs, and station configurations. The club supports activities ranging from local simplex contacts to wider area repeater usage, fostering skill development in this specialized mode. The organization maintains a roster of club officers and offers membership opportunities to local amateurs. It also curates offsite links to other ATV resources, expanding the knowledge base available to its members and the broader amateur community. The club's emphasis on ATV helps propagate interest and technical expertise in a mode that combines traditional RF engineering with video technology.

A very compact receive antenna made with ferrite bars by PA0FBK

Easy to use CW Trainer for Linux. Adaptable for both the Koch and Farnsworth method of learning CW. Makes random tests or can read text from a file

A useful tool to make PCB

Geog is a suite of programs written by Andy Talbot ( G4JNT ), some of which make reference to a database of UK terrain heights, to provide useful information for radio amateurs

This article refers mainly to the old Cushcraft 1/4 wavelength AV series of antennas (12AVQ, 14AVQ etc) hence the references to radials. The R series (R5, R7 etc) are 1/2 wavelength antennas, and the radials are NOT 1/4 wavelength resonant.

3 Band vertical Marconi-antenna for the bands 40, 80, 160 meters with a ground net of wires as radials.

no tune SSB/CW transceiver for 1296, 2304, 5760 and 10368 MHz

6x2 coaxial remote antenna switch, completed unit showing weatherproof relay box and station control unit.

G3WZT design for a single stage bi-polar 100-150W Linear Power Amplifier for the 6M band.

Antennas and homebrew ancilliary equipment

EI5FK tower project

WY3A Homebrew G3TXQ Hex Beam for 5 bands

A 5/8 vertical groundplane antenna for 50 mhz

The Contesters Choice

Contest adjudication software scores Cabrillo logs. Auto evaluates up to 2000 logs with duping, claimed score, actual score, cross checking, N-QSO rule, 5-min delta QSO rule. Support including code changes, non-scoring logs troubleshoot and summary output requests.

Amateur radio club serving NEW YORK area. Club has fully equipped station,holds two hamfests a year,ve exam ,field day and contesting.

A micro processor interface that converts PC keyboard code into Morse code

The Thracian Rose Club has been created in the Roses' City Kazanlak (Bulgaria) in 1993. Its main goal is to promote contacts within the radio community members (HAM, CB and SWL).

World's largest collection of amateur radio and broadcast stations' QSL cards and awards

The TU2T DXpedition log provides a critical resource for verifying contacts made during the 2011 operation from _Ivory Coast_. This online tool allows operators to quickly confirm their QSOs, which is essential for QSLing and award applications. Users can typically search by callsign, date, or band to locate specific entries, ensuring accuracy for their personal logbooks. Such online logs are indispensable for DXers pursuing awards like **DXCC**, as they offer immediate confirmation of rare or distant contacts. The ability to verify a QSO without waiting for a physical QSL card significantly streamlines the award application process. This particular log facilitates the confirmation of contacts with the TU2T operation, a highly sought-after entity.

A schematic design of the W3DZZ antenna in portugues with description of trap building

144 Mhz portable 4 elements quand antenna by N1LO

Understanding high-frequency (HF) skywave propagation is crucial for amateur radio operators seeking to optimize long-distance communications. This resource details the fundamental principles of HF radio propagation, including the properties of electromagnetic waves, the characteristics of various HF bands, and distinct propagation modes such as skywave, ground wave, and line-of-sight. It places significant emphasis on the ionosphere's pivotal role in refracting HF waves, explaining how solar activity directly influences ionospheric conditions and, consequently, propagation paths. The resource integrates real-time monitoring capabilities, featuring dynamic charts and data from DX clusters, WSPRnet, and the Reverse Beacon Network, which allow users to track current band activity and propagation conditions globally. It also delves into advanced topics like Near Vertical Incidence Skywave (NVIS) and gray line propagation, providing insights into ionosonde data and various propagation prediction models. The site presents a detailed analysis of solar-terrestrial interactions, geomagnetic indices, and space weather phenomena, illustrating their direct impact on HF communication reliability. Practical tools and applications are highlighted, including real-time QSO planners, online Maximum Usable Frequency (MUF) maps, and alerts for solar flares or geomagnetic storms. The guide systematically breaks down complex concepts into accessible chapters, offering a structured approach to learning about ionospheric regions, diurnal and seasonal effects, and the interpretation of propagation indicators like foF2, MUF, and Lowest Usable Frequency (LUF). This makes it a robust reference for hams aiming to deepen their technical understanding and improve operational effectiveness.

Ham radio software downloads including sstv, logging and morse code

A mobile antenna for the 75 meters band by K0RWU