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modifications collected about Yaesu VX-150 by mods.dk

This resource details the computer-optimized design of the _ZS6BKW_ multiband dipole, an evolution of the classic _G5RV_ antenna. It begins by referencing the original 1958 RSGB Bulletin article by Louis Varney G5RV, explaining the operational principles of the G5RV's flat-top and open-wire feedline on 20m and 40m, noting its impedance transformation characteristics for valve amplifiers of that era. The article then transitions to the rationale for optimizing the design for contemporary solid-state transceivers requiring a 50 Ohm match. The core of the project involves using computer modeling to determine optimal lengths for the flat-top and matching section, aiming for a VSWR of less than 2:1 on multiple HF bands. It discusses the process of calculating feedpoint impedance based on antenna length and frequency, referencing professional literature from Professor R.W.P. King at Harvard University. The analysis also considers the characteristic impedance (Z(O)) of the open-wire line, identifying a broad peak of adequate values between 275 and 400 Ohms. Specific design parameters for the improved ZS6BKW are presented, including a shorter flat-top and a longer matching section compared to the original G5RV, with a velocity factor of 0.85 for the 300 Ohm tape. The article confirms acceptable matches on 7, 14, 18, 24, and 28 MHz bands when erected horizontally at 13m, and also discusses performance in an inverted-V configuration, noting frequency shifts. The author, Brian Austin ZS6BKW, emphasizes the antenna's suitability for modern 50 Ohm coaxial cable without a balun.

What do you do with a bunch of old computer power supplies?

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

Morse Keys by Gordon G4ZPY

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

Yaesu VX-6R mods

Solution to your OEM needs and can meet your design or vended antenna requirements for antennas from 400MHz to 10 GHz.

The DXrobot, operational since 1999, offers a free, non-commercial service primarily for the VHF ham radio community. It specializes in automatic real-time E-skip warnings for **144 MHz** in both Europe and North America, delivered via email or SMS. Additionally, the system provides automatic aurora alerts for _50, 70, and 144 MHz_ openings through the same notification methods. Beyond real-time alerts, the DXrobot facilitates the reception of the latest DX-cluster spots via email, a feature useful for operators without immediate WWW or cluster access. The service also displays recent E-skip and aurora spots detected by the DXrobot on 50, 70, and 144 MHz, with updates every five minutes. Historical data includes lists of all DX spots from the previous day on 50, 70, and 144 MHz, updated daily. Key propagation data, such as MUF timeline, Solar X-rays, Geomagnetic Field, and Estimated Kp index, are also presented.

Great pages about KB1SG rhombic antennas collected by EI8IC.

F5RDH project of a transverter, that can receive input in HF and convert output to 144 Mhz in french

A useful tool to make PCB

Free VHF/UHF/Microwave contest logging software for rovers and non-rovers - Runs under Linux, Windows, etc.

LogView is a free post-contest log-visualisation tool, for analysing contest performance. It plots the QSOs in a Cabrillo-format contest-log on to one of 8 different maps by finding the position of each QSO from an online database of about 970,000 W/VE callsigns.

Quick reference table on understanding A K SFI indexes and how can be translated in usable frequency opportunities

Display solar activity forecast for next 27 days, display A-index, Sunspot Numbers and Flux forecast including graphs for solar activity and geomagnetic forecast. All forecasts are updated daily.

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.

An external keypad for FT-817(ND), for the serious portable/field-day contester/operator. Homebrew it with the free firmware and public circuit diagram. The circuit is very simple and takes power supply from the ACC port of the radio

Mods for the yaesu FT-950

Win-EQF provides a comprehensive logging solution for amateur radio operators, integrating station control and DX resource management within a single application. It supports various operating modes and offers features for efficient logbook management, essential for contesters and DXers alike. The software is designed to streamline the process of recording contacts and managing station operations, which is crucial for achieving awards like **DXCC** or **WAZ**. Operators can utilize Win-EQF to maintain detailed records of their QSOs, track award progress, and interface with other station hardware. Its robust logging capabilities ensure accurate data capture for every contact, from basic information to specific contest exchanges. The program also facilitates the use of external DX resources, helping operators identify and pursue rare DX entities. This tool is particularly useful for those seeking to optimize their station workflow and enhance their overall operating experience.

yaesu radios community talk, impressions and comments about yaesu vx7r

A 10 Bands mobile antenna for about the price of 2 mobile monobanders.

RemAud is a Voice over IP (VoIP) application primarily designed for two-way amateur radio remote control over the Internet. RemAud uses streaming-audio technology in a client-server architecture. It features high radio sound quality, low latency, low bandwidth and very low CPU usage by DF3CB

DF3CB site, contesting, and software BV is a professional freeware software for the QSL Management and Label/QSL Printing under Windows developed and distributed by Bernd Koch, DF3CB, since 1989. It is mainly designed for the contester and QSL manager with high QSL quantities but useful for all other QSL'ing purposes as well. Includes logging features

Amateur Radio Maps online mixer of different selectable layers, including DXCC references, IOTA references, ITU and WAZ Zones. Works with most web browsers make heavy javascript usage.

HFCC manages and co-ordinates global databases of international shortwave broadcasting in keeping with International Radio Regulations of the ITU. Operational Schedule, available for free download and iteractive schedule

Interactive CW Keyer the best for DXers

Are you experiencing very high SWR with the 10M Modification to Ameritron AL-811 amplifier ? This is a good forum topic to fix this problem.

More links to Icom IC-746 resources on the web

UJYSAT is a new software for satellite tracking written by IT9UJY, This software is totally free for Amteur Radio only.

About dummy loads, what are they and how to build one

A Bulgarian bazooka antenna project by LZ2ZK

This article describes a low-cost vector network analyzer that operates from 200 kHz to 100 MHz, and connects to a personal computer using a USB 1.1 interface By Tom McDermott, N5EG, and Karl Ireland

A Grounding Q&A by ARRL web

Online log for 5V7TT Togo dxpedition 2010. Offer QSL request service.

The page provides a utility to record QSOs for amateur radio operators, allowing them to send the recorded signal back to the other station. It addresses challenges with VOX capability in radios and offers solutions for different radio models.

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

This is an Excel spreadsheet template to design DL6WU Yagi antennas

Homebrew Wifi antenna test page

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

CWRX, a freeware Windows application, decodes Morse code (CW) signals directly from a sound card's audio input, presenting the decoded text on screen. It supports various receive bandwidths and filtering options, allowing operators to optimize signal reception in different QRM conditions. The program's core functionality focuses on robust CW decoding algorithms, crucial for weak signal work and contesting environments. Developed by OZ1IVA, Lars Harbo, this utility provides a straightforward interface for real-time CW interpretation. It integrates basic logging capabilities, enabling users to record decoded transmissions for later review or contest submission. The software is specifically tailored for the Windows operating system, ensuring compatibility with common shack computer setups. Its design emphasizes ease of use for amateur radio operators seeking a dedicated CW decoding solution. The program's small footprint and direct functionality make it a practical tool for both casual listening and more intensive operating sessions, without requiring extensive system resources.

METEOR v 4.0 DOS and COLORGRAMME Specialized software in the detection and registration of echoes radio products by meteors shower (falling star) at the time of their gone in atmospheric

Detailed review of all the Hell software currently available for the PC

Tuning the Solarcon Antron A-99 antenna for 20 meters band

A freware book on learning morse-code. The Art & Skill of Radio-Telegraphy Third Revised Edition by William G. Pierpont N0HFF, online version available in multiple languages

Yaesu FT-100 radio control software for linux

Info about Yaesu VX-8R by APRS Wiki

SignalGen is a free (GPL) Linux (Xwindows GUI-based) utility that generates relatively low frequency signals with the use of a PC sound card. It is an entirely suitable replacement for a hardware signal generator if one doesn't require signals of a frequency higher than about 50 KHz. SignalGen creates any frequency between a fraction of one Hertz and an upper limit determined by your sound card's capabilities.

80M field expedient antenna, suitable for NVIS operations

Topic regarding a new 1KW HF power amplifier with 2x GI7B