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Ham Radio online store dealer for Yaesu Kenwood Icom LDG Microham and many more ham radio related brands, based in Holland

Specialists in (second hand/used) HF Radio & Antenna Sales, Service, Repair, Spare parts of Codan / Barrett / Qmac SSB equipment, and a licenced dealer for new sales of Barrett Communications Radio & Antenna Systems based in Australia

50 MHZ Moxon antenna based on the KG4JJH design with some slight modifications in the construction

An interesting project about an Arduino-based frequency counter fot the Kenwood TS-520S

Picture and specifications

Based on original G2BCX design this J-Pole antenna for the six meter band is made with a homemade ribbon cable. The antenna shown in this article includes a coaxial cable choke feed to remove RF currents from flowing on the outer of the cable.

This web based application will compute circuit values required for an L-C circuit to resonate at given frequency. Also it will compute the resonant frequency if given values for L and C.

United States and Canadian call sign/scanner frequency databases, Worldwide airport frequencies, FIPS codes, Mass Media searches for DXing and more!

Grig is a simple Ham Radio control (CAT) program based on the Ham Radio Control Libraries (Hamlib). It is intended to be highly generic presenting the user to the same graphical user interface regardless of which radio is being controlled.

Expert Electronics LLC is a manufacturer of modern and compact SDR transceivers. EE develops and produces modern radio-electronic devices based on SDR (Software Defined Radio) for radioamateurs and professional applications. Makers of popular SunSDR models and SunSDR-MB1 transceivers

British based CW club, originally founded in 1938

A freeware apple Macintosh-based program that helps amateur radio contesters by converting a log from a radio contest into the Cabrillo file format which may be submitted to the contest sponsor.

Shortwave schedules around the world with frequencies in kHz and distance calculator. This web site is an online searchable database of current broadcasting stations. You can search for stations on the air now or for scheduled transmisssion periods and frequencies.

Fox hunting site with details of a PC based DF system

Big picture and detailed feature of the yaesu VR-5000 receiver

An Arduino APRS project based on the real time OS BeRTOS

Meimaris Communication Equipment based in Greece

The Russian Internet Callbook, hosted at krasnodar.online.ru, offers a specialized lookup service for amateur radio callsigns within the Russian Federation. This online tool is designed to assist DXers and contesters in identifying contact information for Russian stations. The resource functions as a digital callbook, allowing users to search for specific callsigns and retrieve associated data, which is crucial for QSLing and verifying contacts. While the concept is to provide a comprehensive database for Russian amateur radio operators, the current status indicates a configuration issue, as the domain krasnodar.online.ru points to the server but the site itself is not configured. This suggests the service may be inactive or undergoing maintenance, impacting its utility for callsign lookups. The original intent was to serve as a key _DX resource_ for the region.

The circuit is based on two AD8307 log amplifiers, which are connected to the forward and reflected ports on a directional coupler

Win92 - Windows-based data management for the Pro-92/2067 trunking scanner

Over 47 full-screen maps are available within _NAOMI_ (North American Overlay Mapper), a free Windows program designed for US and Canadian amateur radio enthusiasts. This mapping suite includes 9 backgrounds such as CQ Zones, ITU Zones, and ARRL Sections, along with 16 foreground layers like Counties, Areacodes, and Grid Locators. Users can calculate distances and bearings, track real-time mouse positions with continuous Grid-Locator data, and integrate with APRS for live station tracking via the FindU database. For a global perspective, the _Global Overlay Mapper_ (GOM) provides a world map, 8 continental maps, and 29 sub-continental maps, all with 12 active layers including Country Outlines, CQ/ITU Zones, and Prefix information. Both NAOMI and GOM offer feature-locate systems to jump to positions based on prefixes, capital cities, or Grid Locators, and provide customized beam headings and distance displays. The site also features _LogView_, a post-contest log visualization tool that analyzes Cabrillo-format logs by plotting QSOs on maps, supporting over 30 major contests like CQWW and ARRL DX, and allowing comparison with published results.

Double Bazooka Antenna, a simple coax based and broad band antenna you can easily build

Statistics based on FCC Database. Data is compared to previous perions.

The Clearwater Amateur Radio Society is an active amateur radio club based in Pinellas County Florida.

Ham radio map database with search and logging functions. Currently in german only, run under Windows.

An home made QRM Eliminator project based on the WA1ION original design, used to remove QRN generated locally by an halogen lamp in Dutch

On-Line CB Radio and truck accessory shop based in UK

Amateur radio operators frequently seek efficient methods for logging contacts, particularly during contests or DXing sessions where speed and accuracy are paramount. MiniLogBook addresses this need by providing a streamlined logging utility designed for Windows environments. The software facilitates rapid entry of QSO data, offering an automated lookup feature for previous contacts based on recent callsigns, which significantly reduces redundant data entry. The application's distinctive utility lies in its integration capabilities with other ham radio software, specifically _MRP40_. Users can select text within the MRP40 receive window and, with a double-click, automatically insert that text into MiniLogBook. This feature is particularly advantageous for operators engaged in digital modes like RTTY or PSK, where copying callsigns and exchange information accurately and quickly is critical. The tool aims to simplify the logging workflow, allowing operators to focus more on the contact itself rather than manual data transcription. While primarily a logging tool, its focus on quick entry and interoperability with specific third-party software distinguishes it from more feature-rich logging suites. The software is distributed as freeware by _Polar Electric_, making it accessible without cost. Its small footprint and direct functionality cater to operators who prefer a minimalist approach to logging, prioritizing efficiency over extensive database management or advanced reporting features.

A shortened 160 meters band antenna for hams who do not have 260 ft of space, based on a open-wire-fed short dipoole

URLog, version 0.1.10, functions as a freeware amateur radio logging application designed for basic QSO record-keeping. The software provides core functionalities for inputting contact details, including callsign, date, time, frequency, and mode, which are fundamental for maintaining an amateur radio logbook. Its design emphasizes ease of use, making it accessible for operators who require straightforward logging capabilities without extensive advanced features. The application's utility lies in its simplicity for everyday logging tasks, particularly for those who prefer a local software solution over web-based loggers. While specific data formats supported are not detailed, standard logging practices suggest ADIF compatibility for export, facilitating integration with other ham radio software or online logbooks. The software's compact download size of approximately 4.5 MB indicates a lean installation, minimizing system resource usage.

RigPix Database picture of the TS-850

The document provides a comprehensive overview of baluns, which are devices used to connect balanced loads, like dipole antennas, to unbalanced inputs, such as coaxial cables. It covers various types of baluns, including voltage and current baluns, and their design, construction, and testing. The text discusses the importance of baluns in preventing RF currents on coax shields and their applications in Ham radio setups. It also includes practical advice on selecting and using baluns based on antenna impedance and power ratings, along with detailed performance evaluations and construction tips for different balun configurations.

DX-Fighter is a ham radio program for DX cluster spot reception. Connect to any DX cluster server and Telnet server. DX Fighter is the first program to receive the DX Cluster with an embedded web browser that allows browsing on any website also integrates the functions of research on search engines or databases such as QRZ.com.

YF1AR multiband vertical antenna, based on orginal concept by VE7BS. Consist of 6 vertical elements and 6 base radials with a single 50 Ohm feed line.

Morse Machine is a tool for learning to read Morse at a good speed, based on the Koch Method

This is an incredibly simple and cheap frequency counter with binary readout, based on the ideas of Onno PA2OHH.

Over 1.5 million US amateur radio call signs are managed by the FCC, and this online service assists operators in finding available vanity call signs. Users can specify desired **call sign suffixes** to narrow down search results, which are drawn directly from the current FCC database. The platform clarifies that some valid call signs, never previously held since online FCC record-keeping began, may not appear in search results; for such cases, a separate "call lookup" function is recommended to verify availability before applying. The service provides crucial guidance on the application process, noting that applications should generally not be filed before the indicated "Available Date" unless the applicant is a former holder or a close family member. It also dispels the common misconception that call signs are granted on a first-come, first-served basis on any given day. Instead, all applications received on a particular day are metaphorically "thrown into a hat," with a winner randomly selected. This mechanism ensures fairness in the assignment of highly sought-after **vanity call signs** across the US amateur radio community.

RTL-SDR is a very cheap software defined radio that uses a DVB-T TV tuner dongle based on the RTL2832U chipset. This is a blog about rtl-sdr, software defined radio and their developments and applications.

A trapped dipole antenna based on the orignal W3DZZ antenna design resonating on 80 40 20 15 10 meters

Online ham radio practice exam by eHam, allow practice current exams but also old amateur radio exams based on old licence classes.

A 40/80 meters dipole made with two loading coils based on a project by IK1ZOY

This homemade tube oscilloscope is based on the WaterMan Pocket-Scope 0510A, a 3 tube oscilloscope made in 1946.

Picture and specifications of the Yaesu FT-847

APRSmap is a new APRS client software by OE5DXL, which is based on the OSM map source. It allows a lot of features in only one program by a good usability. NO installation is required, just put it on a disk an run it

A project for a simple RTTY decoder based on Arduino UNO R3. Includes the RTTY modem source code available for download along to schematics pictures and references.

Homebrew a compact yagi antenna for 14 Mhz suitable for those with small plots based on a design by AB4GX

Yaesu FT-950 with a large picture at RigPix

Operating in the Nordic region often requires specific call sign lookup tools, and this resource offers a dedicated search service for Swedish amateur radio operators. Users can query the database by entering a call sign, a family name, or a city, facilitating the identification of hams within Sweden. This functionality is particularly useful for DXers attempting to confirm contacts or for local hams seeking to connect with others in their area, leveraging the official data provided by the Swedish Amateur Radio Society (_SSA_). Such a lookup service streamlines the process of verifying contacts for awards like _DXCC_ or for general QSLing purposes. While many global callbooks exist, a national service like this often provides more granular and up-to-date information for its specific region. The ability to search by city can be especially beneficial for local rag-chewing or for coordinating activities within a specific geographic area, offering a practical complement to broader international databases.

The Olivia transmission system is constructed of two layers: the lower, modulation layer is an (almost) classical Multi-Frequency Shift Keying (MFSK) and the higher layer is a Forward Error-Correcting (FEC) code based on Walsh functions.

The utility "NEC-2 for MMANA" is intended for calculation of antenna models made and optimized in program MMANA and for construction and simulation of antenna models using input language NEC-2 and based on MMANA models.