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These are QRP rated 3 Pole Butterworth filters based on a design by K4VX, feature simplicity, almost no insertion loss, and reasonable rejection on the other ham bands.

A browser based circuit simulator offering a large set of functionalities allowing to share and discuss designs

The Hermes-Lite is a low-cost direct down/up conversion software defined amateur radio HF transceiver based on a broadband modem chip and the Hermes SDR project. It is entirely open source and open hardware, including the tools used for design and fabrication files. Over 300 Hermes-Lite 2.0 units have been successfully built.

Hamnet IP-Database mapping system mostly european based.

An interactive map for sota operations. SOTA Activators and cheasers will find this summits mapping site very useful resource. Based on Google maps.

The Jackson Hole Area Amateur Radio Club is based in Jackson Hole, Wyoming. The Club has members throughout Jackson Hole and includes ham radio operators in the Star Valley areas of Wyoming and the Teton Valley in Idaho.

This calculator calculates the length and width of a patch antenna based on the frequency, dielectric constant of the dielectric and the height of the thickness of the patch antenna substrate.

A 144MHz FM class C RF Power Amplifier based on a 2N6084 RF transistor, that can produce 50w output max

FRARS is a local ham radio club based in Poole, Dorset and has members active on all bands from 73KHz to Light!

Amateur projects to investigate radiowave propagation - G3PLX's chirp project, ionosonde database, and more

Atlantic Tower offer site maintenance, repair, modification, upgrade and installation services based in Orlando FL

This processor controlled autoranging sniffer has become popular for vehicle based foxhunting in Australia

Yaesu VX-8DR/DE received APRS beacons map based on Google Maps. The application parses Chirp's .img files and shows the QTH of the incoming APRS messages.

SJ2W Contest Station, antenna for the 160 meter is a 39m vertical. This 160m antenna consist of 29m of WIBE tower sections with an insulated base and 10m top tube.

EasyEDA - Web-Based EDA, schematic capture, spice circuit simulation and PCB layout Online.

This LPDA calculator is based on the design procedure as described by L. B. Cebik, W4RNL (SK) in the 21st edition of The ARRL Antenna Handbook.

For UK resident amateur radio operators. Sell unwanted Ham gear for free

DX Club based in portugal

Hardsoft products home page: telefonia, telecommunications, radio, computers, base

Yaesu Certified European Distributor and Authorized Service Center based in Italy

Manufacturers of professional Civil & Defense UHF/VHF Base Sation Antennas,Installation Hardware, Power Splitters and Distributors of EUPEN rf Cable & Connector products.

New York City Amateur Radio Emergency Communications Service (NYC-ARECS) is a NYC based auxiliary communications service. The organization is made up of amateur radio operators who are trained and dedicated to providing radio communications for governments, civil-preparedness and relief agencies during periods of local, regional, or national civil emergencies. This may include situations such as power failures, explosions, fires, floods, earthquakes or terrorist activities. NYC-ARECS is a participant in the NYC Office of Emergency Management (OEM) Partners in Preparedness program and a member of DHS FEMA's National Preparedness Coalition.

Portable chargers based on solar panel cells

By using HamRacer, a windows based voice keyer, also dumb radioamateurs can take part to SSB contests. The unique synthesized PC-based voice keyer for HF and VHF SSB contests. In this video you can assist a real contest with recorded QSO with: SP6OWA, S57O, OK1IEI, 9A1DL, OE1PAB, OK1GTH, 9A1E.

The Club Radio Amateur de Québec (CRAQ) is a prominent amateur radio club based in Québec, Canada, dedicated to fostering interest and participation in amateur radio. It provides a platform for local hams to connect, share knowledge, and engage in various radio-related activities, including **DXing**, contesting, and technical experimentation. The club supports its members through regular meetings, technical presentations, and organized operating events, aiming to enhance their skills and enjoyment of the hobby. CRAQ also plays a role in public service communications, often collaborating with local authorities for emergency preparedness and response. CRAQ's activities include operating club stations, organizing **field day** events, and offering training sessions for new licensees. Members frequently participate in provincial and national contests, contributing to the club's competitive standing. The club maintains a network of repeaters, providing reliable local communication infrastructure for its members and the broader amateur radio community in the Québec area. These resources facilitate daily QSO traffic and serve as critical links during community service operations.

An Arduino based remote monitoring system. The Remotino is a remote monitoring system based upon two Arduino Nano units RemotinoSampler and RemotinoViewer that are connected

A J-pole antenna plan for 50 MHz based on the DK7ZB design

N4KGL review of the Elecraft KX3 transceiver based on first experiences in portable operations.

Quality Tower is dedicated to performance as a manufacturing and installiation leader by delivering high quality services in a timeframe that will meet and exceed based in Florida

Havering and district Amateur radio club based in Hornchurch, Essex

Diamond Antenna CP22E VHF base station antenna review. This antenna has a remarkable design achieving 5 dBi directivity in a slim low-profile design.

Based in Huntsville AL

Loki5ace version 5.3.39.1 is a freeware amateur radio logging program designed for Windows operating systems (XP, Vista, 7) and compatible with Linux Wine. The software offers multiple installation methods, including a portable version (loc5portable.zip or Loce5pack.zip) that does not require administrator rights or Windows Registry modifications, making it suitable for USB stick deployment or limited user accounts. An official installation (loc5acest.zip) is also available, typically installing to C:\Program Files\Hamlok\LokiAce\ and requiring administrator privileges for initial setup and updates, with user-specific settings and database files stored in application data folders. The program's database, Loc4ac.mdb, can be renamed to the user's callsign for personalization. Loki5ace supports context-sensitive help, which requires WinHlp32.exe installation on Windows Vista and 7. The software includes features such as special print functions, Telnet Watch with comment display, and an 'Own QTH' field for location management. Updates can be performed via an in-program function or by manually copying the Loki5ace.zip file, which contains the main executable, Loki5ace.exe, to the program folder. The latest version 5.3.39.0 includes repairs for special prints and enhancements to the Telnet Watch feature.

An external base for this nifty little paddle by Elecraft

PalmVE is a program for Palm based handheld computers that is built to aid as a virtual volunteer examiner for amateur radio written tests

Based in Agawam, MA USA

The richardson wireless klub is an arrl special service club of amateur radio operators based in richardson, tx, usa.

A simple DIY signal generator based on NorCal QRP club kit

Amateur radio Quad Antennas manufacturer based in Italy produce HF and VHF Quad antennas, and spare parts.

Aerial 51 is an antenna manufacturer producing HF Wire antennas. Their antenna product catalog includes portable, OCF wire antennas for HF bands but also QRP transceivers, and accessories for portable operations.Based in Germany

Sound card based multimeter

A shortwave radio listeners log book runs on Windows and MacOS Catalina and above. The KB6IBB SWL Logger is a program designed for the shortwave radio listener. It offers shortwave specific logging of stations, with most tasks handled automatically. The program also incorporates the use of EiBi shortwave database for logging and looking up various known shortwave stations world wide.

The Richardson Wireless Klub is an ARRL Special Service club of amateur radio operators based in Richardson, TX, USA.

The Oliver Amateur Radio Club Is a non profit B.C. Registered Society based in Oliver, B.C. in the South Okanagan region of British Columbia, Canada. The club is for Amateur Radio Operators & Enthusiasts and also provides Emergency Communications in the Regional District of Okanagan South.

Radio DX club based in sweden

A free repeater database app for iPhone and iPad includes repeaters from 35 different countries and is available in 5 languages

DMR Contact Manager is a Free software package designed to make it easy to maintain channel, zone, contact and call group information in these radios. It is fully compatible with the Ham-Digital and RadioID database systems and allows instant codeplug updates from a wide variety of sources. DMR Contact Manager is designed for use with Connect Systems CS700/CS701/CS750/CS800/CS801/CS800D radios, as well as the Tytera MD-380/390/390GPS, TYT MD2017/MD9600, AnyTone AT-D868UV and AT-D858, Retevis RT3, and similar radios that use the RDT/RDB file formats.

Amateur radio antenna maker with online shop based in Brazil

Free ads for UK Hams

Records based on OZ2DXC Copenhagen DXcluster QSL and MGR databases.