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Representing the interests of Amateur Radio in Berkshire & the Thames Valley since 1934

Personal page of the Dutch Amateur Radio Station PA1CW

Saltash & District Amateur Radio Club

Explains the fundamental purpose of a repeater, detailing how these automated relay stations overcome distance and terrain limitations for VHF/UHF communications. It traces the historical development from early Bell Telephone Labs "relay" stations in 1922 to Art Gentry, W6MEP's, pioneering K6MYK amateur radio repeater in the mid-1950s, which remains active today. The resource clarifies the distinction between simplex and duplex operation, including the unique function of a "parrot repeater" for single-frequency recording and playback. Delving into the internal workings, the guide breaks down a repeater into its core components: the antenna system, feedline (often _Heliax_ or hardline for minimal loss), duplexer, receiver, transmitter, and controller. It emphasizes the critical role of the duplexer in preventing receiver desensitization by isolating transmit and receive signals, even with distinct frequencies. The discussion highlights the importance of high-performance, durable antennas and low-loss feedlines, citing examples of equipment installed in the 1960s and 1970s that are still in perfect working order. Operating a repeater is also covered, with an explanation of frequency offset (e.g., the 600 kHz standard for 2 meters) and the function of _CTCSS_ (PL tone) for access. It outlines standard input/output offsets for various bands, from 6 meters to 23 centimeters, while noting regional variations. The guide also touches on features like autopatch and Digital Voice Recorders (DVRs), providing a solid foundation for understanding repeater technology and usage.

Ground Station offers real-time satellite tracking and radio communication capabilities, primarily for amateur radio operators engaged in satellite operations. It utilizes **TLE data** from sources like CelesTrak and SatNOGS for precise orbital prediction and integrates with various SDR devices, including RTL-SDR, SoapySDR, and UHD/USRP radios, to receive live signals. The software provides automated antenna rotator control and **Hamlib-compatible** rig control with Doppler correction, crucial for maintaining signal lock on fast-moving LEO satellites. It supports IQ recording in SigMF format and decodes several digital modes such as SSTV, FSK, GFSK, GMSK, and BPSK with AX25 USP Geoscan framing. Dedicated interfaces are available for satellite tracking, SDR waterfall displays with live transcription and packet decoding, and telemetry packet viewing. Users can manage TLE data synchronization and SDR hardware, along with browsing decoded outputs through an integrated file browser. An observations dashboard and DSP topology view further enhance the operational experience, providing comprehensive tools for monitoring and analyzing satellite passes.

The Sheffield Amateur radio Club was founded in the 1920 and has a very long history of Amateur radio in Sheffield.

TE Systems 0510G 50 MHz meter amplifier set up for 10 watts in and 170 watts out.

RDF Equipment Ideas for VHF Foxhunting and Radio-Orienteering. This information is primarily for the Amateur Radio two-meter band

About Continuous Tone Coded Squelch System. In the amateur radio community CTCSS encode is referred to as Tone in radio programming and CTCSS decode is referred to as tone squelch

This is a Bourne Shell script that will automagically download the FCC Amateur Radio license database, parse it, and populate a MySQL database. The database can be searched using the command line and is very fast.

The HB9CV antenna calculator aids amateur radio enthusiasts in designing antennas for VHF and UHF bands. By inputting the working frequency, users can obtain crucial dimensions like dipole lengths and distances. The tool, based on the HFSS antenna model, provides data on impedance, VSWR, and gain, optimizing front/back radiation ratios. It includes tips for fine-tuning using a Г-matching balun and compensating capacitor, ensuring effective performance and minimal VSWR for enhanced radio communications and direction finding.

SPARC The Saltlake Peaks Amateur Radio Club, founded by employees of L-3 Communications located in Salt Lake City, Utah at the Communications Systems West Division.

SDXF is a Swiss nonprofit organisation, founded in 1998 to help supporting amateurradio expeditions to rare places where little or no amateurradio activity exists.

This web page is part of a self-help program for licensed amateur radio operators and radio pirates.

The Panther Amateur Radio Club is the student run radio club on Pitt's campus. The club's repeater sits 535 feet above the campus on top of the Cathedral of Learning.

A web site dedicate to pedestrian and bicycle amateur radio mobile operations.

MRRC is a club of amateur radio operators who are interested in on-the-air radio competition

Details the custom manufacturing of high-performance RF coaxial cable assemblies, emphasizing the use of _Times Microwave_ and other premium U.S.-made components. The company operates as a Small Business within the Albany, GA, HUB ZONE, with all warehousing and production facilities located in Southern Georgia, approximately 150 miles south of Atlanta. MPD Digital specializes in bespoke cable solutions for diverse applications, including amateur radio, WiFi, satellite, and cellular systems. Highlights the availability of thousands of connector configurations, supported by expert engineers on staff. The facility's total plant area and commitment to rapid shipping on custom cable assembly orders are noted. A specific product, the _MPD-400PVC Super Flex Coaxial Cable_, is mentioned as a recent update.

Amateur radio portable operation has a lot to offer, even if you are a shack sloth and have an awesome setup.

The document discusses the classifications of sunspots and their potential for solar flare activity, categorizing them into Alpha, Beta, and Delta groups based on their magnetic field characteristics. It explains how these classifications relate to the likelihood of solar flares, ranging from minor to extreme events. The report also outlines the geomagnetic indices and conditions that affect high-frequency (HF) radio propagation, emphasizing the effects of solar flares on radio communication and geomagnetic storms. The information is geared towards amateur radio operators, providing insights into how solar activity influences HF radio operations.

Ham Radio Dealer based in Holland dealers of most relevant ham radio brands. Transceivers, antennas and accessories for amateur radio and marine radio markets.

This blog chronicles the development of an 80-meter vertical antenna for amateur radio operation. The author constructs a top-loaded vertical using fiberglass poles, achieving significant performance improvements over their previous end-fed wire antenna. Comparative testing using the Reverse Beacon Network and on-air contacts demonstrates 8-10 dB gain on the east coast. The project evolved to include 40-meter capability through a modified design featuring a four-wire vertical cage, loading coil, and strategic guying system. Despite challenges with signal wobble during windy conditions, the vertical consistently outperforms the end-fed wire, particularly for reaching distant stations during nighttime propagation.

Construct the Peaberry, a SoftRock-compatible SDR transceiver. This project is aimed to build an amateur radio transceiver that operates on the medium or short wave bands

Modification to an old cellular phone base station modules, with a fairly reduced output power (10 watts or so), the stock power amplifier modules will cover the 2.3 GHz and 2.4 GHz amateur radio bands.

The TCARES membership provides communications assistance with fires, floods, search & rescue, and health & welfare message assistance to the Red Cross, without pay, using their own equipment, usually in twelve hour shifts.

DXFile is a Windows shareware application designed for amateur radio operators, providing comprehensive log management capabilities. The software, developed in Pascal, facilitates real-time and deferred QSO entry, automatically populating fields like frequency, mode, and DXCC country based on user input and system time. It includes features for searching, modifying, and deleting QSO records, with options to sort logs by date, callsign, or entry order. The program offers various printing functions, including QSL card labels in multiple formats, and can generate standard logbook printouts. Beyond basic logging, DXFile integrates modules for tracking progress towards major operating awards such as DXCC, _IOTA_, WAZ, WAS, DDFM, and DIFM. It provides detailed summaries of contacts by band and mode, including graphical representations of HF traffic. A dedicated QSL Manager module assists in processing received QSLs, allowing users to mark confirmations and print multi-line QSL labels. The application also incorporates a DXCC list viewer, which can be updated to ensure accurate country and zone data for logging and award tracking. A distinctive feature is its HF propagation prediction module, which calculates optimal frequencies and signal levels for paths between **250 km** and **6000 km**, considering both E and F layer ionospheric conditions. This module helps operators determine the best times for long-distance contacts. Additionally, DXFile includes a _Web-Cluster_ interface, enabling connection to various DX cluster servers like DXLITE, DXSCAPE, and NC7J for real-time spot information.

Opting for a visually appealing inverted L configuration, G4WIF anchors the End Fed Half Wave antenna to an old clothes line pole, seeking cost-effectiveness in their endeavor. Despite initial misconceptions about transformer components, a £7.95 investment in a T240-43 toroid and DIY mounting container resolves the issue. Reflecting on commercial alternatives, G4WIF's homemade solution proves both economical and sufficient for their amateur radio needs.

An ARRL Special Service Club. Meets every Tuesday at Portland Senior Center, 7 Waverly Ave., Portland, CT 06480

NARRI is to promote the development of amateur radio repeaters in Nevada USA

Otto enhances WSJT-X, the popular weak-signal digital modes program for amateur radio. It automates tasks like managing QSOs, prioritizing DX stations, replying to specific calls, and optimizing band usage. Otto works with a modified WSJT-X version (v2.7.0) to add advanced features such as directed CQs, automatic logging, and multi-stream replies. Its intuitive modes streamline operations, while safety measures ensure controlled transmissions. Ideal for DX enthusiasts, Otto improves efficiency and focus, making weak-signal operations more engaging and productive.

Main Trading Company, MTC Radio has been helping Hams All over the country since 2009. Amateur radio dealer of popular hma radio brands based in Texas

The Bishop Auckland Radio Amateur Club

Association des Radio Amateurs Tunisiens

Welkom op de website van de Friese Radio Amateur Groep. Hier vindt u allerlei informatie betreffende de FRAG.

Supporting a telescopic fiberglass antenna pole for ham radio operation. Rather than cumbersome methods like using angle iron or PVC pipes, author employs lightweight tent stakes, toggles, and paracord to secure the pole effectively. With careful knot tying and simple materials, he ensures rapid deployment and stability even in windy conditions, offering a practical solution for outdoor antenna setups.

Meeting point of radio amateurs associations from around the world where introduce and share their activities and experiences. It is about giving voice to all those independent radio clubs of any country interested in exchanging knowledge with the others.

About LoRa, wireless communication technology designed to transmit data over long distances. LoRa provides a means for wireless data transmission over long distances with low power consumption. Practical applications of LoRa in amateur radio

This antenna works on 17, 20, and 30 meters, with the best bandwidth on 20 meters. The bandwidth on 17 and 30 is quite small but usable. There is a 20 KHz bandwidth on 20 meters.

Elkhorn Valley Amateur Radio Club Norfolk

Ham racio clip art collection with free to use images. Additional amateur radio clip art can be found by changing the search term

Magnolia Amateur Radio Club serves the Starkville area in North Mississippi.

A collection of ham radio clip art royalty free. Additional amateur radio clip art can be found changing the search terms.

NPR (New Packet Radio) is a custom amateur radio digital protocol, designed by F4HDK to transport bidirectional IP trafic over radio links on the 70cm band. This IP protocol is optimized for point-to-multipoint topology, with the help of managed-TDMA. Bitrate is up to 500kbps. Home Made modem has a built-in ethernet port to connect to PC. To boost power a DMR amplifier is required to reach 20W. This project is an extension of HSMM - Hamnet - AREDN networks

Online antenna parts store, providing many accessories for amateur radio antenna homebrewing. Boom joiners, aluminium parts, elements clamps, filters, ferrites, fasteners, plasti caps, dipole elements. Based in UL

3B7A Amateur Radio Expedition to St Brandon - April 5 to 17, 2018

The Raspberry PI 3+4 has proven itself as an amateur radio computer. Both at home as the main computer in the shack but also on the road. It is small, inexpensive and incredibly versatile. The operating system and the most important programs are available for free.

Ogemaw Arenac Amateur Radio Society located in the United States in northern Michigan

MLog 0.8d is a freeware logging software designed for Windows operating systems (NT, 98, ME, 2000, XP) that facilitates the logging, management, and analysis of amateur radio QSOs. It features a customizable input mask for rapid contest logging, a robust search function for existing contacts, and immediate data storage in CSV format to prevent data loss. The software also includes a double-check mechanism against reference logs during callsign entry, integrated DXCC information, and a "magic field" for streamlined data input, all within a single-window interface. Key functionalities include graphical QSL card management via _QSL-Collection_, CW output through soundcard or PC speaker, and direct access to _Radio Amateur Callbook_ data. MLog supports transceiver control via _Ham Radio Deluxe_ URLs, offers a detailed world map with locator conversions, and can launch _VOACAP_ through _HamCap_. It provides extensive data analysis options for QSLs, _Locator_ large fields, _DOKs_, _DXCCs_, QSO counts, and user-defined contest evaluations, alongside flexible import/export capabilities for various log formats.

Responsible for the operation of amateur radio repeaters GB3FM, GB3FN and GB3FX which are located near Farnham, Surrey in Southern England

A basic introductionto APRS on HF Bands for radioamateurs and how to setup an APRS tracker using Argent Data Systems T3 Mini TNC device, configured and assemble ready for portable operations.