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About the basics of what is a discone antenna for wide band or bandwidth omnidirectional applications

Articles for amateur radio newsletters aimed at new hams by WD4BIS

TN5R Congo DX Pedition - Search the online log

A system designed to automatically tune small transmitting magnetic loop antennas, particularly beneficial for **contest operations** where rapid frequency changes are common. The core of the system involves a PC-based control application, AutoCap, written in C#, which monitors antenna SWR via an external meter and commands a motor interface to adjust the loop's variable capacitor. The software is compatible with Windows and Linux via the Mono framework, offering a graphical user interface for monitoring system status, SWR, power, and motor commands. Key components include one or more magnetic loop antennas equipped with DC or stepper motors for capacitor adjustment, an SWR meter with data output (such as the Telepost LP-100A or a homebrew serial/USB SWR meter), the AutoCap PC software, and a motor interface. The most effective motor interface utilizes an **Arduino-based controller** with custom firmware, providing precise control over both simple DC motors and stepper motors, and supporting features like motor braking for finer adjustments. The system allows for configurable SWR thresholds, pulse widths, and motor effort settings to optimize tuning speed and resolution. Optional radio integration provides frequency hints, enabling the algorithm to learn the relationship between motor actions and resonant frequency, thereby speeding up initial tuning responses. The software also supports antenna profiles, allowing operators to save and recall specific configurations for different loops, including accumulated frequency hint data.

A simple coax cable tester built based on the KG0ZZ project.

Easy to build RS232 keying interface for FSK and CW. Works with most popular RTTY software like MMTTY. Also works for with most contest software such as N1MM and Writelog for CW keying. Uses the RS232 port RTS, DTR, or TX data, optically isolated, PC boards available.

The MEL PICBASIC Forum serves as a community hub for users of Micro Engineering Labs PICBASIC compilers, facilitating discussions related to PIC microcontroller programming. It features dedicated sections for various compiler versions, including mel PIC BASIC, mel PIC BASIC Pro, and PBP3, each containing numerous threads and posts detailing specific programming challenges and solutions. The forum also provides areas for frequently asked questions, general PIC BASIC discussions, and commercial assistance requests. Specific sub-forums address advanced topics such as PBP Extensions, Code Examples, and AI and PICBASIC, offering insights into extending compiler functionality and integrating artificial intelligence concepts. Furthermore, the platform includes sections for Data Communications, covering USB, I2C, 1-Wire, GSM, and serial communications, which are critical for interfacing PIC microcontrollers with external devices. A dedicated area for PIC Programmers allows for discussions on programming hardware and techniques. The forum's utility is enhanced by its extensive archives of user-contributed solutions and examples, which can assist hams in developing microcontroller-based projects for radio applications. The platform's structure supports knowledge exchange among hobbyists and professionals working with PIC microcontrollers.

Friends keeping in touch via amateur radio and RV's

Hellenic news agency

World Map - Time Zones realtime map allow to select and display current time for selected regions

Palm radio palldes, german maker of popular Mini-Paddles, small keys and mini bugs

Informations about RADIO 101, constructing home brew transmitters, pirate radio, pagers, salsa, latin-dances, tango, Ecuador, Quito, Ukraine, Kiev, Ireland and more. Themen: Sendetechnik, Sender, Piratensender, Schaltpläne, Baupläne, Magnetkarten, Irland, Ukraine, Ecuador, SMS, Pager etc

Many Hams suffer from a cruel obsessive-compulsive disorder. They're driven to achieve the lowest possible SWR even when it is not necessary by WB8IMY

Photos from around the world of perhaps the most famous QRP project ever created. Vintage 1970's and newer versions of the Tuna Tin Two are featured.

Pitcarin 2012 - VP6T Online log at clublog

This is a one for all antenna tuner with wide range tuning on all the HF bands. The tuner is based on a G3WQW design. DIY project by PD7MAA

Online calculator and a full documented pictorial guide to build a single sided 8 slot waveguide antenna

Kenwood TH-D7(G) and TH-D7A commands reference

A table summarizing common coax cables features

Mods for Icom 756 Series including eSSB Mid-Fi Mods for Receiver and Transmitter

A 2 meter dipole antenna by KV5R

Shortwave listeners and amateur radio operators interested in _numbers stations_ can engage with this mailing list, which serves as a platform for discussing the enigmatic transmissions. The resource facilitates the exchange of information regarding these unusual broadcasts, often associated with intelligence agencies, by allowing members to share observations, decode attempts, and theories. It provides a community space for those who monitor the HF spectrum for these unique, often automated, voice or digital signals. Participation on the list enables members to contribute to a collective understanding of numbers station activity, including changes in frequencies, broadcast schedules, and message formats. While specific technical analysis or signal processing techniques are discussed by members, the primary function is information sharing. The list is administered by csmolinski at blackcatsystems.com, and prior postings are archived for reference, allowing new members to review historical discussions and data.

Showcasing a range of precision-engineered Morse code paddles, UR5CDX emphasizes craftsmanship in both dual and single paddle designs. Each key, such as the _Eridan MX_ or _CT 73 MB_, is engineered for optimal performance, catering specifically to the needs of CW operators. The paddles are not merely tools; they reflect the artistry inherent in ham radio equipment, with options for personalization like _Callsign engraving_ and _3D nameplate_ tags. The commitment to quality is evident in the materials used and the precision of the mechanics, ensuring reliable operation during contests or casual QSOs. Yury, UR5CDX, also engages with the community, sharing insights on the manufacturing process and the impact of current events on production timelines, fostering camaraderie among operators who appreciate the nuances of Morse code communication.

Pictures of the Yaesu FT-450 at mods.dk

Quality repair of Kenwood and Some Icom equipment

This article will help the New Ham to be more at home on repeaters and understand the operation and procedures on Ham Radio Repeaters.

PetitTrack is a satellite tracker for the Sharp Zaurus SL-5x00 Linux PDAs. PetitTrack is based on the keplerian propagator algorithm used in kd2bd's Predict software.

Pneumatic Antenna Deployment Systems

RACOM is a Czech company specialized in design and production of radio modems and other devices for wireless data networks for radio channels from 140 to 900 MHz. RACOM radio data networks are suitable for data transfer in telemetry & SCADA applications, transaction networks, security systems, IP networks and firts of all mobile tracking and fleet management.

Benelec Pty Ltd specializes in the design and manufacturing of **antennas** and RF components, covering a broad frequency range from 0.002 GHz to 8 GHz. Their product line includes Land Mobile Radio Antennas, such as HF 2-30MHz, VHF 40-180MHz, and UHF 200-520MHz models, alongside specialized Military Antennas for dismounted, UxS, C2, and EW applications. The company also produces Cellular Antennas, including 4G/5G and GPS/GNSS types, and Marine Antennas for both vessel-mounted and fixed-site installations. Additionally, Benelec offers a comprehensive range of coaxial cables, connectors like N-Type and SMA, and various radio accessories. The company's offerings extend to RF components such as duplexers, diplexers, and 50 Ohm loads, as well as DAS components like directional couplers and hybrid combiners. Benelec provides EMP and lightning protection solutions, including 1/4 Wave Stub protectors and replaceable GAS capsules. Their product catalog also features P25, DMR, and FM Analog radios, along with portable and mobile radio accessories like batteries, chargers, and cabled headsets. The company supports various sectors with robust communication solutions.

Shortwave radio receivers review site featuring radios by JRC AOR Icom Kenwood Lowe Yaesu Perseus SDR CiaoRadio SDR Drake Hagenuk Sony Kneisner&Doering Reuter and RadioJet

Educational software for Palm Pilot and Windows that quickly teaches Signal Flags and Morse Code using mnemonic techniques and a well designed flashcard program

The Rolling Home Ham Radio on the Road

The antenna consists of 6 runs of stranded wires spaced by plastic Hula Hoop spacers made of poly tubing

A good reference site for antique radio, bakelite paskon plastinc decription, microphones picture and antique radio gallery

The club was formed at a meeting of a group of hams on a May 1989 afternoon at Jake's Truck Stop in Bend.

Amateur Radio club for International Falls and surrounding area.

Article by G4AON about a 4 and 2 Element Quad Antennas for the 6m band

A home made slingshot for wire antenna setups

ABC Vacuum Tubes is dedicated to providing Ham radio, amateur radio operators, antique radio enthusiasts, audio professionals and hobbyists the ability to choose from an inventory of over 3.5 Million Vacuum Tubes on hand under one roof.

Homebrew Solar Panel 60Watts. Building a homemade solar panel from solar cells that would have otherwise been thrown out.

The HF horizontal loop has been around for many years now. This article includes a YouTube video and discusses the reasons for looking at this antenna, its design, and its installation. There are some on-air comparisons against three regular double bazooka (coax) dipoles and the Par SWL End-Fed antenna.

Millimeterwave/Microwave transmission lines and components, Cryogenic temperature application transmission cables and systems, Permittivity(Dielectric rate) and Permeabillity measurement systems, Antennas, Radar systems

We are the Radiating Element of the tri-state area composed of South Dakota, Iowa, and Minnesota.

VHF UHF SHF Toplist including DXCC and EME-Initials

The Providence Radio Association Incorporated, one of the oldest radio associations in the world.

eham reviews of the Yaesu FT-9000

Pages fully dedicated to beginners guides, includes an interesting sample of a CW QSO, and a list of frequencies to practise morse code, useful for beginners,

VK3OT audio recorder qsos.

CB radio, Scanner, 2-way radios dealer in UK