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Utility-Driven Tradeoff Analysis, if you want to geto on the microwave bands , you will have to choose the proper antenna for your operating conditions. How to decide is not always easy, and you may also decide to build your own antenna.

Adapted from a similar project by NA4IT. Made with one quarter wave 2 meter radiating element pointing upward and it is surrounded by four 70 cm elements.

Frequently Asked Questions - about vintage tube-type ham radio and communications equipment

Features an immense gallery of color photos, facts, newsletters, articles and links for those interested in collecting or restoring antique radios

Are you organinzing a dx pedition? Some countries may require a visa before arrival. Find visa requirements here

AFR Enterprises a leading distributor of electronic components, semicondustors, diodes, Resistors, Integrated Circuits across the USA.

Elecraft K3 pictures, inside pictures, assembly and case.

The Kenwood MC60A with preamp, suffers from RF feedback, a search on the web reveals the extent of the problem. This document explain how to fix this problem.

The Sudbury Amateur Radio Club is an incorporated non-profit organization.

The No-Nonsense Extra Class License Study Guide (for tests given between July 2016 and June 2020) This is the study guide you want if you want to pass the Extra Class exam

Clays Radio Shop offers an impressive selection of quality CB radios & accessories. Specializing in mobile CB and 10 meter communications.

STØR Souther Sudan dx pedition july 2011

Provides custom battery pack assembly services, focusing on portable power solutions for two-way radio applications. The company distributes batteries from numerous manufacturers, ensuring a broad selection for various radio models. This includes replacement packs for popular brands such as _Kenwood_, _Icom_, and Yaesu handheld transceivers, as well as batteries for CB radios and scanners. The core business function involves designing and building specific battery configurations to meet unique customer requirements, extending the operational life of portable radio equipment. Their offerings support a wide range of amateur radio activities requiring reliable, field-deployable power sources. Advanced Battery Systems also supplies individual cells and components, enabling radio operators to repair or rebuild existing battery packs, potentially saving costs compared to purchasing new OEM units. They emphasize durability and performance in their custom builds, aiming for **extended cycle life** and **consistent power output**.

Windows shareware contest log program for the ARRL 160 meter contest

This is a 30-watt sea level beacon intended for the coastal path between Northern and Southern California

In the realm of amateur radio, **challenge coins** serve as a unique tool for fostering community spirit among operators. These coins are increasingly popular among clubs, providing a tangible way to recognize participation and contributions. Customizable options allow clubs to create unique designs that reflect their identity and achievements. Coins can be awarded for various milestones, such as membership renewals or event participation, enhancing engagement within the group. Additionally, military affiliates like MARS benefit from these coins, reinforcing their connection to the broader military community. The production process is streamlined, with artwork assistance available to ensure clubs can easily implement their designs. Each coin can be tailored in terms of plating and color, allowing for different levels of recognition within the club. This flexibility makes challenge coins a practical and meaningful addition to any amateur radio organization, promoting unity and pride among members. Clubs can leverage these coins not only for internal recognition but also as fundraising tools, further supporting their activities and initiatives.

A group of ham operators in Orange County, California that has supported over 30 hospitals since 1980. Includes information on how hams can provide hospital support in their own areas.

This forum is to bring together all interested in Amateur Radio both listeners and Operator's alike from all over the world

Presents a personal blog, "QSL, maraca!", maintained by Luiz Belem, PY1UR, detailing his amateur radio endeavors. The content includes posts on station setup, operating experiences, and general ham radio topics, reflecting the perspective of an active DXer and contester. The blog serves as a digital logbook and platform for sharing insights with the amateur radio community. Documents PY1UR's participation in various on-air activities, showcasing his QSL card collection and providing narratives behind specific contacts. It offers practical insights into antenna configurations and radio equipment used, demonstrating effective strategies for achieving **DX contacts** and improving station performance. The blog's entries provide a historical record of PY1UR's _amateur radio journey_.

Showcasing a diverse portfolio, RF Industries specializes in interconnect solutions crucial for modern communication infrastructure. Their product line encompasses a wide array of RF connectors, precision-engineered coaxial cables, and robust data cables, all designed to meet the rigorous demands of wireless and wireline telecom, data communications, and industrial applications. The company emphasizes its role in "Connecting the Next Generation" by providing foundational components for evolving network technologies. Their offerings extend beyond basic components to include comprehensive installation and test kits, alongside various adapters and wire harnesses. This focus ensures that their products not only perform reliably in the field but also integrate seamlessly into complex systems, supporting critical infrastructure. RF Industries' commitment to quality and innovation positions them as a key supplier for those building and maintaining advanced communication networks, from _5G deployments_ to industrial control systems, ensuring signal integrity and robust connectivity.

A very well done presentation about End-Fed Half-Wave antennas. This PDF document contains a summary of experiences in how to build custom EFHW antennas. Includes an interesting comparison table of UnUn configurations with recommended toroids, Wire size, turns and capacitors. An useful recap on common errors in building homebrew EFHW Ununs completes the document.

Knowledge and guide on Amateur Radio mix in Malay & English Language for Malaysian SWL & Amateur Radio Operator.

Antenna and Power considerations, ALC Keying interface, Battery info, Keying interfaces and more

Brugtgrej presents a Danish online classifieds platform specifically for amateur radio operators and electronics enthusiasts. The platform facilitates the buying and selling of used equipment, including transceivers like the Icom IC-7410, various components such as X'TAL FILTER FMT-15A and TRANSISTOR 2SC3019, and accessories like Sadelta microphone capsules and SMA to SMA extenders. Users can post free advertisements for items they wish to sell or acquire, covering categories beyond amateur radio, including antique radios, military radios, and radio tubes. The site lists active advertisements, with 3136 online ads and 167 online users at the time of analysis, indicating a dynamic marketplace. It also features a forum for community interaction, discussing topics like repeater rings on 1297 MHz and FT8 activity. The platform's structure supports both 'Sælges' (for sale) and 'Købes' (wanted) listings across its various sections. Specific items observed include a Miniwatt pentode 4689, various capacitors and coils, and general electronic components, demonstrating the breadth of offerings available to the amateur radio community.

Radioing Collins Radio collection

Interesting article about amateur radio mobile installation for HF VHF UHF bands in a Toyota Tacoma truck

Based in Katy Texas

A portable (15.5 foot diameter) NVIS loop for 3.5 to 7.3 MHz. Performs well at high and low takeoff angles, and has smaller footprint than most NVIS antennas.

A light and sturdy Quad for 10 and 15 meters. Basic Quad antenna design considerations. Building and assembling a dual band HF QUAD antenna, designing and joining cross-arms and boom, assembling spreader and element wire installation notes. QST article.

91ET104 or 91ET/DX, Egi Noerman van Beekom West java Indonesia.

One way to keep your home station on the air during a power outage.

Building an amateur station for competitive radiosport involves a number of critical steps, regardless of the band or bands you focus on. These include, but are certainly not limited to: Station layout, Equipment interconnection and switching, Inter-station interference, Antenna selection. Radio interface with the logging program, CW and voice keyer integration, Rotator control

Manufacturer of precision equipment, Power meters Wattmeters

Making EME contacts on six meter band. An US Experience using a pair of 8 yagi arrays for the 50 Mhz.

Pilot of The Airwaves

Mic online calculator , Microphone Dynamic Range Calculator, Microphone Sensitivity Calculator

A simple TVI Filter schematic

The Rideau Township village of Manotick, Ontario was founded in 1854 by Moss Dickinson and is located about 20 KMs south of Ottawa along the picturesque Rideau waterway.

The 40dB fixed attenuator is derived from two 20dB Pi attenuation pads

German association dedicated to digital radio communications

ASAP Semiconductor is a premier source for all long lead-time, hard to find, and obsolete components.

The K7ICU repeater system is situated about 500' above metro Tucson, at the base of the Catalina Mountains. It is an open system providing coverage to the greater Tucson area.

DSP-100 Hi-Fi TX and RX Mods for the TS-850S by KA0KA

Discussion group about RTLSDR Dongles, software support and hardware mods for these Software Defined Radio systems based on RTL2832U

A small amateur radio club located in northern Maine along the Saint John River.

Dowload free morse flash cards, and start learning morse code flipping the cards

DIY speakers, resources for custom speaker hombrewing

In this article the author shows the receiving loop antenna for 160 meters band installed at his QTH. Diagram and movie available. Article in in Turkish but can be translated in english