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Understanding Amateur Radio NVIS Antennas and Propagation

Ukrainian radioamateur on HF: DX News, Contesting, Propagation, Conference, Photo, Radioamateur Map, Online Logs etc.

1.5 dB of matched line loss can be calculated for a given transmission line using this online tool, which employs a model calibrated from empirical data. The calculator allows radio amateurs to input specific transmission line types, such as _RG-8_ or _RG-58_, and then determine the expected signal attenuation. This is crucial for optimizing antenna system efficiency and understanding power delivery to the radiating element, especially for HF and VHF operations where feedline losses can significantly impact performance. Beyond matched loss, the calculator also provides an estimate for mismatched loss if the Standing Wave Ratio (SWR) is specified. This feature helps operators quantify the additional power loss due to impedance discontinuities between the transceiver, feedline, and antenna, which is a common concern in amateur radio installations. Accurate loss calculations are vital for effective station design and for predicting actual radiated power. The tool's utility extends to various operating scenarios, from fixed station setups to portable deployments, aiding in the selection of appropriate feedline lengths and types to minimize signal degradation. Understanding these losses is a fundamental aspect of maximizing the effectiveness of any amateur radio antenna system.

Indexes over 100 digitized amateur radio callbooks, primarily from the early to mid-20th century, providing a historical record of callsign assignments and licensee data. The collection facilitates research into past amateur radio operations, tracing callsign lineage, and identifying operators from specific eras. Each entry typically includes the callsign, licensee name, and geographic location as published in the original printed volumes. Users can browse the collection by publication date or utilize the search function to locate specific callsigns or names within the archived documents. The resource serves as a valuable repository for historical amateur radio data, supporting genealogical and operational research. Access to these scanned documents is provided directly through the Internet Archive platform, ensuring long-term preservation and availability of these historical amateur radio records.

The gateway to amateur radio in the Hhdson valley

N4MZ Serve the southern part of Baldwin County, Alabama from I-10 to the Gulf Coast and the Eastern shore of Mobile Bay to Florida.

Amateur Radio Hobbies of K4MDB

A 7 dB directional gain is reported for this portable VHF Yagi antenna design, which utilizes cut metal tape measure sections for its elements. The resource details the construction process for a 2-meter band antenna, emphasizing its ease of build and portability. It specifically mentions the design's suitability for radio direction finding (RDF), fox hunting, and communication with satellites and the International Space Station (ISS), highlighting its practical applications for amateur radio operators. The construction cost is estimated at under $20, with potential for even lower expense if salvaged materials like old tape measures and PVC pipes are used. The article references _Joe Leggio's_ (WB2HOL) original design, noting specific alterations made by the author. It also compares this design to other DIY Yagi antennas, including _FN64's_ 2-meter band and _manuka's_ 70-cm band tape measure Yagis, underscoring its unique combination of simplicity, portability, and effective performance with a 1:1 SWR achievable on the 2-meter band.

The Associazione Radioamatori Italiani (ARI) Bergamo section provides a local hub for amateur radio operators in the Lombardy region of Italy. This resource details upcoming events such as the annual _Panettonata di Natale_ and important administrative updates like the 2026 membership renewal process. It also highlights special operating activities, including a commemorative radio activation for the 101st anniversary of the Gleno Dam disaster, which involved operators from both the Bergamo and Vallecamonica ARI sections. The site serves as a central point for local hams to stay informed about club activities and operational opportunities. Members can find information regarding payment methods for annual dues and event schedules. The Gleno Dam activation, for instance, is a significant event, demonstrating the club's engagement in historical remembrance through amateur radio. Such activities foster community spirit and provide opportunities for members to participate in public service and special event operations, often generating **hundreds of QSOs** and promoting the hobby.

Anaheim amateur radio association - k6syu

How to program Baofeng handheld transceiver with satellite frequencies, and how to get alerts when satellites are visible by using a smartphone app. A beginners guide to work satellites with a common VHF handheld radio.

By Radio Amateurs of Northern Vermont

Gsbarc is the home of the great south bay amateur radio club,serving the community of babylon township through pubilic service.

The Sandusky Radio Experimental League Inc,(SREL), is a club of amateur radio operators in Northern Ohio. SREL sponsors the 53.35, 146.655 and 444.375 repeaters.

It is our purpose to further the exchange of information and cooperation between members, to promote radio knowledge, fraternalism and individual operating efficiency

Amateur Tosno contest club Russia ATCC was founded 25.08.2008. ATCC invites everyone who loves ham radio, CW, dx, ssb, digi and contesting, to become a member.

Serving the Community of Federal Way, Washington

Serving the East Valley since 1973

Manufacturer of professional audio test and analysis equipment and of cb, marine and amateur radio accessory equipment.

Industry Canada is pleased to introduce an exam generator software package to facilitate the amateur examination process that our accredited examiners have taken on our behalf.

ARRL has embarked on a project to learn firsthand what D-Star digital technology has to offer and to assess its capabilities in a real-world Amateur Radio environment.

Amateur Radio Club serving Barry & District

We are a Club consisting of 120+ members from the Summit/Portage County area

Amateur radio dealer for all major ham radio brands based in Sweden

Clark county amateur radio club serving sw washington for 75 years! come find out how our local ham club offers programs that cover everything from the history of morse code and call signs to ham radio antennas

The Ft.McCoy Amateur Radio Club is a friendly Club located in the Ocala National Forest, Marion County Florida. The Club was founded in October 1997

H.E.A.R.T. Serving Pinellas County

Servicing the University Park campus of The Pennsylvania State University, and the Penn State Amateur Radio Club.

West Tennessee amateur radio society

High desert amateur radio group, amateur radio operators who live on the Oregon high desert plain that extends from the Cascade Mountains east into Idaho and south to California.

Monterey Bay Amateur Radio Association

TYT Electronics boasts of 15-year experience in two-way radio manufacture. Produce DMR transceivers, handhelds, receivers and mobile radios, analog amateur radio and commercial VHF transceivers

Serving Lapeer County & Surrounding Communities in Michigan

The purpose of the National Silent Key Archive is to collect and preserve photographs, life event narratives, and data artifacts of deceased Amateur Radio operators, and to make the Archive's digital library available to anyone wishing to view its contents online.

Provider of supplemental emergency communications for the Greater Cumberland, Maryland tri-state area, and promoter of amateur radio in the community.

Association of Silicon Valley Amateur Radio Organizations. ASVARO is a California non-profit public benefit educational corporation (501(c)(3)) dedicated to supporting amateur radio for education and public service. Located in the Silicon Valley of California

The Stanford Amateur Radio Club (W6YX) consists of about 50 students, staff, faculty, alumni, and community members.

Amateur radio products,wire and yagi antennas, SDR Receivers, upconverters, pre-amplifiers, towers and RTL funcube dongles by CT1FFU

Established in the early 1970's has a Membership of about 50 men and women

The electchester vhf club is located in flushing, queens, ny and operates an arrl coordinated, 2 meter, vhf repeater designed for amateur (ham) radio use.

Getting Started in PC Soundcard Digital Radio, basics of amateur radio digital modes

The Guernsey Amateur Radio Society (GARS) provides a central hub for amateur radio operators in the Bailiwick of Guernsey, offering resources like a local _GU Callbook_ and specific notes tailored for visiting operators. The society maintains an active presence, holding regular meetings on Friday evenings from 7:30 to 9:00 PM in a unique World War II bunker located within the grounds of the Beau Sejour Leisure Centre. Beyond in-person gatherings, GARS facilitates on-air activity with a 2-meter net operating on 145.525 MHz every Tuesday night at 8:00 PM. Additionally, a DMR net is hosted on Thursday nights at 8:00 PM via the _GB7GY_ repeater, catering to digital mode enthusiasts. These nets provide opportunities for local members and visitors to connect and exchange information. Phil Cooper, GU0SUP, serves as a key contact for the society, managing inquiries and web content. The club's location is precisely described as being down a concrete staircase to the left of the road when approaching the Concourse entrance, making it straightforward for newcomers to find their way to the club's distinctive meeting place.

Receiver performance review of the Kenwood TS-890S HF,50MHz,70MHz amateur radio transceiver by Sherwood Engineering

Sponsored by TARA Troy Amateur Radio Association The worlds very 1st. PSK contest

Ham Radio at its best in the Lakes Area of Brainerd, MN, USA

Provide an ATV repeater function for the North Jersey Exterior Area that is available not only for general amateur radio use, but also for providing a unique communications resource during emergencies as well (FCC Part 97.1 (a))

The purpose of the Indiana QSO Party (INQP) is to encourage contact with Indiana amateur radio stations by other Indiana hams and hams worldwide

The NWAPRS is here to support APRS events, activities and amateur radio enthusiasts primarily in British Columbia, Alberta, Northwest Territories, Washington, Oregon, Idaho, and Montana