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What is VSWR and why you should care, formal definition of VSWR and SeaSonde Measurements, formulas

The Eastman Amateur Radio Club (VE4TG) operates a **VHF repeater** at 146.73 MHz and a **UHF repeater** at 444.15 MHz, both located at the Manitoba Hydro gas-fired generating station near Selkirk. These repeaters are situated on the power plant roof, leveraging its infrastructure for antenna placement. The club's primary objective is to offer a reliable local repeater site for members in the East Selkirk and Lockport areas, ensuring consistent amateur radio access. Beyond routine communication, the club maintains a standby communications link to assist local municipal authorities during emergencies requiring communications support. The unique repeater site location at a generating station provides a robust backup power supply, enhancing reliability. The club also organizes activities such as a weekly net and participates in WARC Field Day, fostering community engagement and operational readiness.

A world-class amateur radio contesting club, is represented by two chapters in North Carolina and extends as far north as Pennsylvania and Delaware.

From 1921 to 1924, radio amateurs experimented with transmitting across the Atlantic. Everyday Engineering magazine organized the first sending test with English amateurs prepared to listen for signals from the US

A complete list of resources for the Kenwood TS-850 mantained by TK5EP

Noise bridge circuit to tune your tuner

Feidaxin FD160/FD150 repeater programming instructions

BPQ32 allows a computer running under Microsoft Windows to act as a Node in a NET/ROM compatible AX25 network, and to support a multiuser Mailbox, or other similar applications.

An introduction to develpment of morse keys in radiotelegraphy history

Using a simple calculation, measure the distance between Earth and the Moon with the help of a local amateur radio station

Police scanner buying guide gives you everything you need to buy the best police or radio scanner. Includes, images, helpful links & more.

Wild Rose Chapter 151 - Alberta

Fast Scan Amateur Television in Alabama, Arizona, Northern California Southern California, Georga, Illinois, Indiana, Kentucky, New Mexico, Nevada, Texas, Washington, Delaware, Maryland, New Jersey, and Pennsylvania.

The florida qso party, sponsored by the florida contest group, takes place the 4th full weekend in april.

Founded in 1933 in Flint Michigan

The Southeastern VHF Society (SVHFS) is a not-for-profit organization incorporated to promote amateur radio operation on the bands above 50 MHz in the southeastern United States.

PropNET is an ad-hoc 2-way (and potentially, "more-way") RF-based digital communication network whose activity is reported on the Internet. As participating stations periodically ID and exchange data, they report their activity to an Internet data-collection hub for presentation through this web site.

The Society Radio Operators, Chicago Illinois

Developing operational amateur radio equipment for the 134 GHz band presents significant technical challenges, particularly in frequency generation and stability. This resource details the construction of a 134 GHz system, outlining its architecture with separate transmit (Tx) and receive (Rx) modules, each employing a local oscillator (LO) and RF head units. The system utilizes a dual Flann 50 GHz lens-type horn antenna configuration for optimal signal coupling. The transmit path incorporates an LMX2541 synthesizer chip operating at approximately 2.8 GHz, referenced by a 10 MHz double-oven Morion OCXO for exceptional stability. This signal is multiplied through a series of stages (X4, then X2) to generate a 22.4 GHz signal, which subsequently drives a dual series diode multiplier to produce the final X6 signal for 134 GHz operation. The receive side features an anti-parallel diode mixer coupled to a 144 MHz transceiver via a preamplifier, ensuring effective downconversion. Operational mode is CW, achieved by keying a multiplier stage. The project includes images of the Tx and Rx head units and describes a successful 3.5 km test with G8ACE, demonstrating stable signal tones due to PLLs locked to OCXOs at both ends, confirming the system's robust performance.

Effect of radials on the efficiency of antennas.

The elgin amateur radio society Illinois

G6LVB beginners guide to receiving the AO-40 beacon

Summits on the air, sota. an exciting new award scheme for radio amateurs. the scheme encourages lightweight portable ham radio operating in mountainous and wilderness areas areas.

Approximately 30 active members comprise the _Racine Megacycle Club_, W9UDU, a long-standing amateur radio organization based in southeastern Wisconsin. The club provides a local hub for hams interested in various aspects of the hobby, including contesting, DXing, and technical experimentation. Regular meetings offer opportunities for knowledge exchange, project collaboration, and social interaction among licensed operators. The club actively participates in public service events and promotes emergency communications preparedness within the community. They often host field day operations, providing hands-on experience with portable setups and demonstrating the capabilities of amateur radio to the public. Membership is open to all licensed amateur radio operators. Their website serves as a central point for club news, event announcements, and contact information, supporting the club's mission to advance the art and science of amateur radio.

Since November of 1998, The Freewheelers Net has been on the air on 3.916 MHz

Clay County Missouri

Provides this Web site as a public service to all radio amateurs within the city of Huber Heights and the Miami Valley of Ohio.

Radioklub Nokia is the Amateur Radio Club Station for Nokia employees and family in the Dallas - Fort Worth area in Texas, USA.

How to limit unwanted harmonics from your raspberry Pi radio transmitter by introducing filters.

A modified Hairpin antenna for a wider bandwidth an mounted on a grounded metalic mast

N4ZOU Article on AMTOR mode on eham.net

This group is located just north of Reno, Nevada and primarily uses simplex frequencies.

How to program the memories of the Yaesu FT-7900R without a computer

NEC models are used to explore the GR5V and ZS8BKW optimizations. A third optimization is also rediscovered. The effect of fixed lengths of 75 ohm coax are explored. A link to the NEC model is provided.

From somewhere in mediterranean

Building the Three-Element Hex Beam. A project and construction phase of an HF hex-Beam antenna using trees to hang the antenna and a Channel Master antenna rotator.

The website for the Northern California Amateur Radio Kids Group.

A resource page for Kendoowd TS-850 HF transceiver

The Washington Totem Award recognizes licensed radio amateurs who submit proof of two-way radio contact with the state of Washington. Applicants must confirm contacts with a specified number of Washington counties, with different requirements for stations located within and outside the state. For example, stations outside Washington need 25 confirmed contacts from 25 different counties, while Washington stations require 15 contacts from 15 different counties. Contacts must be made after January 1, 1970, and may be established on any amateur band using any mode. QSL cards or other acceptable proof of contact must be submitted with the application. The award promotes activity within Washington state and encourages DXers to seek out contacts across its diverse geographical areas. Applications are processed by the Western Washington DX Club, which also manages the award rules and verification process.

Accurate meteorological data is crucial for optimizing antenna performance, predicting propagation, and ensuring safe tower work. This resource provides a curated inventory of weather stations, including models like the _AcuRite Atlas_ with lightning detection and the _Ambient Weather WS-2902_ WiFi Smart Weather Station, which offer real-time data on environmental factors. The product listings detail specific features such as direct-to-Wi-Fi connectivity, rainfall tracking, and temperature insights, enabling informed decision-making for various amateur radio operations. The platform categorizes products by application, featuring weather stations tailored for home and backyard use, as well as more robust systems for farm and agriculture, which can be critical for field day operations or remote station monitoring. It also highlights _Made in USA_ options, emphasizing local manufacturing and support. Beyond weather instruments, the site also presents related surveillance technology, such as the _Waggle solar CCTV camera_, designed for outdoor reliability with an IP65 weatherproof rating. This integration allows for comprehensive monitoring of remote ham radio shacks or antenna sites, combining environmental data with visual oversight.

A website for college and university amateur radio clubs to showcase themselves, work together, and promote amateur radio. Alumni and interested people can learn more about what college and university amateur radio clubs are doing.

A prototype of a switch foot made on a square aluminium stock frame

The Amateur Radio network now known as the Caribbean Emergency and Weather Net was established in 1958 by Colonel Henry Frew, KV4BZ, for the purpose of having a general calling frequency for the Caribbean Islands and our North and South American friends.

The Magloop Antenna Calculator was developed to predict the characteritics of a small-loop (aka magloop) antenna, given physical dimensions entered via slider widgets. This magnetic loop antenna calculator works also on most mobile devices, adjusting sliders and calculating dimensions in real time.