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Effective operation of amateur radio repeaters, particularly in high-density areas, relies on coordinated frequency assignments to prevent interference. This resource from the _Illinois Repeater Association_ (IRA) serves as the official frequency coordination body for the state of Illinois, providing essential information for repeater owners and users. It details coordination policies, guidelines, and application forms for new and existing repeaters, ensuring fair and consistent spectrum utilization. The site also includes a comprehensive band plan, last revised in 2006, and a selective access policy (PL/Squelch Plan) updated in 2015, which are critical for maintaining orderly operations. The IRA website offers various repeater directories, sortable by frequency, city, and region, including a dedicated section for digital systems. These directories are invaluable for hams traveling through Illinois or setting up new repeater projects, helping them identify available frequencies and coordinated systems. The resource also provides meeting minutes, newsletters, and links to other regional repeater councils, demonstrating its role in fostering inter-state coordination. This structured approach to frequency management helps ensure reliable communications and minimizes QRM across the state, supporting thousands of repeater contacts annually.

Clovis Amateur Radio Pioneers, Clovis, CA

Kent County (Delaware) Amateur Radio Club

The Kilmarnock and Loudoun Amateur Radio Club was founded in the late summer of 1980

Angel of the North Amateur Radio Club based in Gateshead, Tyne and Wear - Club callsign - MX0GGP

Basically, this antenna is a 23-foot wire fed through a 4:1 un-un transformer. This antenna can be easily used in portable operation, for operating all bands from 40-10 meters.

Top Loaded Vertical Antenna 3,5 MHz 80m and a 14 MHz Trap for the 20m band. The weight of this portable vertical antenna is less than 1 kg, including the ground network. The weight of the telescopic fiberglass fishing rod is another 1kg. The rod expands from 1.5 meters to 8 meters.

Interested is Lighthouses, in particular the International Lighthouse weekend event in August each year.

Police radio scanners, accessories online shop includes radio scanner resources based in Minneapolis, MN USA

Log Online of the DX-Pedition to The Order of Malta's Italian Relief Corps (CISOM)

Home page with nice DX Tools, VHF DX Cluster map, QRB calculator and personal online log-book

The New England Digital Emergency Communications Network is dedicated to providing reliable amateur radio communications throughout New England. The group members have built an advanced TDMA network connecting strategic locations and communicators

Antennas for Amateur Radio and short wave listening

North Carolina's Largest 2M Repeater Network

ARRL FCC RF Exposure Regulations

The Family Hamfest

Western and Northern Suburbs Amateur Radio Club

High Speed Multimedia (HSMM) radio, as introduced by John Champa, K8OCL, represents a significant advancement in amateur radio's digital capabilities, moving beyond traditional keyboard modes like packet radio. This initiative, driven by ARRL's Technology Task Force, focuses on developing high-speed digital radio networks capable of up to 20 megabits per second. HSMM primarily facilitates digital voice (DV) and digital video (ADV), enabling real-time video transmission from emergency scenes to an EOC without expensive ATV gear, often requiring only a laptop, a PCMCIA card, a digital camera, and a small antenna. The working group's initial efforts concentrate on cultivating microwave skills within the amateur community to build and support portable and fixed high-speed radio-based local networking, or **RLANs**. These networks prove invaluable for RACES and ARES organizations, as well as homeland security and other emergency communications. Field Day exercises and simulated emergency tests (SETs) are encouraged to hone skills in rapid site surveys and deploying broadband HSMM microwave radio networks, with examples like linking Field Day logging stations or antenna test results at the Midwest VHF-UHF Society Picnic 2003. Getting started with HSMM often involves adapting off-the-shelf **IEEE 802.11** (WiFi) equipment to comply with amateur radio regulations, typically operating in the 2.4 GHz ISM bands. While consumer WiFi gear has range limitations under Part 15 rules, proper setup under amateur regulations can extend coverage significantly, with test networks like the Hinternet achieving 5-15 mile ranges at 54 M bit/s using small mast-mounted dish antennas. Careful selection of equipment with external antenna ports, high transmit power, and low receive sensitivity is crucial, along with using low-loss coaxial cable like LMR-400 for optimal performance at these frequencies.

Presents an online callbook specifically for amateur radio operators within Serbia, offering a searchable database of YU callsigns. The resource allows users to query individual callsigns to retrieve associated station information, including operator details and licensing status. It also features a complete list of callsigns registered with the Amateur Radio Union of Serbia, providing a comprehensive directory for the region. The platform includes statistical summaries related to Serbian amateur radio, such as the total number of active licenses and distribution patterns. It displays the last modification date for the underlying data, indicating the currency of the information provided. The web interface is version 1.1.7, developed by YT9TP, ensuring a consistent user experience for accessing Serbian amateur radio data.

5J0BV San Andres y Providencia June 9 - June 23, 2010 by K7BV

Homemade receiver for 80 meters band. The receiver works very well (in fact better than some of its successors), especially the AGC makes listening to 80m QSOs a real pleasure. Sensitivity is not cutting-edge, but on a full-size short-wave antenna it is by fare sensitive enough.

Replacement high voltage metering resistors procedure

Arkansas QSO Party, Amateur Radio Klub of the Arkansas Northwest

Amateur radio loop antenna project using a Comet CVBA-500BC vacuum variable capacitor.

Antenna Analyzer plus 500 is a multifunctional measuring instrument, very useful for amateur radio activity. Its size allows you to easily take it for relocation as well. Frequency range: 100KHz - 500MHz. Access directly via WiFi. Includes a dual-channel signal generator

28.222mhz transmitting with 2 watts of power

A simple reading that allows to understand the basic working concepts and uses of an oscilloscope

Nashua Area Radio Club, Education & Fellowship, meeting 1st Tuesday of month.

The NanoVNA is a very compact handheld Vector Network Analyzer. The NanoVNA is tiny and portable analyzer, and it offers a high performance capabilities with an embedded lcd display.

OEMSEMI is an independent distributor for electronic components, offering worldwide spot components supply service and solutions to obsolete components supply.

What happens in impedance space when the various popular matching networks (antenna tuners) are adjusted

The NERG is an amateur radio club operating in the North East Suburbs of Melbourne, in Victoria, Australia.

A Dutch website dedicated to weather satellite reception with many documents related to antennas, software and techniques on receiving signals from weather satellites.

Complete microphone wiring handbook for most popular radio transceivers provided by Astatic Microphones.

Article with answers to common questions as what cable types to user, cable length, how to join ends.

Manufacturer of software definded radio receivers, antenna switches, preselectors, antenna splitters based in Italy and USA

Reference site of the HAMVOIP AllstarLink AllstarLink provides hams with a means of connecting radios, repeaters or simplex links, over the internet. It is built upon the asterisk open source PBX and runs on Linux

This quick-start guide is an attempt to provide some help when coming to terms with the R20 and the manual

Island of Hawai'i, British Columbia , QUebec, Canary Islands, Wisconsing, Florida lighthouses activations by F5IDM

Amateur radio and two way communication devices online shop based in Sweden

Modifications for Retevis RT3 / Tytera MD-380 includes Hardware Modifications, Codeplugs, Software / Firmware Modifications.

Source for Pelican cases and accessories

Nevada County Amateur Radio Club

Station notes, personal informations and some links

The Reno County Kansas Amateur Radio Assocation is based in Hutchinson, KS, providing Ham radio activites, repeaters, and training to local residents.

Reichelt electronics is a world wide online shop for electronic parts and components

The RemoteTx ham radio remote control system is an economical way to control your amateur radio station through the Internet with a phone, tablet, Mac or PC. There are 3 main parts to the solution. Conveniently operate your station with a smartphone, tablet or laptop anywhere you have Internet access.

An Hentenna project for the six meters band. The standard size of standard hentenna is width 1/6 wavelength x height 1/2. The antenna build in this project is a full wavelenght antenna for the 50 MHz providing a 6.8 dbi gain.

How test transistors and diodes with a simple digital multimeter.

Ham radio club blog