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This is about Small Antenna types and their properties which can help choosing proper antenna for high-frequency wireless communications as: two-way radio, microwave short links, repeaters, radio beacons or wireless telemetry

Our goal is to provide the Highest Quality Products and Competent Technical Services at very competitive rates to the Telecommunications and Recreational Industries.

Noise reduction products

Offering transient voltage surge suppressor, TVSS, patch cables, surge arresters, surge protectors for lightning and power surge protection for electrical equipment, IT networks, communication systems, data lines, relay systems and solid state controllers.

The Pikes Peak FM Association is a nonprofit, amateur radio VHF/UHF group which operates and maintains VHF and UHF communications facilities serving the Colorado Springs and Pikes Peak region.

Radio for Peace International (RFPI) is a Global Community Radio Station located in Costa Rica, Central America that broadcasts progressive news on shortwave radio and the internet on topics of Peace, Human Rights and the Environment. RFPI gives a voice to the voiceless by promoting democratic communication.

Meetings Schedule, study groups, circulars from the radio communication division at ITU

The A QRP Club is a small group of Amateur Radio enthusiasts who enjoy building, operating and (mostly) talking about Low Power radio communications, equipment and systems.

The Holy Cluster is a modern ham radio dx cluster with a real time graphical map of current contacts built and design by the israeli group of developers and supported by the Israeli Association of Radio Communication, the IARC.

TwinsLAN is Minnesota's only amateur radio club devoted to digital communications

To promote Amateur Radio in the Gadsden - Etowah County area and to provide public service to our community in the form of emergency communications.

Applied instruments manufactures test and measurement equipment for the broadband telecommunications industry. products include carrier generators, signal level meters, rf switches, spectrum analyzers and a return alignment system.

The NCVEC is a not-for-profit voluntary association, with membership comprised of the various Federal Communications Commission (FCC) certified Volunteer Examiner Coordinators (VECs).

The Rocky Mount Amateur Telecommunications Assn. is an amateur radio society based in Rocky Mount, NC.

The KnightLites QRP Association is a world wide fellowship of low power (QRP) amateur radio communications enthusiasts founded in 1996, and is coordinated through the efforts of a small group of radio amateurs located in the Research Triangle region of North Carolina in the United States.

Broadband over power lines (BPL) is a technique for transmission of high speed data (broadband Internet) over powerlines. Access BPL technology injects radio frequency energy into powerlines which were not designed for transmission of radio frequency energy, and leak substantial energy that causes interference to radiocommunications service

A non-profit public service and educational amateur radio organization specializing in advanced and experimental microwave communications.

Ham radio activities, from satellite operations, eme communications, dxing and contesting, qsling and direction findings, are just some of ham radio exciting activities

River City Amateur Radio Communications Society

HF Beam Calculator for Amateur Radio and CB Communications

How to calculate range for a VHF antenna with a simple formula and how to increase VHF coverage.

C.A.R.L.A. is a growing network of repeaters providing coverage across Northern & Central California and Western Nevada. It is intended to be used as a reliable communications resource during significant local, regional and wide area incidents, and is open to all licensed amateur radio operators

to promote amateur radio as a hobby in the Yuma area and to provide public service to our community in the form of communications during certain public events.

Bonito, butel wavecom and bogger products dealer. Accessories to decode encode and process radio communication transmissions for Radio Receivers, Transceivers and Scanners

Platinum coast amateur radio society (pcars) w4mlb - melbourne florida, pcars provides hf, vhf, and uhf communications for any police fire and rescue emergency

Tait electronics provides advanced and reliable voice and data radio communications products and solutions, specialising in customised solutions for organisations worldwide.

The Indianapolis Police Scanner on Broadcastify allows users to listen to live police radio transmissions from Indianapolis. The website provides access to emergency communications and public safety broadcasts.

Fountain Valley Amateur Communications Team Located in Orange County, Southern California

Leader in the development, design, manufacture, marketing and distribution of copper, aluminum and fiber optic wire and cable products for the energy, industrial, specialty and communications markets

Non-profit Amateur Radio club organized for the educational and scientific study of electronics and communication

by K6LCS Clint Bradford - Amateur Radio and Commercial Communications. A few current projects, and a little insight into how Clint’s mind works.

Band pass filters, for radio frequency interference problems.

A presentation of the Yagi Antennas, and other interesting tid-bits by Brian Mileshosky. The document provides an in-depth exploration of the Yagi-Uda antenna, detailing its historical development, design principles, and performance characteristics. Originally described in the 1920s, the Yagi antenna features a driven element and parasitic elements, including reflectors and directors, which collectively determine its behavior. The document highlights how element lengths, diameters, and spacing influence gain, impedance, and directivity. It also discusses the antenna's reciprocal nature and presents data on typical gain values for various element configurations. Additionally, the text covers practical considerations, such as the construction of a "Tape Measure Yagi" for amateur use, and touches on related antenna types like dipoles and their application in Near Vertical Incident Skywave (NVIS) communication.

A manufacturer of standby and prime power generator sets for industrial, telecommunication, commercial, small business, mobile and residential applications.

An interesting article on how build an optimal sounding communications loudspeaker capable to optimize sound reproduction at the frequency range from 150 Hz to 3 kHz.

MF TeleType is a program for amateur radio digital communication via sound card, ham radio chat program for extra reliable text transmissions over long distance

Founded in 2000 by Jim Weidner, K2JXW, the ARLHS is the only society devoted exclusively to Maritime Communications and Ham Radio, Lighthouses and Lightships

The C.A.R.E.N. Club is one of the oldest amateur radio clubs in Arkansas, dating back to the late 1950s. Just as the name implies, the C.A.R.E.N. Club is the state leader in emergency communications, SKYWARN, Amateur Radio Emergency Service (ARES), Radio Amateur Civil Emergency Service (RACES).

The document explains the technical aspects of how the Internet Radio Linking Project (IRLP) works, focusing on the use of VoIP streaming software under the Linux operating system. It details the audio sampling, compression, transmission, reception, and playback processes involved in IRLP communication.

Sheriff's Tactical Amateur Radio Communications Hillsborough County Sheriff's Office Amateur radio in law enforcement

Friends & Amateur Radio Communications Enthusiasts

We are a leading developer and manufacturer PMR446 in Korea. Our new developed PMR446 model no. IFR-100 has new function like as private speaker it allow not to speak out from the radio and only you can hear the communication by using a private talk mode.

Association of radio amateurs devoted to the promotion of interest in amateur radio communications in the National Capital Area

Here you will be able to access all of the information regarding our amateur radio disaster relief communications organization, its divisions and volunteer members

An amateur radio organization dedicated to furthering the amateur radio hobby. It consists of members from Oakland, Alameda, Piedmont and other cities in the immediate area.

Innovative quality products for microwave communications

The loma pioneer repeater club - lprc provides 2 meter vhf and 440 uhf amateur radio and emergency communication for the san francisco and monterey bay areas from a repeater on mt loma prieta. aprs digipeater available.

The Kamloops Amateur Radio Club is a non-profit organization that has been incorporated under the Society Act. Our organization has been building and maintaining a network of Amateur Radio mountain top repeaters to enable voice and digital communications between a number of interior communities for many years.

Building the UHF Cheap Yagi for Satellite Communication