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VK9MT Mellish Reef 2014 DXpedition official web site. VK9MT 28 march - 9 April 2014

Antennas for the 1296 MHz based on the construction plans of some Yagis 35 elements by DL6WU, F9FT, DJ9YW. These antennas features a boom of about 3 m and gives a gain of about 17.8 dBd

A small antenna for 50 MHz made with copper cable loading coils

A rotary dipole antenna for 30 meters band. Each arm is about 12.5 ft and is constructed from telescoping fibreglass flag/fishing poles and short lengths of aluminium tubing. Two short lengths of glass-fibre rod were used to insulate the arms from the supporting hardware.

Personal radio site, dedicated to ham radio DXing

Solomon Islands H44G/ Temotu Islands H40T - March 2013 by DL7DF

W9TY, the Metro DX Club of South Suburban Chicago, Illinois, USA.

Provide communication service primarily to the public safety organizations

A YL's experience in everything Ham Radio.

A home made end-fed half-wave antenna coupler with antenna lenght calculator and counterpoise calculator based on center frequency. Includes pictures and drawings along to antenna homebrewing instructions with a home made on air wound transformer

VHF-UHF receiver covers from 25 to 800 and 900 to 2000 MHz in the following modes: AM, AM-W, FM, FM-W, FM-N, USB and LSB

Make them simple then Make them work. The LAZY H antenna is a general type of antenna that is in the curtain array family. By placing two 1 wavelength dipoles in a plane that is at right angles to the direction of maximum radiation and keeping the proper in-phase current condition to each element, you can achieve a high gain bi-directional antenna.

Northern Michigian Amateur Radio Club Inc. was founded on the principles of providing services to the local area Amateur Radio Service Groups and to public.This group of license amateur radio operator provide Emergency Communication during the time of weather related,disasters and man made emergencies.

All about RTTY, including audio samples, rtty software, video exaples and rtty related links

Efficient Low Band Counterpoise for Restricted Circumstances Loss Avoidance Opportunities and Techniques for the Low Bands The short and linear FCP was designed to reduce ground losses from inadequate radial systems beneath inverted L and other vertical antennas.

Clicks are most problematic when we try to copy weak signals next to moderately strong signals. How to recognize them, and how to identify clicks problems

Yea Cabrillo2Adif is a free software for converting the radio logs from Cabrillo to Adif log format for MacOSX

A multimeter with standard resistance sorting function

An article on how to measure electrical current with a digital multimeter or analogue multimeter.

This tutorial covers an introduction to RF, wireless, and high-frequency signals and systems, includes explaination of what is RF, why operate at Higher Frequencies, Frequency Shifting through Frequency Mixing.

Large picture and specifications of popular VHF UHF kenwood amateur radio transceiver

New and Used Industrial Generators, specialize in power generation equipment including over 100 new and used engines and generator sets for the industrial, marine, and petroleum industries

A homemade j-pole antenna for six meters band, designed to work on local repeaters, and working on the 52-53 MHz. Includes a list of needed materials and detailed description on assembling the copper tubes used to build this antenna.

Online antenna calculator for homemade double biquad antenna for UMTS 3G 4G WiMAX WiFi frequencies. Article includes also a simple biquad antenna for 4g

This page provides a detailed guide on the Guanella Current Balun for ham radio operators. The author shares very nice schematics, photos, and explanations on the construction and use of this type of balun. The content explains when a balun is needed and how it can help with common-mode currents in antenna systems. It also discusses the construction process, including winding the balun around a ferrite core. This resource is useful for hams looking to improve their antenna systems and reduce common-mode currents for better performance. This article is in Dutch.

The Pamlico Amateur Radio Club (PARC), founded in 1994 and incorporated as a 501(c)(3) non-profit, provides a community hub for amateur radio operators in the Inner Banks region of North Carolina. Affiliated with the _ARRL_ since 2011, PARC supports local ham radio activities and offers resources for those living or traveling near the Pamlico River. The club maintains an active presence, participating in events like Field Day and offering various operating opportunities. Members engage in diverse aspects of the hobby, from DXing to emergency communications, fostering skill development and camaraderie. The club's focus extends to public service, providing communication support when needed within its operational area. PARC's commitment to the amateur radio community is evident through its long-standing presence and continuous engagement, reflecting over **30 years** of service since its establishment.

Dipole antennas are some of the simplest antennas to build in addition to being very efficient and solid performers. I wanted to make a simple dipole antenna for QRP portable operation that could be used on multiple bands.

DXpedition to Kiritimati (Christmas Island) 28 September to 26 October 2011

A ham radio blog primarily focused on newbies and those interested in the hobby. Covers a wide area of subjects that might be of interest to Amateur Radio operators, and material that can be used to study for the Amateur Radio tests.

An 20 30 40 meters trapped dipole antenna plan for sota and portable operations.

How to use the hacked firmware on the MD-380. Tools for working with codeplugs and firmware of the Tytera MD380,

Almaty Amateur Radio League (ARL) is organizing activation of special amateur radio stations including UN2011G and 8 stations with UP2011 prefix.

Valon Technology designs and manufacturers low cost, reliable radio frequency products such as RF Synthesizer modules, RF Frequency Dividers and Phase Gain Detectors. Main markets are military/defense, test engineering, radio astronomy, research centers and universities

A Primer On Mics For Ham Radio. Difference between dynamic and condenser microphones, microphone plugs and differences in kind of microphones available on the market

Balanced and Unbalanced Systems

The structure of this dual band VHF UHF antenna is very simple. It consists of two identical square loops, whose sides measure a quarter wave, connected together at the ends. A project by I5NZR

Electronic components online shop based in Italy

A detailed review of the Icom IC-R75 30 kHz -6 0 MHz Receiver first introduced in 1999

This is a Solid State Amplifier Project. It uses 4 MRF150 MosFet Power Transistors. The Power Supply Voltage is 50 VDC at 21.5 Amp. The max power available is 1,075 Watts. The Efficiency is about 65% +/- and runs Class AB Solid State.

PSK Reporter,is a powerful tool for monitoring your FT8, JT65 or PSK signals around the world. But, even if you are not transmitting on any of these modes it can still be a great propagation tool for determining which bands are open and to where in the world signals from your area are being heard.

Read all the key details about Vacuum Tubes or Thermionic Valves that provided the foundations for today's electronics technology.

An attempt to build a 2m antenna. Consist of a 4 element yagi antenna for SOTA activities

The project in this article illustrates how to do this in a simple and low cost way so that you can easily access the microwave bands using the existing HF or HF/VHF transceiver as IF.

APRS related links and resources by KA9VNV

Communications solutions for Business, Utility and Industrial applications including data phones wireless RF

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

JA8BMK will operate from laos as XW8BM in holiday style operation on 160-10m

The 3Y0K website is the official platform for the Bouvet Island DXpedition scheduled for February 2026. It serves as a comprehensive resource for amateur radio operators, providing essential information about the expedition, including updates on operations, band availability, and communication modes such as FT8 and CW. The site aims to keep the amateur radio community informed about the expedition's progress and activities, encouraging participation and support. Users can find details on how to donate to the expedition and contact information for inquiries, as well as links to social media for real-time updates and community engagement. In addition to operational details, the 3Y0K site offers various resources for those interested in DXpeditions. It highlights the significance of Bouvet Island as a rare DXCC entity and outlines the logistical challenges faced by the team. The website is designed to be user-friendly, featuring a clear layout that allows visitors to navigate easily through the information. Overall, the 3Y0K website is a valuable resource for amateur radio operators looking to engage with the Bouvet Island DXpedition and enhance their understanding of amateur radio operations.

This article aims to help promote the proper configuration for having a clean signal on the waterfall to avoid interference to other users and also to vastly increase the effectiveness of your signal.

Greek Radio Amateur Station from Thessaloniki North Greece