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

A basic YAGI UDA online antenna calculator, accept as input frequency, number of elements, diameter of parasitic element and boom diameter. This online calculator will generate a basic design data including each element length and spacing.

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

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

Sri Lanka 4S7 March 2014

Online Log for TX5N DX Pedition to Austral Islands 2022

A CW Contest Simulator, a simulator for the weekly CWT contests sponsored by CWops, based on Arduino Nano

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

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

Generate APRS Passcode using PHP for use in Amateur Radio APRS Applications when connecting to the APRS-IS Network

Allocation of 4 meter band worldwide

Liberia 2011 5M2TT DX Pedition Official web site

Hummelmasten is a German tower manufacturer, provides consultation, engineering, but also assembly and full tower installation

Check out these vintage QSL cards from the 20th Century in this gallery of old QSL cards.

How test transistors and diodes with a simple digital multimeter.

What are the Differences between UV5R and UV82 Series

Introduction to operating on microwave bands at VKFAQ

Stand Alone Software Defined Radio, direct sampling receiver from 30 kHz to 1700.00MHz continuous frequency range, LAN interface for remote access

Ein satellit entsteht und andere amateurfunkaktivitäten...

GM4YEQ Galashiels and District Amateur Radio Society (GDARS)

This article provides details on building a 6 Meter J-Pole antenna using PVC pipe for an enclosure. This antenna uses flat 450 ohm Window Line for the tuning stub.

Notes on using a modified R7100 with discrimator tap

A cavity backed antenna is a practical slot antenna tipically used in microwave applications

Afghanistan 2011 DX Pedition

I wanted to mount an amateur radio antenna on my truck that was more permanent than the magnetic mount on I already had, but I had a few specific design requirements for the project.

The antenna ground or earth system can be key to its operation whilst also being a key safety feature. This article is about grounding systems for antennas, covering different aspects of grounds made for antenna safety, or expressly for lightning or just to improve antenna performance, being ground an antenna component.

Before the advent of satellite communication, maritime communication adhered to an international protocol requiring ships and coastal stations to observe silent periods twice an hour, reserved specifically for emergencies. These silent periods were marked by red sectors on the 500 kHz frequency and green sectors on the 2182 kHz frequency. The 4-second red bars facilitated the manual transmission of the SOLAS distress signal.

RadioReference page on Radio Shack Pro-97

4S7 Log Online Sri Lanka DX Pedition - March 2014

Time Mapper UHD is a versatile mapping and time visualization program offering multi-satellite viewing with frequency display and unique country-pairs for PskReporter data. It features live feeds from logging programs and can plot ADIF files. Ideal for schools, offices, or amateur radio stations, it provides customizable 4K or HD world clock displays with over 60 map layers, including ham radio zones and natural features. The program supports various time functions and can import logs for detailed analysis. It runs on Windows 10 or 11 and offers a 30-day free trial.

For my SOTA activities, i recently bought a QRP transceiver QRP SW-3B, which is a three-band QRP CW only for 40/30/20 m. So, i needed an antenna that would allow to use these 3 bands in SOTA portable activity. Already having some experience with the EFHW antenna, i decided to build one for 40/30/20m.

March 2015 9Q0HQ Congo DX pedition

Republic of Niger 2017 5U5R DXpedition web site 2017 Mar 9 - 2017 Mar 2 Will operate 160 to 10m, also 5.360 MHz; SSB CW RTTY; QSL via EA5RM

Experimental Methods in DSP design. The author explains how a software defined radio works to help other amateurs with their learning. This set of tutorials takes you from how to write a single component to a fully working SDR.

A review of the dual band FT-8800R transceiver by the jeep expedition group

The Davis County Amateur Radio Club (DCARC) serves as a focal point for licensed amateur radio operators in Davis County, Utah, fostering community and promoting radio communication interests. Members engage in various aspects of the hobby, including local nets, public service events, and technical discussions. The club's activities often involve supporting emergency communications preparedness and providing opportunities for skill development among its members. DCARC maintains a presence in the local ham radio scene, facilitating contacts and knowledge exchange. They frequently participate in events like _Field Day_ and offer resources for those interested in obtaining or upgrading their amateur radio licenses. The club also supports local repeaters, ensuring reliable VHF/UHF communication infrastructure for the region. Their website, dcarc.net, provides information on club meetings, upcoming events, and contact details for prospective members.

Ray-trace radio signals through a realistic three-dimensional ionosphere using Proplab-Pro. This software has been used by the military, researchers, universities and amateur radio operators around the world to assist in determining radio propagation conditions and radio signal behavior. It is one of the most respected and well established software packages for radio engineers and enthusiasts, being actively updated for over 28 years.

An article by MicroHam on using the Icom PW-1 RF Power Amplifier safely and with non-Icom transceivers.

A simple 6dBi Collinear Antenna for LoRa compared to the Lorank8 gateway default antenna.

Tennessee SERA District

The VKFAQ page on Visitors' licences in VK outlines the process for foreign amateur radio operators to obtain reciprocal operating privileges in Australia. It details the varying requirements based on the visitor's home country, ranging from direct use of a home callsign with a VK suffix (e.g., G3PHO/VK1) to needing a full Australian amateur radio license. The resource emphasizes consulting the Australian Communications and Media Authority (ACMA) website for the most current conditions and application procedures, noting that agreements are subject to change. Specific conditions are mentioned for countries with recognized license qualifications, allowing for corresponding Australian licenses. For other countries, a restricted license might be issued, typically permitting 146-148 MHz FM operation with a maximum of 10 watts output. Japanese operators with specific 'telephone or telegraph' licenses may receive privileges for bands above 30 MHz, phone only, also with a 10-watt power limit. Visitor licenses are not automatically renewable but can be extended upon request, provided all conditions are met.

Afghanistan 2011 dx pedition online log

Passive Bandpass Filter online calculator and filter formulas. Active Inverting Op Amp Bandpass Filters, Active Noninverting Op Amp Bandpass Filter, just enter the Low ir High Cutoff Frequency

An overview or summary of amateur radio / ham radio contests, contesting and a contest calendar of some of the more popular contests.

Identity of wwff/svff while having a qso with a svff expedition you are welcome to transmit also and two figures

An overview of the development of the Morse key for sending the Morse Code, from the first camelback keys, through straight keys and sideswiper keys to the semi automatic keyers including the Vibroplex to the modern electronic keyer.

West Virginia SERA

A document that includes a list of all countries implementing CEPT licence, with detailed information on licence types like standard CEPT, CEPT Novice and HAREC. A full list of frequencies, and call signs schemas to be used by foreign operators, compiled by Hans Schwarz, DK5JI

Starter Code Plugs and Information for the New DMR User These code plugs were are set up specifically for three UHF repeaters in the York / Harrisburg, PA area. These are working examples only and to be used as guides.