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DX-Summit, is one of the very first **DX Clusters** on the internet,operated by the OH9W OH2AQ Radio Club, offering today a full featured web-based DX cluster, with real-time and even historical DX spots across basically the whole spectrum of amateur radio bands. This web application aggregates **DX spots**, enabling hams to monitor DX activity on frequencies from 1.8 MHz through 47 GHz, including specialized categories like beacons, digital modes, IOTA, QRP, and satellite operations. As all DX Clusters, it is as a critical tool for DXers and contesters seeking current propagation conditions and DX stations activity. The web application utility extends to providing daily DX news (even if not up to date) and a spot search function, allowing hams to research previous activity of a specific call signs on several bands. Features integration with direct link to **VOACAP** predictions, QRZ.com and ClubLog. Access to the service during contest events, expecially the most popular ones, may make the sevice overloaded. The inclusion of a full featured tutorial enhances its value. DX Summit's long-standing operation, maintained by **OH8X**, underscores its reliability as a go-to resource for seeking amateur radio spots and identifying rare DX or unidentified signals.

Basics by From Ian C. Purdie, VK2TIP

This step-by-step tutorial contains everything you need, not only to survive that first contact, but also to learn to enjoy Code and actually do it well. Even if you detested learning it in the first place

Simple eprom programmer for 27Cxx family , used in TNC and G3ruh modem, eprom tutorial, schematics and KissEprom software for windows by iz7ath

RTTY Tutorial by K4WW, foundamentals, FSK and AFSK

Morse Tutor Gold by GGTE Quality Software for Amateur Radio.

Eighteen-part tutorial on packet radio in HTML and ASCII format from Larry Kenney, WB9LOZ

BesserNet Reflectometer is a fun SWR calculator and simulator Java applet

Overview, summary, tutorial about the dipole antenna or dipole aerial that is widely used on its own and as the basis for other antenna designs.

Overview, summary, tutorial about the log periodic antenna or aerial used for wideband RF antenna applications

A short wave regenerative receiver project by Charles Kitchin, N1TEV

W4RNL tutorial on on inductively coupled (link-coupled) antenna tuners

Morse Tutor is a DOS based program written in C++. It can be used to practice morse code. Various options are available. Morse tutor with Complete Source Code and Binary is available for Download (32KB).

MorseGen is a simple program the purpose of which is to generate Morse Code at whatever speed you feel comfortable reading, for practice purposes. It wasn't designed to be a tutor for those who know no Morse at all, although you might find it useful for that purpose. It doesn't have a feature for sending small character groups over and over, although this can easily be achieved by creating text files containing the character groups you want to practice.

This tutorial will set out the design stages required to design a theoretical microwave amplifier

A morse code tutor for the Macintosh.

How to cheaply track ships using AIS and a cheap $20 software radio.

Information and tutorials about all aspects of radio and electronics including propagation, ham radio, electronics, radio history, etc

A morse tutor that drives any Linux supported soundcard.

There are pages with info on the code, pictures of morse keys, a couple of downloadable tutor programs, mystery keys etc.

This tutorial provides step-by-step instructions for setting up the ICOM IC-7300 to work with WinLink and WinMor. The process begins with downloading the necessary USB driver from ICOM Japan, followed by configuring the radio settings through the menu. Key settings include selecting the correct output and data modes, as well as ensuring the USB serial function is properly set. Once the radio is connected to the PC via USB, the drivers will install automatically, allowing for seamless communication. After confirming the installation of the USB Audio CODEC and COM port, users are guided to download the RMS Client Software for WinLink. The tutorial emphasizes the importance of understanding the WinLink system and provides links to additional resources for setup. Finally, it details how to configure the WinMor modem settings, ensuring the ICOM IC-7300 is ready for effective digital communication. This guide is essential for operators looking to enhance their digital capabilities using the IC-7300.

Negative feedback is often referred to as shunt feedback in conjunction with emitter degeneration.

This tutorial will show you how to connect a Morse key to the Raspberry Pi GPIO pins, and how to write code to play tones when you hold the key down. You will also decode the Morse that you're keying so that it comes up on the screen.

A method of installing a PL259 coax connector, a complete tutorial on how to solder Amphenol 83-1SP connectors

Pictures and description for a perfect soldering.A tutorial on soldering technique includes videos.

A tutorial video on manual programming the Wouxun KG-UV8D handheld transceiver

Free basic and advanced system design tutorials for every component and aspect of solar power. Plus system sizing calculators, battery bank calculators and wire size calculators

Aspiring radio amateurs in the United Kingdom preparing for their licensing examinations can utilize this resource, which offers mock exam questions covering the Foundation, Intermediate, and Advanced license levels. The site provides access to question pools, including associated images, designed for use with _Moodle_ learning management systems requiring PHP and MySQL. These question sets are available for non-commercial deployment by UK amateur radio clubs and organizations, facilitating local training initiatives. The original online mock test service ceased operations in August 2018 due to maintenance overhead. The current iteration serves as a repository, allowing other organizations to download the question databases. This approach enables broader access to the exam preparation material, supporting the UK amateur radio community in achieving licensing qualifications. The resource does not offer direct online testing but directs users to other sites, such as _Radio Tutor_, that implement these question banks.

Relay substitution tutorial, power amplifier tuning and Technical Characteristics

Yaesu FTDX3000 Sound card digital modes setup using internal USB interface

How to build a QFH (Quadrifilar Helix Antenna) to download images from weather satellites. A complete tutorial on assembling QFH antenna at home with simple and common tools

Article explaining electronic network of low pass filters

Rtty contesting using writelog for windows. RTTY records and rules, tutorials

Noise foundamentals. Radio frequency interference noise.

Frequencies and location of every meteo radiosonde launching centres in Europe. Equipments, antennas, history, SondeMonitor and BalloonTrack tutorials

Learn quadrature modulation through interactive flash programs. These programs will allow you to learn about quadrature modulation and quadrature demodulation without getting overwhelmed by math.

A source of knowledge for learning about and understanding antennas. The goal is to present a comprehensive tutorial on antennas.

Understanding the operational impact of Broadband over Power Line (BPL) on amateur radio communications is crucial for any radio amateur, especially given the potential for significant radio frequency interference (RFI). This ARRL tutorial delves into the technical aspects of BPL, explaining how the technology operates by transmitting data over existing electrical power lines, which can inadvertently radiate broadband noise across various amateur bands. My own field experience, particularly on the lower HF bands, has often involved tracking down noise sources that exhibit characteristics consistent with BPL emissions, making this a pertinent topic for maintaining clear receive conditions. The resource further details the specific FCC rules and regulations implemented to restrict BPL deployment. These regulations aim to protect licensed radio services, including amateur radio, from harmful interference. It outlines the technical standards and operational limitations imposed on BPL systems to minimize their impact on the electromagnetic spectrum, a critical aspect for contesters and DXers alike. For those engaged in RFI mitigation, the tutorial provides a foundational understanding of the regulatory framework that can be leveraged when addressing BPL-related interference issues. It serves as a valuable reference for hams seeking to comprehend the technical challenges and regulatory solutions surrounding this pervasive noise source.

A nice tutorial and the basics of the software defined radio, SDR, and links of software defined radios to JTRS, and general SDR receiver technology.

Another general tutorial on BPL

Operating the AO-51 amateur radio satellite with a handheld transceiver (HT) presents a practical entry point for newcomers to satellite communications. This resource details the necessary steps and considerations for making basic contacts, focusing on accessible equipment. It covers fundamental concepts such as _Keplerian elements_ for satellite tracking and the importance of understanding Doppler shift effects on both uplink and downlink frequencies. The tutorial outlines a straightforward approach to satellite passes, emphasizing the use of readily available gear. It provides insights into antenna orientation and timing for successful two-way communication. The content aims to demystify satellite operation, enabling operators to achieve their first **AO-51** contacts with minimal specialized equipment. Key aspects include frequency management and basic operational techniques.

Understand how high pass filters are done

This tutorial will get you on the road to running your own live scanner feed on the Internet, be it railroad, fire/ems or law enforcement related.

Essentially, a choke balun is designed to 'divorce' your antenna from the feed line. if your feed line is coaxial cable then you don't want it to be part of your antenna. you want to be able to deliver all your power to the radiator itself, i.e. 'the antenna'. a choke balun does this admirably

A tutorial on using RF frequency counter, how a digital frequency counter works, includes frequency counter specifications and best practices in setting counter accuracy and resolution

A summary or tutorial about the basics of the spectrum analyzer, what it is and what it is used for.

Demonstrates the complete design and development process for a **Low Noise Microwave Amplifier** (LNA), beginning with conceptual design and progressing through prototyping. The tutorial series covers the initial stages of a single-ended first gain stage, focusing on critical parameters such as noise figure, gain, and stability. It systematically details the theoretical underpinnings and practical considerations for achieving optimal performance in microwave frequency applications. This resource provides a structured approach to LNA construction, enabling radio amateurs and RF engineers to understand the iterative steps involved in realizing high-performance receive-side amplification. It offers insights into component selection, impedance matching networks, and the measurement techniques required to validate design specifications, particularly for **microwave** band operation where noise performance is paramount.

Summary, tutorial about the basics of what is a waveguide and the basic waveguide theory.

Using external usb sound card devices for amateur radio digital modes operations

As FT8, JT65 and JT9 are a time synchronized protocol, one soon discovers that an accurate PC clock is very important. If your workstation time is off it can cause you to send when no one is listening, or to listen when no one is sending.