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Descriptions, summaries,and tutorials about electronic circuits and electronic circuit design including amplifiers, attenuators, logic, transistor, operational amplifiers and much more

A complete guido to 4 Metres band for beginners

Vacuum Tube Data by Duncan Amplification.

Article about the microstrip antenna, which is also commonly referred to as the patch antenna.

VHFDX mobile dx cluster version

Presents the Carolina DX Association's (CDXA) _Contest Corner_, a dedicated resource for amateur radio contesting activities. It features a curated contest calendar, linking to external resources such as the _WA7BNM Contest Calendar_ and the _ARRL Contest Calendar_, providing a broad overview of upcoming events. The page also details CDXA's internal contest programs, including the "CDXA DX King" and "CDXA DX King Classic" for 2026, with specific links for members to submit their scores. Furthermore, the resource integrates with _3830Scores.com_, encouraging CDXA members to submit their contest results and select the club affiliation for tracking. It provides a direct link to view aggregated scores from participating CDXA members, fostering club competition and recognition. The "CDXA Periodic Table of Contest - 2026" is also mentioned, indicating a structured approach to contest planning for the year.

The I2YSB DXpedition Team presents a collection of videos documenting their past DXpedition activities. These visual records offer insights into the operational aspects, equipment deployed, and environmental conditions encountered during various DXpedition events. The resource also contains a specific announcement regarding the cancellation of the planned Ghana AF-084 DXpedition, originally scheduled for April. It further details the refund process for sponsors who had contributed donations for the cancelled operation. The content serves as an archive of DXpedition experiences, showcasing the efforts involved in activating rare or challenging entities. It provides a historical perspective on the team's operations and logistical considerations. The site also functions as a communication channel for important updates concerning future or cancelled DXpedition plans, directly addressing the amateur radio community interested in their activities.

Article on how to use logic analyzers for testing complex logic-digital circuits

New PA stage for good old Atlas 350XL HF transceiver

A description and build-log of a cheap telescoping mast made from PVC pipe, string, and some misc mounting hardware. It is useful if you are going somewhere that doesn't have any trees nearby to hang something on.

Official page of the IARU High Speed Telegraphy Championships

How to handle feedline radiation issues

Introduction to troposcatter or tropospheric scatter propagation using the troposphere

PileUP! - magazine supporting OH contesting since 1996

A complete list of resources for the Kenwood TS-850 mantained by TK5EP

AmTOR may be considered as the next development from RTTY. AmTOR was introduced to overcome the problems with RTTY. As a result of its performance, it has become popular on the HF bands because it gives more reliable communication, especially when interference is present. It achieves this by using a coding system that allows errors to be detected and corrected.

Amateur radio antennas manufacturer based in Italy. Produces HF end-fed, dipoles, and other wire antenna types, mono band and multi band antennas.

An introduction to develpment of morse keys in radiotelegraphy history

VHF DX Announcements

Online HB9CV antenna calculator, accept as input the desired resonating frequency and provides dimensions for spacing and length of each element, including boom and radiator diameter.

How to limit unwanted harmonics from your raspberry Pi radio transmitter by introducing filters.

H44G Log Online Solomon Islands Temotu Islands

Licence types in Australia and How to get a licence.

Introduction to packet radio and answers to common questions about this digital mode and about services you can use by VKFAQ

Visual Wais is a free HAM (Amateur Radio) software to manage WAIS (Worked All Italian Squares) award. With few clicks, it allows the complete award management, from QSO insertion to endorsement requests.

An overview about the UHF connectors often referred to as the PL259 plug and SO239 socket used for many RF applications. Limitations, history and soldering properly UHF Connectors

Volunteer Amateur Radio operator organization providing emergency communications services to charitable events and in large scale disasters.

A resource page for Kendoowd TS-850 HF transceiver

Online log for TX7T DX pedition from Marquesas

DX Pediton to South Georgia VP8SGI Log Online IOTA AN-007

This page introduces the world IARU Grid Locator system, and discusses how to find out what your own Grid Locator is.

Harleys, Astronomy, HAM Radio, and other stuff

The Pro 95 is a dual trunking handheld scanner designed by GRE and sold by Radio Shack

Software running on the Raspberry PI, Control up to 8 arduino rotators modules, Azimuth maps, Cluster support, Band decoder, contest Web Log, Webcam with RaspiCam support

+/- 15 V, 1.5 A power supply project

Article descrive the different types including coax and open-wire feeder and waveguide.

An extensive document about Morse Code in amateur radio edited by W5ALT

A comparison of commercial 4m verticals by by Ian Hogan G6TGO

A Web forum dedicated to HF underground and in particular to Shortwave Pirate Radio Forums and Spy Numbers listenings

Key details about the superhet or superheterodyne radio reeiver: basic overview; how it works; applications; design notes, all you need to know.

Microwave band plan - frequancy assigned to ham radio service

RF is causing strange issues on the touch sensor buttons, controlling inputs, volume, channels on Samsung LCD TV. Solution is to disable front touch panel.

This FM wireless mike can transmit voice signals to any FM Radio receiver 100 meters away.

The MD-2017 is a dual band DMR and Analog handheld transceiver with a frequency range on VHF 136-174 MHz and on UHF 400-480 MHz

AM Operation Using Power SDR with Flex and Other SDR Platforms

World-Wide 50MHz Beacons database maintanied by G0LGS provide a fully sortable table available also in a google map format

an overview, introduction or tutorial about the basics of electronics filters including the types of filter and the various filter design considerations and parameters

Article about tropospheric propagation and the way in which radio signals at VHF and above propagate over greater distances than strictly line of sight in the troposphere

Togo DXpedition 5V7TT 10th-23rd October 2010