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A home made project for a 3 to 12 MHz signal generator

A nice post on Make: on homebrewing a multiband antenna for amateur radio portable operations

Australia's largest range of Electronic Kits & Components In Stock for the Radio Experimenter, ATV, microwaves, HF Band pass filters

A simple PSK31/digital interface which can connect your transceiver to a PC soundcard for digital modes.

May 2015 Radcom Article on common-mode chokes that can be used for control cables, phone lines, but mostly on typical HF antenna systems. This article explain what common mode chokes does, why you meay need one, properties common mode chokes should have, how to build and measure performances.

Amplifier repair and conversion, specialize in converting HF amplifiers to operate as monoband amps on 50 MHz

Japanes press agency

Graph of the frequency response of some of the legendary microphones favoured by radio hams

An RF Field Strenght meter project by the Shefford & District Amateur Radio Society

The ÖVSV website provides extensive resources for Austrian radio amateurs, including details on its nine **Landesverbände** (regional sections) and the Austrian Military Radio Society (AMRS). It features information on licensing, legal frameworks, and **band plans** for both HF and VHF/UHF operations. The site also covers various amateur radio activities such as contests (HF, VHF/Microwave, Alpe-Adria, SOTA, ARDF), technical projects like WRAN, and educational content explaining what amateur radio is and how to become a licensed operator. Recent news items highlight events like the "Laa Funk '26" exhibition, the "OE5XLM" club station's participation in the CQ WW Contest, and the "International Marconi Day 2026" activation by "OE26M" from Küniglberg. The site lists upcoming events, including a 160m OE-Aktivitätsrunde, a seminar on Baluns/Ununs, and various club meetings and flea markets. Membership is facilitated through regional sections, and the site emphasizes amateur radio's role in independent communication during crises.

Here you will find information on how antennas behave when stacked G/T is an important figure-of-merit for the antenna's overall receive performance, because it balances forward gain (G) against received thermal noise (T).

An interesting article on guanella baluns that cover several aspects of homebrewing 1:1 and 4:1 current baluns by KN9B

Kennewick, Pasco Richland

On-line Log for XR0ZR DxPedition to JuanFernandez

A portable USB SO2R box made with Arduino

Here's a tale of early '70s vacuum tubes, mainly from the viewpoint of amateur radio.

Experiences with Loop antennas at G3YMC include some loop antenna tests and theory by G3LHZ

by SV2AEL

October 2000 Ham radio dx-pedition

The Minuteman Repeater Association is a non-profit communications organization serving the public in times of emergency.

NU-Tech is a powerful DSP platform to validate and real-time debug complex algorithms, simply relying on a common PC. Thanks to an easy plug-in architecture, the developer can write his own NUTSs (NU-Tech Satellites) in C++ and immediately plug them into the graphical interface design environment.

ScopeDSP analyzes sampled-data signals in the time and frequency domains. It can generate, read, write, window, and plot real and complex digital data signals.

Sporadic-E clouds location and estimated MUF real time map

Troposcatter, 50 MHz meteor scatter, ground gain for eme, radiation angle, by OZ1RH

An home made HF mobile multiband antenna inspired by the KM4IE HF 20 dollars antenna or the Texas Bugcatcher can work 75 to 15 meters band with an acceptable SWR.

Technical resource and information on improving ft1000 receiver performance

McMinn County Amateur Radio Club, Inc. (MCARC) Club Callsign KF4CFO.

The Northern Alberta Radio Club serves Edmonton, Alberta and area.

Kingston Amateur Radio Club Articles Dave Lawrence, VA3ORP

Concentrating on VHF DX, Aurora, Meteorscatter, TEP, Sporadic E, EME, VHF DXpeditions. Daily updates.

W1GHZ Palm Software, special-purpose contest logging program for the ARRL 10GHz Cumulative Contest.

CB Club north greece established in 1982

A fully equipped amateur radio mobile radio shack by VE6AB

A led electroluminescent radio receiver

Supplying over 2000 different vacuum tube types, valves, grid caps, sockets and capacitors. It is easy for Antique collectors, Ham radio operators, audio enthusiasts, broadcast enthusiasts and amateur radio hobbyists to buy, sell and trade vacuum tubes, electron tubes, audio tubes, valves, grid caps, sockets and capacitors

The ATV User's Group is a subgroup of the Auckland VHF Group, Club call ZL1BQ, compromising of persons interested in the transmission and reception of Amateur Television

Here are 10 tips and truisms that every ham should know about antennas, by W20QI

Ham satellites, 50 MHz, my hobbies, links.

This resource presents a domain name for sale, specifically _Kl7aa.com_, for $995, with an option for a 24-month payment plan at $41.46 per month. The page details the purchasing process, including immediate domain access, zero percent financing, and secure shopping. It also outlines the transfer process to other registrars like _GoDaddy_, clarifies what is included with the domain purchase (only the domain name, not hosting or web design), and explains how to maintain WhoIs privacy protection. The content includes testimonials from buyers like Dann Berg and Greg Shepard, highlighting smooth transactions and quick domain delivery. It also provides information on HugeDomains' 30-day money-back guarantee and frequently asked questions regarding domain transfers, access post-purchase, and payment plans. The page emphasizes the importance of a web address and lists other similar domains for sale, such as _Kl35.com_, alongside quick stats about the domain's length and structure.

Building the MFJ Cub QRP transceiver kit for 20 meters band by G4ILO

N9TEW is supplier of vacuum tubes for ham,audio & antique radio purposes.

Radios, Antennas & More dealer from Texas USA

The past and future of the Sun's solar cycle and possible impact on the Earth's climate.

Home page of the first hamradio club created in Northen Greece.

Xenia, Ohio Ham radio club, formed because of the Tornado of 1974.

CQ Milano, the dx NewsLetter edited by Sezione A.R.I. Milano.

Irish ham and Vhf radio info. Logs and maps worked, no excuses, this is mainly a VHF site

We are the premier Amateur Radio Club in the Edinburgh area, since our formation in 1984 we have done much to raise the profile of our hobby in the area.

FM & SWL, broadcasting, media, FMDX,frequency lists, ham adio

Do you want to measure antenna impedance at resonance? With this Antenna Scope, you have a simple RF Bridge for getting started in an exciting part of Ham Radio, building your own Antennas that work well