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Sleeve baluns are normally used at VHF and higher. As a general rule, they are not practical at HF. The balun can be inverted and used as a skirt to form part of the antenna element

Circuit Diagram and Construction of the Bartling RX-40 Joachim Munch DF4ZS

Comments received from QRP-L members concerning their experiences with GAP antennas.

Logipic is a PIC Programer for windows

Windows Magnetic Loop antenna design software by DG0KW in Detusch

The RasHAWK team has used a Raspberry Pi as the basis for a networked RF sensor capable of supporting spectrum monitoring, signal intercept and direction finding (DF) operations.

Founded in 1946 in the UK, the ISWL is Global. We cater for Licensed Amateurs and all types of Shortwave Listeners. Offer a comprehensive awards programme and run a very efficient QSL Bureau.

conversion of low band VHF AWA 25M-22 carphone onto 6 metres.

At LCWO you can learn Morse telegraphy (CW) online in your browser, use Koch Method, compare your results with others, speed practice and more

Specifiation at rigreference.com about Yaesu VX-8R/E

Cabrillo2Adif A software for converting the radio logs from Cabrillo to Adif log format (for Mac OS X)

A project for a 50 MHz moxon rectangle antenna

The Yaesu FL2100Z is a HF linear amplifier rated for 1200W PEP input, and using two 572B triode tubes. This article explores the recommended operating conditions, and alternatives.

DXpeditions to Mauritius Island from 1996 till today. Island infos, log-search, contry infos and many more

A dipole antenna for 7 MHz support for this antenna is fiberglass military mast

Oklahoma's Largest Amateur Radio Hamfest

In this PDF article Zack Lau describe how to homebrew a four element yagi beam antenna for 50 MHz band, including how to build mounting blocks and tubing clamps to hold elements.

A home made project, scan and monitor the 2.4 GHz band using a common MMDS downconverter.

SSTV, pictures, home brew from sweden

Amateur Radioastronomy in Poland

This is an internet resource for those interested in guitar amplifiers, vacuum tubes, and design tools such as SPICE modelling.

Exams, Club and Other Information, bullettins, classes and trainings

Resources for amateur radio astronomers, teachers, and students.

Extend the range of wireless network or connect to other wireless networks in neighborhood with your own wifi antenna.

Over 130 years after its inception, Morse Code remains a fundamental skill for many amateur radio operators, enabling efficient QRP operations, DXing, and contesting. This resource provides an in-depth look at the **Koch Method** of Morse training, a widely adopted technique that emphasizes high-speed character recognition from the outset. It details how this method can significantly accelerate proficiency, moving beyond traditional, slower learning approaches. The site also delves into the rich history of amateur radio, presenting articles such as "Radio on the Rio," which chronicles local ham activity in Socorro, New Mexico. Another piece, "The Russian Woodpecker," recounts the Cold War-era efforts of hams to counter Soviet over-the-horizon radar interference on the HF bands. Furthermore, the resource explores the fascinating intersection of ham radio and radio astronomy, highlighting the direct lineage between amateur experimentation and the development of modern radio telescopes like the **Very Large Array (VLA)**. It also includes an introduction to the 6-meter band, often called "The Magic Band," detailing its unique propagation characteristics and suitability for no-code licensees seeking long-distance contacts.

PalmProp is a software for PalmOs dedicated to the forcast of HF radiowave propagation by f5hla

Why all the mystery surrounding baluns ? To use or not to use baluns

Construction of attenuator, suitable for fox hunts at 144mhz

A K9AY loop antenna project done with Far Circuits pc boards for the antenna switch and bandpass filter and preamp by K7SFN

TenTec 1208CY 10/50 MHz Transverter modification by DF9CY

Mounting on Roof or at Ground Level? Why ground plane antenna works better at lower level.

FREE ham radio newsletter The K9YA Telegraph is in full-color and delivered to your computer each month as a PDF.

A list of free to download CPS Motorola radios programming software. GM3188, GM3688, GP3188, cp1600 cp1300 and some more.

The Findlay Radio Club was incorporated as a non-profit organization in the State of Ohio on June 9, 1956.

An article at NFARL web site about differences in setting up a half-square antenna versus a Loop Skywire by W4QO

The California Polytechnic State University Amateur (Ham) Radio Club (CPARC) has a long tradition of communications service on campus and in the community of San Luis Obispo. The club was founded in 1947, making the Cal Poly Amateur Radio Club the second oldest club on campus

A Compact and efficient multiband beam antenna based on a Modified W8JK Array by K5LJ

Over 26 years of public service in Brandon FL

based on an FT-1000MP Reflector discussion with Bill Heinzinger, W9OL, 15/16 November 2002

Flash crystals, Feakin' beacon keyer, beacon attenuator

This page contains a map of Amateur Radio Russian Prefixes.

Article by VU2GT about VHF antennas, how to evaluate performances and models.

Repairt a Heathkit SB-220 Linear Amplifier with a bad Plate Voltage meter

Chart showing how SWR effects how much power you actually radiate from your antenna.

Heathkit Manuals

Amateur Radio operators, volunteers for Emergency Service, in Portland, Oregon, and other suburban cities and towns in Multnomah County

The Packet Radio beginners guide to packet radio operating by Buck Rogers K4ABT

RS41 Tracker is a software running on Windows that it is able to decode telemetries generated by Vaisala RS41 radiosondes. Used with a FM radio receiver it allows to display radiosonde positions on a map.

SARA provides emergency communications for the City of Saratoga as well as for community events.