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A sketch to read the input from the microphone and translate the dots and dashes into ASCII characters.

A vertical portable antenna system by W0SJS that will work on 40, 30, 20, 17 and 15 meters

Manufacturer of telecom structures and related accessories

Worked all states and awards net that has been operting since 1977. Eleven nets on four bands, working SSB, CW, RTTY and PSK.

The problem with making your own trapped HF antennas is usually getting the coaxial traps tuned to frequency.

Freeware CB DX logging program. Runs on Windows platform and require MS Access installed.

We sell antique radio tubes and antique tube radios We have over a thousand different radio tubes in stock. We also have a large stock of globe tubes.

A simple 40 meter CW transmitter, it sports full break-in operation and 250 mW of output power.

The QLF filter is a microprocessor based interface designed to go between a standard Morse code key and a radio transmitter

Mapping software which links a Garmin GPS receiver to your Macintosh. Includes Maidenhead grid squares and beam-pointing maps.

IC-8000 specifications and picture

On Track On Line provides information about Rail Travel and all facets of the hobbies of railroading and trains.

Outdoor equipment and electronics - handheld, base, mobile VHF, UHF and CB radios. Uniden emergency scanners. FRS and now GMRS 2-way radios.

Powerful antenna modeling tool using NEC 2 computing engine. Nec2 specifically provide users, either those experienced with the Nec2 processes, or for those who are neophytes but want to model their own antennas. Nec2Go uses a simplified process for defining the antenna structure and then providing view of the structure, plots (2D and 3D) and other significant data that is pertinent to the design. This simplified process uses an edit file with equations for all definitions.

A 10 meters band Slim Jim antenna project, made with a 450 Ohm slotted ribbon cable and secured on a 8 m fishing pole, by Steve G0KYA

List of latest published Weather Fax world wide schedule including frequencies and modes.

W4ZT used this antenna for Field Day and other portable applications. He built them for all bands between 160 meters and 6 meters. You can make them easily using whatever wire you have available and make the insulators from scrap plastic

Enabling IC 706 for 4 meter band modification in italian.

VOAProp shows you typical propagation for a given hour of the day during a given month. The propagation is shown as expected signal strengths to be received from different parts of the world, plotted on a world map. Windows freeware by G4ILO

Online calculators for toroid coil, air-core coil inductance, XL, XC, and more.

This HALO design is not ground dependent and can be mounted atop a section of PVC.

The HF ham bands can be mysterious. Some work at night, some during the day. Some seem to be good for long distance contacts while some are better for nearby contacts. Even worse, they change tremendously from hour to hour and day to day. An overview on operating on HF amateur radio bands

Some printable logbooks or logsheets, made to use whilst operating portable. Download free PDF files in landscape and portrait A4 Format.

YO Yagi Optimizer by K6STI is an old MSDOS based antenna modelling software that has been very popular among ham radio community. YO.exe is still today used to optimize Yagi Antennas.

Constructing a portable, high-gain antenna for _AO-40_ satellite operations presents unique challenges, particularly regarding mechanical stability and parabolic accuracy. This resource details the build of a 1.2-meter "brolly dish" antenna, utilizing a non-conducting fiberglass umbrella frame as its foundation. The project outlines a method for achieving a parabolic shape using stressed aluminum fly screen mesh, guided by practical geometry and a temporary dowel template. Key steps include selecting an appropriate umbrella with a suitable f/D ratio (ideally >0.25), removing the original fabric, and precisely cutting and attaching eight segments of fly screen to the struts to form the reflective surface. The construction process, which took approximately five hours for the author, _G6LVB_, resulted in a dish with an f/D of 0.27 (depth=270mm, diameter=1160mm, f=310mm). The article also describes a modification to a _TransSystem AIDC_ feed, incorporating a PCB reflector behind the dipole for easier mounting. Performance tests at a squint angle of 15 deg and a range of 50,000km yielded a signal-to-noise ratio of 33dB on the S2 beacon and 23dB for SSB signals, indicating strong reception. The author notes that the modified umbrella may not close fully without risking surface disfigurement.

Popular, versatile and easy to use Morse code training software written with the latest PC software technologies, and it is free with support. Guaranteed to increase your speed!

W6/PA0ZN CATV tuner based Spectrum Analyzer Building Project

An easy mod to make the 1st IF of the Icom IC-7600 accessible and connect to a cheap RTL SDR dongle by VE4NSA

CWQSO allows you to practice sending and receiving CW in a real QSO!

Videos by W7NWH including D-STAR system demos

An impedance transformer (9:1) to feed a high impedance long wire (~450 ohm), down to a 50 ohm unbalanced coaxial input.

Olivia MFSK digital communications are becoming popular in amateur radio because Olivia is one of the most robust methods of text keyboarding, that can perform superbly for long distance communications. Olivia frequencies, format and software

Big DUtch blog post about yaesu VX-8R include pictures and link to VX-8R manual

A PDF File to download and print, with a table of all menu options with values, default settings, description and a quick reference guide of the front panel menus

Closer pictures of Yaesu VX-150

Sometimes amateurs like to home-brew their power supplies instead of purchasing one off the shelf at any of the major ham radio retail dealers.

Sporadic-E clouds location and estimated MUF real time map by DXMAPS

Stacking 2 Meter Halo Antennas by Mike Fedler N6TWW

Lighting protection document by Glen E. Zook

HT Programming for the Absolute Beginner

An Arduino project to make it work as a KISS TNC

There is considerable confusion as to what exactly a multiband vertical antenna is. The confusion concerns the method of feed, how much mismatch one can expect, how many radials are required, how the particular antenna is built for multiband use, plus some other points.

Manufacturers of two-way radios (transceiver) in China.

Here you will find any useful downloads for IC-7000. Manuals, video clips, reviews, brochures

Compact and efficient magnetic loop antenna that cover from 40 to 10 meters project by G8ODE published by RSARS

A Half wave antenna has a high impedance feed point. This can be matched using a 1/4 wave stub matching section and converts the 40m vertical into an L-shaped 20m J-Pole antenna. The 300 ohm feeder used for this purpose must be kept away from the ground.

Examines the historical landscape of "boat anchor" amateur radio equipment manufacturers, focusing on the technical innovations and market dynamics that shaped the industry from the pre-WWII era through the transition to SSB. It details the origins and key product lines of prominent U.S. companies like _Collins Radio Company_, _Central Electronics_, and _Barker & Williamson_, highlighting their contributions to receiver and transmitter design. The resource contrasts early AM technology with the advent of SSB, explaining the circuit changes required in receivers and the complete rethinking needed for transmitters. It discusses the impact of military contracts on company survival and the eventual shift towards smaller, self-contained transceivers. Specific examples, such as the _Collins R-390/URR_ receiver and the _Central Electronics 100V/200V_ broadband transmitters, illustrate the engineering prowess and design philosophies of the era, offering insights into their operational characteristics and enduring appeal among collectors.

Hilberling GmbH based in Rendsburg Germany manufacturer of HF VHF Transceivers, rf power amplifiers, power combines, RF generators, power supplies, Antenna Diplexers and Triplexers

DVRA Hamfest, by Delaware Valley Radio Assoc.

NEC4WIN is a 32 bits commercial antenna simulation software based on MININEC3 developed by the Naval Ocean Systems Center in the 70s and 80s. It runs under Windows and can be used to simulate, analyze and optimize wire antennas, beams, verticals, etc. NEC4WIN has limitations. They are the same as Mininec3 on which the engine is based.