history of radio tubes

Hybrid Antennas - Antennas that use a combination of vertical and horizontal polarisation.

The Gain of the Axial-Mode Helix Antenna - by Dr. D.T. Emerson, National Radio Astronomy Observatory (NRAO++). Antenna Compendium Volume 4, pp 64-68, 1995, published by the ARRL.

Projects and Info Center - Antenna projects and info center by KP4AO, including The Optimized Wideband Antenna (OWA) Yagi and Skyhawk, a state-of-the-art trapless tribander

Marconi Museum - Wireless radios from all eras Operating ham station - W1FGM Rivals museum at ARRL Hq.

Charly Alpha Dx Group - Spanish web site of Charly Alpha Dx Group (Italy)

TI¤RHU Radio Club Heredia Costa Rica - TI¤RHU Radio Club Heredia Costa Rica with ROMEO HOTEL, DX group.

Alfa Tango Slovenia - Official Slovenian Alfa Tango web site

Super bowl earplugger - c.b. radio operators web page

Mongolia DX Association - Mongolian DX club with a lot of dx info and an online DX newsletter

Georgian Bay Amateur Radio Club - Owen Sound, Ontario Canada

San Marino - ARRSM - Associazione Radioamatori Repubblica di San Marino

Real-Time Internet Radio - All about live Internet Radio Broadcasting, including links to stations throughout the world and articles on the technologies that make Internet Radio possible.

FR Radio Lab - Magnetic Loop antennas, also availble in parts from japan

Heros Technology Ltd - HF Radio Preselectors,BCB filters,Low Pass filters,Band Pass filter

SDR-Kits.net - USB-Controlled Synthesizer for Softrock RXTX and Local Oscillator Applications

Linux DStar Development - The life and times of development of a Linux D-Star repeater and dplus node.

Meteors Q&A - very informative, answers questions like what is forward scatter, how does a meteor reflect radio waves ?

Satellite Tutorial - A good starting point to setup an Amateur Radio Satellite receiving system.

The DXZone Bookstore Priority listing - The DXZone Bookstore in association with amazon.com, here you can find the best titles for amateur radio world, including antenna construction.

Monitoring Times - Monitoring Times, SWL, BCL, montly reports, Broadcast band, satellite television, long-wave coverage, Reviews of new products and radio-related software.

Universal Radio  ^pop - Online Catalog. All about Radio comms, HF VHF Scanner CB radios, antennas and accessories

Antenna Visualization  ^updated - UNIX Application developped at the University of Texas Department of the Computer Sciences, permit to display the radiation pattern and the current magnitude.

GcmWin : Great Circle Map  ^pop - GCM is a freeware great circle map plotting software for windows, you can choose colours, scale, meridians, fields and or squares from the maidenhead locator system.

RadioControl  ^pop - 32-bit Windows software to control multiple radios simultaneously. Beside direct control, it also features frequency and memory management and various scan options. Supported radios range from AOR to Icom and WiNRADiO.

J-Track - With J-Track you can quickly and easily keep track of your favorite orbiting objects.