short wave

Double Bazooka Antenna performance - The Double Bazooka Dipole is a half wave dipole with an attempt at compensation of the reactance change that occurs around resonance for a half wave dipole.

Horizontal Half-wave Dipole above a Counterpoise - All antennas that are situated close to the ground are affected by that ground to some extent. This article explain effects and benefits of counterpoise.

End Fed Half Wave Antennas - An interesting article on end fed half wave antennas

Portable Half Wave Wire Antenna - A portable end fed HF antenna by W0CH

The Square Pole antenna - The SQUARE-Pole is a 1/2-wave dipole that has been bent into a square by WB2VUO

Horizontal Antennas above Real Ground - Antennas are influenced by the effect of the ground and by the type of conductors from which they are constructed. Effects of various types of grounds on a 1.825 MHz horizontal 0.5 wave dipole

Matching Waves, VSWR at work - When the radiation resistance (voltage to current ratio) of an antenna is the same value as the characteristic impedance of the transmission line (voltage to current ratio in the line), all of the electrical energy transmitted down the line is taken by the antenna and radiated into space in the form of a radio wave.

Earth Systems - In order to resonate at a particular frequency, an antenna needs to be at least one half wave length long. Antennas below a 1/2 wave are dependent on a ground system for resonance as well.

6 meters band Half Wave vertical - 1/2wave vertical antenna for the 6-meterband and a 5/8 ground plane antenna for 50 Mhz

Numbers Stations - About numbers stations, and their criptic transmissions, where to listen to them and some audio recording samples by fascinating shortwaves

Timewave - Sells leading-edge voice and digital communications products to the world-wide military, government, industrial, and amateur radio marketplaces. Bluetooth Remote Audio/PTT, Rig Controller with Audio & PTT , HamLinkUSB Rig Control, Noise filtersm antenna analyzers, Multimode Data Controller, TNC, Packet Radio Terminal Node Controller. USB2RS232

RFS - Radio Frequency Systems (Formerly Celwave, Cellwave, Cablewave),Wifi antennas, duplexers.

Spectrum Microwave Inc - Spectrum Microwave is a market leader in the world of RF & Microwave components and system

LP Technologies - A world leading developer of spectrum analyzers, RF system, test equipment and microwave solutions

Riding the Airwaves - By KE4WMF Bicycle Mobile Feature Article, CQ VHF February 1998

Sommerkamp FT 250 review - Sommerkamp FT 250 Shortwave Transceiver (YAESU FT 200)

The Shortwave Shop - Provide for the short wave listener, amateurs, local commercial community and business with a wide range of radio based services and products. Icom dealer

Anritsu Connection - Anritsu provides solutions for wired and wireless communication systems and operators. Anritsu products include wireless, optical, microwave/RF, and digital instruments, as well as Operations Support Systems and solutions for use during R&D, manufacturing, installation, and maintenance.

Fascinating Shortwaves - Article collection about shortwave listening, including number stations, tty fax reception samples, utility stations examples, navy and military morse metworks documention

Live Shortwave Radio Schedule - Dynamically generated shortwave radio schedule and world map. Updated hourly. Easy to read and use.

Integrated Engineering Software - Electromagnetic CAE simulation software for modeling and analysis. RF, Microwave & Antennas

FreqLoader: iPhone companion for the mobile ham - FreqLoader is the perfect iPhone/iPod Touch companion for amateur radio operators, monitoring enthusiasts, shortwave listeners and anyone with an interest in the air waves. Whether you're an active licensed ham or an avid scanner listener, FreqLoader will allow you to find what you're looking for, keep track of your stations, maintain complete logs and share your finds with friends, groups and the world.

Microwave RF Amplifier Design Tutorial - This tutorial will set out the design stages required to design a theoretical microwave amplifier

A 25 Watt Dummy Load - Dummy load described here can be used for up to 35 watts for short transmissions, and up to 25 watts for longer periods.

What's a diplexer? - It's a network that splits a signal to two or more loads, dependent on frequency. It is the simplest form of a multiplexer, which can split a signal into many different signal bands.