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Transmission Lines - Whenever you choose a coax feedline, the frequency of operation is a very important consideration. Over the operating bandwidth of the coax the VSWR is low, typically 1.2:1 or better. Insertion loss is also an important parameter. It is usually specified in dB/foot and is a linear relationship.

SWR: Maximum allowable VSWR - VSWR (voltage-standing-wave-ratio) represents the degree with which an antenna is "matched" to the system impedance. Most modern antennas do not require any tuning for optimum performance. VSWR is one of the easiest parameters to measure and VSWR meters are becoming very popular antenna installation tools

Yagi Element Mounting Considerations - One of the most important considerations when designing and building a Yagi antenna is the method used to attach the elements to a boom. This is true because the boom influences the electrical length of the elements. In this article JH Reisert explain with drawings techniques on mounting yagi antenna elements to a boom

A Magnetic Loop antenna for 7-21 mhz - If you find external wire antennas obtrusive for amateur radio or short wave listening, then this is the antenna for you, is just 1 meter diameter

Antenna Selection Made Easy - This page will help you answer important questions about antenna selection before you talk to a supplier. After reading this paper, you should be able to better determine the most important parameters you need to know for your antenna selection criteria.

Antenna Polarization notes - Antenna polarization is a very important consideration when choosing and installing an antenna. Most communications systems use either vertical, horizontal or circular polarization. Knowing the difference between polarizations and how to maximize their benefit is very important to the antenna user.

160 m DXCC - The largest and most up-to-date rankings of top-banders on the Internet.

Paducah Police Scanner - Paducah, Kentucky scanner stream website. Police and Fire online 24/7 for your listening pleasure

Sounds Sweet Communications Speakers - Speakers for Amateur Radio, 2-Way Radio, Shortwave and Scanner listening

Areas and squares - List and maps of European squares for each call area. You can use the list, to estimate the location, if you hear a station on the band who's locator you do not know.

VLF Time Broadcasts - VLF Time Signal Stations, Station List Compiled by William Hepburn, LWCA

ANTA - ATV - Web site dedicated to amateur television. List of repeaters, frequencies for ATV in France.

BATS homepage - BATS is an organization devoted to promoting the use of Amateur Televison throughout south central Wisconsin.

Recommended frequencies for digital modes - Active digital mode frequency list compiled by Jason Buchanan - N1SU

Topband - 160 meter Radio Propagation - Here you will find a variety of tools which will hopefully help you improve your chances of succeeding at Topband (160 meter) DX.

Las Vegas Scanner Frequencies - These are some of the frequencies that you can listen to when you are in Vegas with your radio scanner. Includes metro, police, fire dept.

Missouri/Kansas Scanner Radio - Provides comprehensive frequency listings for various public safety agencies and private organizations who operate across the Kansas and Missouri Region.

Pascall Electronics - Pascall's specialist RF & Microwave division specialise in components for radar, EW receivers, navigation & location equipment, communication and marine safety systems.

Electron Tube and Vacuum tube - The Electron Tube and Vacuum Tube Specialists. Electron tubes are our only business. Large inventory of of current and obsolete electron tubes.

Electron Tubes and Vacuum Tubes for Industry - Electron tube and vacuum tube stock-list with prices 4. Audio, broadcast and industrial tubes, triodes, tetrodes, thyratrons, ignitrons, vidicons and CRT's, microwave devices, nixies and receiving types + Bird RF devices and test equipment. Quality tubes at reasonable prices with many hard to find items available

The DX Handbook - Free huge and reliable BCL reference for shortwave enthusiasts. Includes a large schedule list diveded by bands. Is mainly in italian, but schedule listings are easy to understand. Edited by Enrico Oliva

WD6CNF DSP Filter - Audio Digital Filter, two bandpass filters, three notch filters, two noise filters graphical setting of filter center frequency and bandwidth Drag vertical lines on top of signal, Microphone input, speaker output Mono, 5 kHz bandwidth

Open-channel - A CB radio website aimed mainly at the UK market including help, tips, repairs, mic wiring, frequency charts, chat forum,rig doctor listing, mail order shops and much much more

RF Coaxial Connectors - RF coax(ial) connectors are a vital link in the radio spectrum. Coax connectors are often used to interface two units such as the antenna to a transmission line, a receiver or a transmitter. The proper choice of a coax connector will facilitate this interface.

About Lightning Protection - What You Should Know About Lightning Protection by Joseph H. Reisert