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Effect of tower coupling on an array - It's well known that a nearby tower can affect the performance of a vertical array, this article by NK7U describe measurements and prove interaction.

Some Aspects of the Balun Problem - Why all the mystery surrounding baluns ? To use or not to use baluns

Hentenna Applications - Plans and measurements to build the Hentenna antenna for HF bands and for the 6 meter band

Home-brew Antennas - Notes on homebrewing antennas by Chris G4CYA, from gamma matching, to phasing antennas, splitters and combiners, baluns and measuring techniques.

Steps to a successful Yagi build first time Priority listing - The purpose of this page is to help the professional and amateur builder alike gain some invaluable information to ensure a successful, first time build

Measuring Antenna System SWR - Have you measured the SWR at the antenna?

Linear Focus Parabolic Wifi Antenna - This antenna can be made in a couple of hours and involves a fair amount of measuring, cutting, bending, and bolting metal.

Hall County ARES Priority listing - Hall County ARES - The Hall County Amateur Radio Emergency Service has been organized to aid the public of Hall County and surrounding communities.

W4UA High Point Amateur Radio Club - Web site for the High Point Amateur Radio Club, serving High Point, NC and surrounding area communities.

W4AM Chattanooga Ham Radio Club - The Chattanooga Amateur Radio Club (CARC) provides Chattanooga, Tennessee and the surrounding areas a fully operational and coordinated voluntary noncommercial communications service.

ARI Ham Radio Insurance - Italy - Assicurazione per Radioamatori by ARI available to its members

RFTec - Coax Cables and Connectors, DC to 40 GHz RF cables & test cable assemblies, surge protectors, SMA connectors, adapters and termintators

Will Same - Manufacturer and exporter who have engaged in RF field , CATV , Telecom products field in Taiwan since 1990. Lightning Surge Protectors and arrestor, signal splitters, distribution amplifiers

Great Circle Distance Calculator - This online calculator computes the great circle distance between two points on the earth's surface

How Satellite Doppler Tracking Works - The Doppler Effect allows the distance between a satellite transmitting from space and a radio receiver on the ground to be measured by observing how the frequency received from the satellite transmitter changes as the satellite approaches, passes overhead, and moves away.

Kenwood TS-570D review - The Kenwood TS-570D(G) transceiver (I), by Thierry Lombry, ON4SKY

GAP Titan DX SWR Measurements - Gap Titan DX Antenna SWR Tests GAP Titan DX Antenna SWR Test

Dynamic range measurements - Comparison of FT-1000D FT-736R FT-817 FT-847 FT-897 IC-765 Orion TS-2000 Spectral purity of a continous carrier, of a SSB and CW signals

JefaTech - Coax Cables and RF connectors, mobile antennas, cantenna supplies and kits, wifi antennas and adapters, antenna mounts, surge protectors

EIO - Electronics surplus outlet in Redondo Beach, CA

Toronto Surplus - Toronto Surplus , antique radio, test equipment, rf parts

Texso Instruments - Distributor of test and measurement and calibration instruments and provider of NIST traceable ISO/IEC 17025 accredited calibration services. Texso sells insulated tools, multimeters, insulation testers, and much more.

National Test Equipment - New, used, & reconditioned electronic test & measurement equipment sales, rentals, & service. Agilent/HP Spectrum Analyzers, Tektronix Oscilloscopes, Fluke Calibrators, & much more.

Measuring Inductances with a Freqeuency Counter - This article also shows how you can make your own measurements that are as good as those possible with professional equipment

AC power meter - Measure the AC current flowing through your appliances