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Balun construction - problems with iron cores - Lots of information and measurements relating to HF baluns and transformers constructed using Iron Powder cores

Horn antenna for AO-40 by AA2TX - These notes provide the directions for constructing a Cardboard-box antenna for receiving the AMSAT OSCAR-40 satellite on 2.4 GHz (S-band.) It is constructed from two cardboard cartons, aluminum foil, and packing tape. No coax, connectors, or soldering is needed.

Antenna Measurement Theory - Introduction to Antenna Measurement by orbit /fr pdf file

Antenna Measurements - The electrical characteristics of an antenna that are of interest to obtain by direct measurement are the frequency at which the antenna is tuned, the gain and radiation pattern

Measuring antenna gain - Practical ways to get accurate results by Wayne Overbeck, N6NB

Measuring Tower Resonances - Some notes on measuring tower resonances by Rudy Severns, N6LF

Practical Wifi Antenna Measurement - This page describes a simple way to determine the main RF characteristics of a Wifi (IEEE802.11b/g wireless LAN) antenna.

Yagi-Uda Antenna Priority listing - The Yagi-Uda antenna, information on basic design, project and measure of Yagi-Uda antenna, include free repository/sample of beam antenna.

E-Z-Hook - Since 1956, E-Z-Hook has been manufacturing electronic test accessories used for test and measurement purposes throughout multiple industries. Test probes, multimeters, coax cables, adapters

ExTech - Electronic test and measurement; digital multimeters, clamp-ons, portable printers, meters and dataloggers.

Anritsu - Provides technology and solutions for the electronic test and measurement, optical, rf and microwave, wireless, wired, telecommunications. Make Frequency Counters, Antenna and spectrum analyzers, power meters, signal generators

Phase Matrix - Frequency Counter w/Selective Power Measurement, Microwave Sythesized Signal Generator

Agilent - The premier measurement company advancing electronics, communications, make signal generators,oscilloscopes, meters, multimeters, voltmeters, power analyzers

Deree Electrical - Specialized in manufacturing measurement instruments for more than 25 years. Clamp meter, digital multimeter, analog panel meter, thermometer, and led panel meter

EQS Systems - Test and measurement instrumentation, AC & DC power supplies, power sources and analyzers, data acquisition systems and boards

Link Instruments - Pc based test and measurement equipment and instrumentation: digital oscilloscope, logic analyzer and spectrum analyzer.

Gage Applied Technologies - Gage applied technologies designs and manufactures high-speed data acquisition systems, high-speed digitizers in pci / cpci / pxi or pc oscilloscopes, providing utmost measurement fidelity for high frequency signals.

Applied Instruments - Applied instruments manufactures test and measurement equipment for the broadband telecommunications industry. products include carrier generators, signal level meters, rf switches, spectrum analyzers and a return alignment system.

RadioMax - Allows any PC to improve the performance of radios and scanners, providing fully automated control of the radio (plus tape recorder if desired) allowing unattended scanning, logging, speech and tape recorder control. Works with AOR, DRAKE, Icom, Kenwood, Lowe, Optoelectronics, Radio Shack and Uniden.

Building a dummy load - Building a Dummy Load and Measuring Power Accurately by Ken, K4EAA

Oil filled dummy load - This project will demonstrate how to build a dummy load, and measure power correctly by AI4JI

Receivers sorted by IM3 - Sorted by Intermodulation. Best receiver first. This is a measure of how badly a close-spaced signal will trash your receiving with spurious signals or splatter sounds,

Noise measurements and reduction - K1SIX- Noise Measurement and Reduction Techniques

0-30MHZ RF Power Measurement - HF 100W LCD PIC16F877A SWR Meter at fox delta

N2PK Vector Network Analyzer - Homebrew VNA capable of both transmission and reflection measurements from 0.05 to 60 MHz