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Tuner Baluns on Input - There is a common perception that placing a balun on the input of a tuner causes the balun to work better. The thought is the balun operates with a matched impedance and that reduces balun losses. It also is thought that moving the balun improves balance.

Two wire broadband HF dipole - This article describes the design and simulation of a two wire broadband dipole antenna for the HF band, using the software 4Nec2. The antenna is designed to operate in the full range 3-30 MHz

Lowering NVIS antennas - Lowering an NVIS or N.V.I.S. antenna very close to the ground enhances NVIS operation

SWR Table - Power loss table by SWR values

VSWR Reactive Power - Many antennas and antenna designers neglect the true cause of loss. The major problem using short antennas is the reactance, not the length

T Match efficiency estimator - This calculator estimates the efficiency of a T match tuner using a simple loss model.

9L5MS Sierra Leone - In close cooporation between the DAGOE Foundation, Mercy Ships, 4 Dutch and 1 Liberian radio amateur will run a Radio Project from Sierra Leone. We will be on-site in Freetown between March 15th and April 4th using the amateur radio callsign 9L5MS.

9W2PJU - Malaysian Ham Radio Station - amateur radio / ham radio full disclosure

9M2PJU - Amateur Radio from Malaysia - Amateur Radio Full Disclosure

WARC Westside Amateur Radio Club - Ham radio club in west Los Angeles

CE5BYU Radio Club Los Angeles - Radio Club Santa Maria de Los Angeles, Chile

Eagle 1st - US made, accessories for the RF laboratory; including Return Loss Bridges, high performance coaxial cable assemblies and test filters.

Ecoflex USA - Manufacture of the famous Ecoflex Low Loss Coaxial Cable Series.

Agilent - Spectrum analyzers - Agilent maker of Oscilloscopes, Analyzers, Meters - Spectrum Analyzer (Signal Analyzer)

Wulffert Technology LLC - Tower Light Monitor, Controller Alarm Systems for buildings, towers, antennas and airports

PSK31 Fundamentals and Setup - Background: The PSK31 philosophy, The QPSK mode, Varicode, Sound Card DSP Setup and Operating Tips

PSK31 Fundamentals - The PSK31 philosophy

HSMM Long Range WiFi - High Speed Multimedia Radio Introduction by ARRL Working Group Chairman

Handling of extremely strong signals K2 Mod - Makes reception at frequency of strong tx close by possible

Spek - Spek helps to analyse your audio files by showing their spectrogram. Spek supports all popular lossy and lossless audio file formats. Spek is free software available for Unix, Windows and Mac OS X.

Homemade Antenna Rotator Controller - The Antenna Rotator Controller is unique in that it senses, displays, and controls to the earth’s true magnetic field. The compass sensor, mounted in a waterproof enclosure, is attached to the mast and sends its signal to a microcontroller. By kg4jjh

Coax Cable Loss and Antenna Gain Calculator - Types of coax cable and line loss calculator, online coax-cable loss / antenna gain calculator

Glossary of Terms for Crystals - Common terms used referring to crystals

Bandpass Filters for Portable Usage - These are QRP rated 3 Pole Butterworth filters based on a design by K4VX, feature simplicity, almost no insertion loss, and reasonable rejection on the other ham bands.

Oscilloscope Tester - Circuit to assist in the setting-up and calibration of oscilloscopes