type

High impedance baluns - Introduction with some background on balun types

Build a 4:1 Guanella Balun - Step-By-Step Construction of a 4:1 Current-Type Guanella Balun by W1CG

Common Mode Choke Theory - A common mode choke may be used to reduce a type of electrical noise known as common mode noise. Electro-magnetic interference (E.M.I.) in the circuit's environment is one source of electrical noise.

Types of multiband antennas - Types of multi-band antennas for the HF bands, from the horizontal end fed wire, to g5rv, log periodics, trap dipoles, vee beams and rhombic antennas.

Quad antenna calculator - To get the dimensions for your quad, all you have to do is type in the center frequency of the range where you talk, or the frequency you use most and then click the Calculate button.

Wlan antenna Waveguide type - Dimensioning a cantenna, theory of the waveguide antenna

Mobile 2.45Ghz antenna - A prototype 2.45ghz antenna for mobile use. This antenna has been u sed for surveying signal strength using a variety of free wlan tools.

DirectionalWaveguide - Seattle Wireless - Waveguide antenna is a type of DirectionalAntenna and is a modified waveguide. A waveguide is simply a tube, either rectangular or cylindrical in cross-section, that will carry a microwave radio signal with very low signal loss

PringlesCantenna - Seattle Wireless - The PringlesCantenna is an ultracheap Yagi-type directional antenna that can be built for under $10. The original Pringles Yagi was designed by Andrew Clap.

Wlan antenna Waveguide type - This antenna is constucted only of a cylindrical can and a N connector with centre tap lengthened

DK7EO - comments and reports - DK7EO ham radio blog

DL2EBX - Geofoxing - Ham radio blog on RDF fox hunting

W5HLH - The Future of radio - Exploring the future of radio, wireless, broadcasting, ham radio, and DX/shortwave listening. Edited by Harry Helms, W5HLH.

Kings Electronics - Manufacture a wide array of RF interconnect products for operation from 0 to 18 GHz, ranging in size from subminiature connectors to large, high voltage types

microHAM - Supply high quality accessories for your ham shack, including Band Decoders, various types of Antenna Switches, Antenna Stacking devices, special devices designed for the SO2R operator, USB Interfaces, Digital Mode Interfaces, Keyers and many others

Starline Electronics - Full-size Professional Circumaural (closed type) Stereo Headphone Monitor designed for studio use, swl and amateur radio.

Genesis Lamp - Sell all types of obstruction lighting. Lighting for your ham radio antenna tower. Genesis Lamp stocks a wide variety of replacement bulbs and specialty replacement light bulbs including: airport lighting and airport light bulbs, incandescent light bulbs and more

Psk31 - PSK31 is a digital communications mode which is intended for live keyboard-to-keyboard conversations, similar to radioteletype. Its data rate is 31.25 bauds (about 50 word-per-minute), and its narrow bandwidth (approximately 60 Hz at -26 dB) reduces its susceptibility to noise.

NOAA Space Weather Scales - The NOAA Space Weather Scales were introduced as a way to communicate to the general public the current and future space weather conditions and their possible effects on people and systems. The scales describe the environmental disturbances for three event types: geomagnetic storms, solar radiation storms, and radio blackouts.

Yaesu FT-857 description - The FT-857, the world's smallest HF/VHF/UHF mobile transceiver, provides base station-type performance from an ultra-compact package that's ideal for mobile or external battery portable work.

FFT Explorer - A free (GPL) Linux (Xwindows GUI-based) utility that performs spectral analysis on real-time data from a sound card or other source, and can analyze the spectra of various sound file types. It can also accept data from many kinds of applications in plain-text form by way of the "named pipe" feature of Linux

GeoAlert-Extreme Wizard - GeoAlert-Extreme Wizard maintains updated geophysical indices and displays the information in a friendly - at a glance - manner. GeoAlert-Extreme Wizard features a Global Maximum Usable Frequency, MUF, map that creates and manages predictions from the VOACAP engine. Displayed geophysical indices include: solar wind Bz component, speed and pressure, current WWV type indices and predicted solar flux, planetary A-Index and probability of major storms at middle latitudes for the next day.

LZ2US Amplifiers - LZ2US offers 3 types amplifiers for the serious VHF/UHF amateur. These amplifiers are very robust and in use by contest groups and EME stations all over the world. Every amplifier is custom made.

Install a PL-259 on an RG-8X  ^pop - A better way to install PL-259 connectors on RG-8X type coax by Dan Richardson, K6MHE

Prototype SWR meter for 2.45Ghz - Testing antenna's is a lot easier if you have a good swr meter this is a prototype of a design by g7eyt.