lightning protection sys

Quad Antenna System by Pfeiffer Maltese  ^pop - Excellent Quad Antenna projects for 40 20 17 12 10 and 6 meters band in this pdf file project by Pfeiffer Maltese

160m Helical Project - An helical antenna for 160 meters band by G0THS

80 meters spiral loop antenna - N4SPP 80 meters band spiral loop antenna based on SM0VPO design

The Coax Balun - Building balus with coax cables

4:1 Dual ferrite bead balun - The Dual-Ferrite-Bead 4:1 HF Balun, some preliminary measurements

G5RV - Radio comm. 1984 - Article taken from Radio Communications July 1984 by Louis Varney G5RV

Protection for Yagi elements - The following discussion about the Aluminum oxidization & protection of Yagi elements took place in the Moon-Net reflector.

QEX Ground System Experiments - N6LF series of experiments on ground systems for vertical antennas. That series of reports was converted, with some modifications, into a series fo seven articles in QEX magazine.

Homebrew Antenna Tuner - A simple T-network that can match any unbalanced antenna system by AA5TB

13m high elevated vertical - This article explores the performance of an unloaded elevated vertical, base matching and feed line as a multi-band HF antenna system.

G8RV Antenna - Antenna system resonant on 28.9, 24.9 21 and 1.8 Mhz by midstone amateur radio society

Cobra Ultralite Antenna - A multi-band wire-dipole using multi-conductor cable on each leg.

The Austin QRP Club - The A QRP Club is a small group of Amateur Radio enthusiasts who enjoy building, operating and (mostly) talking about Low Power radio communications, equipment and systems.

VE3VRW Macintosh Satellite Gateway - Listen to the Gateway Live on the internet Amateur Radio Operators in Southern Ontario and Western New York have been using the VE3VRW Satellite Gateway via the Toronto Area SSPBD Repeater System to make contacts on AO-27, UO-14, SO-67, Sunsat, SO-41, SO-50, Echo, Mir and ISS since it was first installed in 1997. MacDoppler tracks the FM UHF/VHF Amateur Radio satellites 24 hours a day, 7 days a week.

RPF Communications - Innovative and fast growing radio communications accessory company in the UK. Station protection, monitoring and control products, Microphone splitters and headsets

HI-Z Antennas - HF receiving systems and components, band pass filters, array controllers, HI-Z pre amplifiers

RF Systems - RF Systems develops and produces antennas and accessories for governmental and military organisations, shortwave and scanner listeners, radio amateurs, yachting circles and professional users of receiving and transmitting equipment.

1296 by KB2AH - Specialized 1296 Mhz Equipment, Circular Feeds, LNA, power amplifiers, Antenna systems, Test equipments, antenna mounting blocks

MegaPhase - MegaPhase designs, manufactures and sells coaxial cable assemblies to OEMs building advanced microwave and optical electronic systems, products include test cables, test adapters, flexible and semi-rigid cables used to connect system components inside a system, and coaxial connectors.

FT-817 DC Circuit Protection - A schematic for a DX circuit protection for the Yaesu FT-817, provides protection from the external power supply overvoltage by DL2LTO in german

Digital Oscilloscope and analyzer software - PC based mixed signal digital oscilloscope and analyzer software for BitScope. Runs on Windows, Linux or Mac OSX systems.

Shortwave Listeners Log System Priority listing - Free logging software for the Shortwave Listener. No database nonsense. Just your logs accurately tracked. saved and archived.

Friis-It NF for iPhone - Friis-It NF is the first iPhone OS based application that allows you to calculate noise figure, system sensitivity, and cascaded gain for an RF Receiver system

Ferrite in EMC applications - Electro-magnetic compatibility EMC issues arise when electronic systems interact in an un-desired way

TenTec Omni VI AGC modification - Modification leaves nearly all of the existing Omni agc circuitry intact, simply add an audio detector which modifies the delay characteristics of the original system by G3IXQ