lightning protection sys

Radial ground system for verticals - Maximum-gain radial ground systems for vertical antennas by K3LC

Vertical phased Array - A SM3HXD vertical phased array antenna system

Folded dipole antenna by N4SPP - A quarter size cobra dipole antenna, a multiband dipole antenna for 40 to 10 meters basedn on original cobra dipole design but with a limited space by N4SPP

K9AY Receiving Loop Antenna System - K9AY 160M / 80M Receiving Loop Antenna System by K7SFN

3MA triband mobile antenna - 3 band mobile antenna - 10m full size wave/4 whip - quick tilt-down system for 20 and 15 m loading coil change by IZ7DJR

160m DX Mobile Aerial - M0VEY 160 m DX mobile antenna

The Mysterious Cobra - The Cobra antenna explained, article by Rick Littlefield - K1BQT

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

HF Antenna Coupling Techniques - Look at some of the various ways in which power can be delivered from a transmitter to a radiating system

HDSCS Hospital Disaster Support Communications System - A group of ham operators in Orange County, California that has supported over 30 hospitals since 1980. Includes information on how hams can provide hospital support in their own areas.

Tecadi - Mast systems and antenna accessories, hamrope(R) guy lines by Jurgen Simon DH5AB

TCI International - US global provider of innovative radio frequency (RF) solutions for spectrum monitoring and antenna applications. Specializes in Spectrum Monitoring, Communications Intelligence , HF/MF Broadcasting & Communication antenna systems.

Kathrein Inc - Manufacturer of professional antenna and filter systems for communications and broadcasting, serving commercial and governmental markets worldwide.

Amphenol - One of the largest manufacturers of interconnect products in the world. The Company designs, manufactures and markets electrical, electronic and fiber optic connectors, coaxial and flat-ribbon cable, and interconnect systems.

Atlanta Area APRS - Automatic Position Reporting System in Atlanta USA

A Two-Way Morse Practice Set - The system consists of a pair of Morse practice oscillators connected by a piece of two-conductor cable. Pressing the key on one unit produces a sound in both units by Peter Parker VK3YE -

QRP 1:1 Current-type Balun for Portable Use - A ferrite-loaded coaxial RF choke which just happens to yield the same result as a 1:1 current balun

Heavens Above - Live realtime satellite tracking system show current status of amateur radio satellites and more. Track ISS and all ham radio satellites.

Advanced Battery Systems - Specializes in providing portable power solutions. Custom battery pack assembly is primary function, but also distribute batteries for many battery manufacturers.

LoopHam Linux - Ham radio Distribution of the linux operating system that can be installed on and run from a dos system (msdos and win95/98 in dos mode) It include all AX25 ham needed packages and a small web server

MSYS - Un-official home of MSYS the multi-user BBS program for Packet Radio. This software is available for free use by all licensed radio amateurs.

Automatic Antenna Selection System - Antenna switch at K6XX

Ground Systems - Basic ground system functions, lightning and safety ground, RF return-path ground and induced ground currents

A Ham's Guide to RFI, Ferrites, Baluns, and Audio Interfacing - Understanding and solving RF interference problems using ferrite

NHRC-2 Based Repeater Controller - NHRC-2 Based Repeater Controller A perfect controller for a simple repeater or link, or portable/solar powered system.