lightning protection sys

Trapped dipole for 80 and 40 m - This article explores a theoretical model for the losses of an 80m / 40m trapped inverted V dipole antenna system using a bootstrap coax trap, but does not examine the pattern of the antenna.

An antenna for 7MHz local contacts - This article describes the design of an antenna for local contacts on 7MHz, including a simple and efficient matching system that presents a 50 ohm load to the transceiver.

Simple HF Baluns for 50/75 ohm coax - Show diagrams, winding methods and tables of some 1:1 and 4:1 baluns for 1.8 - 30 MHz suitable for use up to 200W (400W peak) on systems using 50 or 75 ohm coaxial cable input where SWR should not exceed 1.6:1.

Phased vertical antennas - Phased vertical antenna system in french

G4IRX Beacon Monitoring - Beacon monitoring system by G4IRX setup at IO92JV

K5TIT - The Texas Interconnect Team - One of the premier D-Star systems in the USA

NM-ARTS - Amateur Radio Technical Society - A hardware and software project group to support learning and creation radio circuits, general electronics, and uProcessor control systems

Radio QTH practice exams - Call sign lookup system based on FCC database allow lookup for vanity call signs, practice exams and simple online qsl card creation

YouTube - W7NWH's D-STAR Videos - Videos by W7NWH including D-STAR system demos

Entegrity Wind - Wind Turbines - Entegrity wind systems is a leading manufacturer of commercial-scale wind turbines with installations worldwide.

TW Antennas - Portable multiband HF antennas. The Traveler provides 5 band, omni-directional communications in an easy-to-assemble package that requires no radial ground system or towers

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

Structural Components - Designer and supplier of tower reinforcement systems to the wireless industry.

D-StarUsers.org - D-star amateur radio systems, your source for d-star digital amateur radio. D-Stars users website

Alabama Repeater Link System, D-STAR - The enhancement of the Alabama Linked Repeater System is one project of the ARRL Alabama Section.

ARRL Experimenting with Icom D-Star Digital System - ARRL has embarked on a project to learn firsthand what D-Star digital technology has to offer and to assess its capabilities in a real-world Amateur Radio environment.

PAPA System - The PAPA Amateur Radio repeaters are located on some of the best hill tops in Southern California!

IRC D-STAR - Independent Radio Club D-STAR repeater system

K6MDD Mt Diablo D-Star - Mt. Diablo D-Star System is situated on the North peak of Mt. Diablo in California's East Bay 33 miles east of San Fransisco. At 3,600' the K6MDD System has excellent coverage of most of the Bay area !

BCFMCA D-STAR System - British Columbia Frequency Modulation Communications Association

Packet Radio on a Windows CE device made simple - How to use packet radio using the WindowsCE operating system

Kentronix - Dealer of electronic test equipment dealers since 1977 equipment manufactured by Tektronix, Hewlett Packard, General Radio, Dranetz, Bird, Fluke, ENI, ESI, Wavetek, Narda, Keithley, Weinschel, Microlab/FXR, Systron Donner, Kepco, Lambda

Number One Systems - Professional ready-to-use PCB design product.

D-StarLet - D-Star Radio Messaging System - A web-based text messaging application using D-Star digital data technology. Client server environment, where server can run linux windows or macos os with apache tomcat by Dean K. Gibson.

Vacuum tube liquid cooling system - This article describes an alternative to water as the cooling liquid for amateur radio vacuum tube power amplifiers. This cooling system is designed for adequate vacuum tube cooling, reasonable cost, and very low maintenance. By K8CU