lightning protection sys

End Fed Half Wave Antennas - An interesting article on end fed half wave antennas

Earth Systems - In order to resonate at a particular frequency, an antenna needs to be at least one half wave length long. Antennas below a 1/2 wave are dependent on a ground system for resonance as well.

D-Star video demonstration - KE7FTE, N7QQU and W9ERT show us the "drag and drop" flexibility of the Icom D-STAR System.

Argent Data Systems - OpenTracker+ and Tracker2 series APRS devices for real-time vehicle tracking, weather monitoring, and remote telemetry, aprs tracker manufacturer.

Kvazar - Manufacturer of photovoltaic cells, solar modules and solar systems in Ukraine

DMsolar - Solar Panels, Grid Tie Systems, Solar Power Kits, Solar Cells and more. DMsolar carries solar energy products for your needs.

Wind Turbine Industries - Sole manufacturer of the Jacobs Wind Systems

QHtenna - The QHtenna Turnstyle antenna system offers horizontal omni-directional antennas for the Ham frequencies in the VHF/UHF range of 50 Mhz to 432 Mhz. The Crossed Field Antenna" (CFA) by QHtenna offers a small antenna for limited space, maritime mobile, and seasonal DX work.

Spectrum Microwave Inc - Spectrum Microwave is a market leader in the world of RF & Microwave components and system

Wire Harness Assemblies - Printed Circuit Board, Custom Overmold Cable Assembly, Box Build, System Integration, Sheet Metal

How the Hellschreiber works - Hellschreiber is a teleprinting system based on low-resolution character-level facsimile. Learn how it works with animations and graphics.

Radio Direction Finding - introduction - History of Radio Direction Finding, performance and limitation of RDF Systems, RDF for non professional use

KQ2H Repeater live stream - Repeater system in the New York metro area Service provided by W2LIE.NET

Frequenzdatenbank.de - Frequency database for Germany. Emergency services, aircrafts, radio and paging system with over 2000 frequencies from all over Germany.

4ATV.com - Amateur TV transmitters and receivers for ham operators, wireless cameras, ham antennas, 2.4 1.2 900 Mhz systems

South Midlands Communications Ltd - Antenna support masts, towers and HF antennas, pneumatic masts, push-up masts, antenna masts and mounts, poles, antenna systems, dipoles, portable, nvis antennas

Adur Communications - Specialist in the design and supply of Radio Communications Equipment and Systems. West Sussex England. Antennas, traps and baluns inline isolators, Outbacker Antennas, Mobile Mounts and Accessories

Hope Valley Radio - We supply and maintain radio systems. Anyone that requires a radio communications system can be confident that we can supply and maintain a scheme that is second to none

D-STAR Gateway Software - ICOM software to interconnect D-Star systems

CWCom - CWCom is a morse code chat progam for Windows and NT operating systems. You can use CWCom to transmit and receive morse code and text messages over a LAN or across the internet! CWCom can translate morse code to text and text to morse code or flashing light, so you don't have to know morse code to use it.

Oscilloscope Software by Tektronix - Tektronix oscilloscope software helps automate and speed up the testing and evaluation of challenging system designs. Choose from over 30 software packages

Making the right connection - The humble connector plays a very important role in the communications chain. It can make or break your system - and often does.

Oil filled dummy load - This project will demonstrate how to build a dummy load, and measure power correctly by AI4JI

Lightning Detector - A project to homebrew a Lightning Detector

Batlabs - Motorola two way systems technical documents