swr protection

Wire Antenna for 75 and 80 Meters - This article is about a wire antenna that covers the entire 3.5 to 4.0 MHz band with an SWR below 2:1 consists of two coupled dipoles, one resonant at about 3.5 MHz and one resonant at about 4 MHz, resulting in the low SWR

Log Periodic of Another Sort - A log periodic dipole array (LPDA) antenna design that offer continuous low SWR in 13-30MHz range

Tuning moxon antennas - More on the tuning of Moxons, getting the best F/B ratio and the lowest SWR, moving the feeding point and other constructions considerations

Matching Waves, VSWR at work - When the radiation resistance (voltage to current ratio) of an antenna is the same value as the characteristic impedance of the transmission line (voltage to current ratio in the line), all of the electrical energy transmitted down the line is taken by the antenna and radiated into space in the form of a radio wave.

Yagi antenna Q Factor - How you can calculate antenna Q factor for use in antenna quality evaluation instead of use of VSWR bandwidth.

Antenne verticale HF. - A vertical antenna project than can present low swr from 40 to 10 meters by using a balun in french

OK1DX Pavel - Personal web page with some electronic projects like rotator controler AVROT, SWR Mega meter and personal amateur radio information

MFJ Enterprises  ^pop - MFJ manufacturer of ham radio antenna products, antenna tuners, antenna analyzers, morse code & CW, SWR wattmeters, antenna accessories , power supplies, audio filters, TVI filters, baluns, coax switches and more

Lightning Protection International - LPI personnel have combined experience over many years in servicing customers throughout the world. Our experience covers projects in some of the most lightning prone areas.

Ningbo Zhongce Dftek Electronics - SWR meters, Power supplies, millivoltmeters, Oscilloscopes, signal generators, function generators China.

Latchways - fall protection systems - Latchways are the world leaders in fall protection and the manufacturers of the mansafe range of products for working at height.

Howell Communications, Inc. - Family owned and operated tower service company. Tower installation, Microwave and Broadcast Antenna Installation, Installation of Feed Lines, Ice Bridge Installation, Lightning Protection, Site Inspections, Alignment of Microwave Paths, Flash Testing, Sweep Testing, Tower Lighting and Relamping.

All-Risk Ham Radio Equipment Insurance Plan - Besides protection from lightning, this ARRL "All Risk" Ham Radio Equipment Insurance Plan also gives you the protection you need from loss or damage to your amateur station

1.5KW GU-43B HF Linear - by PA0FRI, 1.8 - 30 MHz, Input 50 ohm SWR <1.2:1

Efficient ground system - Article shows how to develop a good external ground system to complete your station’s protection.

About lightnening protection for Ham Radio Stations - An overview of Lightning Protection for Ham Radio Stations.

Why You Need Lightning Protection - The need for lightning protection, how a lightning protection system works

Lightning Protection Specifications - Materials, installation, inspections and certification

Lightning Protection Institute - A not-for-profit organizationn help locate an Installer, documentation, certifications

Fundamentals of Lightning Protection - National Lightning Safety Institute

Corrosion protection for tower structures. - Galvanic action. Corrosive effects of soil conductivity.

Very simple wattmet - A very simple QRP wattmeter project by SP5DDJ based on schematic of SWR meter developed and published by JA6HIC

Wifi VSWR Meter - A Wifi (V)SWR Meter to build yourself

G3TXQ SWR meter - Based on the N2PK design, this swr meter use a stockton directional coupler

N2PK SWR Meter - HF Forward Power & Return Loss (SWR) Meter