three phase emi filter

GI4SJQ CobWebb Antenna - GI4SJQ Cobwebb antenna plan with pictures and notes

Central Kentucky Amateur Radio Society - Our purpose is to have fun with Amateur Radio, to help others that wish to join the hobby, and to offer assistance to our community in times of eminent danger or disaster.

The Philadelphia Area Repeater Association - Founded in 1971 count over three hundred members, covers the entire Delaware Valley and beyond

Chemineer International Ltd - Soldering accessories and tools, masks, paste

Phase Matrix - Frequency Counter w/Selective Power Measurement, Microwave Sythesized Signal Generator

Agilent - The premier measurement company advancing electronics, communications, make signal generators,oscilloscopes, meters, multimeters, voltmeters, power analyzers

Hameg Instruments - Spectrum Analyzer, Oscilloscopes, EMI Measurement and Power Supplies German test equipment maker

Demis Web Map Server - A good online map service useful for ACARS map generation

Hellschreiber frequencies - Suggested frequencies for HELLSCHREIBER operation by the feldhell club

Hellscreiber sample - A sample picture of a Hellschreiber CQ call

Yaesu VX-2R technical supplement - The Yaesu VX-2R technical supplement manual delivered by radioamateur.eu in a 44 page pdf file

RadioWare - Products and books for the radio hobbist. Antennas, Coax cables, filters,Lightning Protection, Wire & Cable, Books

FilterCAD - A free computer aided design program to help users without special expertise in filter design to create filters using Linear Technology's monolithic filter ICs. With FilterCAD, you can design lowpass, highpass, bandpass and notch filters

AADE Filter32 - ADE Filter Design and analysis is a free for download windows program to design filters

AADE Filter Design - Freeware windows programs to design Butterworth, Chebyshev, Elliptic (Caur), Bessel, Legendre and Linear Phase low-pass, high-pass, band-Pass, and band-reject filters. Coupled Resonator band-pass filters

DXFile - Windows shareware logging program, offer several features like packet radio interface, web cluster, grid square, beaming directions, qsl manager lookup, dx spot filtering by F6GQK in french.

Tone Sound Frequency Sweep Generator - Generating of up to eight independent oscillatory processes per each channel with separate frequency, initial phase and amplitude controls.

TVi Basics - making filters - TV Interference filters, making TVI filters, coaxial filters to eliminate TV interferences caused by radio frequency

5th order High Pass VHF Filter - Sometimes many VHF-UHF modern transceivers have problems with BROADCAST Interference and CROSS-modulation from FM commercial broadcast stations this article shows a simple Batteworth HI-Pass VHF Filter to reduce this problem

Design RF Filter

Low Pass Filter Construction - Low Pass Filter Module Construction Manual

Tower down conductors prove relatively ineffective. - Exploring the need for tower down conductors

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

Ligthning: Protecting Towers - An interconnected concrete tower base can help the tower ground system.

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