three phase emi filter

50 Mhz J-pole antenna - A project for a jpole antenna for the six meters band. Includes dimensions building instructions and pictures of the assemblig phases. In Italian

Coaxial-feed axiam mode helical antenna - Coaxial-feed axial mode hemispherical antenna is studied experimentally and theoretically

The 3-D Folded Loop Antenna - This article will introduce you to an antenna author call the 3-Dimensional Folded Loop. This antenna is the result of his continuing efforts to compact full-size antennas by folding and bending the elements. A one-wavelength loop that is reduced in height and width by being folded into three dimensions.

Four square phased verticals - TK5EDP 4 square phased vertical system in corse isl.

Shore Points Amateur Radio Club - Our Club Repeater System serves the Atlantic City Area on three Amatuer Bands

Peekskill - Cortlandt Amateur Radio Association - The Peekskill / Cortlandt Amateur Radio Association, Inc. (PCARA) is a Volunteer Non-Profit Community Service Organization Serving the Greater Peekskill / Cortlandt Area of Westchester and Putnam Counties in New York State. PCARA operates three voice repeaters in the Northern Westchester / Southern Putnam County region of New York State.

WB0GAH Three Rivers ARC

Pocono Amateur Radio Klub, Inc. - Northeastern pennsylvania's premiere amateur radio club

European PSK Club Priority listing - The European Phase Shift Keying Club (EPC) was to promote an interest in Amateur Radio to sponsor a series of contests, awards and badges based on the administrative geography of European and other countries by using the PSK mode(s).

EPC Club - 9A1EPC europeam phase shift keying club by The Croatian Digital Group

Micro908 Kit - A re-usable control & computing platform for antenna measurement, PSK31 digital modems, audio filtering, signal source & VFO, memory keyer by AMQRP

AO-7 Logbook Site - Resource for those who are actively uses the Amateur Radio Satellite AO-7

FT-847 on 70 Mhz - A further study of the spurious emissions from an FT-847 on 70MHz

EhoCW - CW Keyer software by F8EHO keyer and decoder functions, with interfaces with emitter/Receiver, memories, variables for call sign, mp3 and wav morse conversion, direct keyboard keying, joystick or serial interface for a morse key

Using Batteries - Batteries in fact and fiction. Batteries, Cells,Chemistry, Math and Radios

A low cost UHF/VHF duplexer - Duplexers for dual band radio are usually high pass filter and low pass filter combined in the same box. This circuit is a design within a cost of US$10.

The NVARC Ugly � Filter Project - Project to build sets of band pass transmitting filters for reducing the interference between HF transceivers operated in close proximity

Narrow Band-Pass filter for HF - Band-pass filters can be critical components in competitive stations. This setup may help put your station on the map.

Clean Up Your Signals with Band-Pass Filters - These inexpensive, easily built filters can be the buffer you need between the signals you want to hear and send and those you don’t!

Clean Up Your Signals with Band-Pass Filters part 2 - Part 2—You’re now much closer to saying goodbye to your unwanted signal problems!

Band-Pass Filters for HF Transceivers - Do your multiple-transmitter field day or contest efforts suffer from intrastation interference ?

K2TR Coax Stub Filters - Multi transmitter filters

Easy bandpass filters - Quick and easy bandpass filters for receiver input by George Dobbs G3RJV

40 meter QRP Transceiver - This semi-homebrew QRP (low power) CW transceiver is based on the ARK-40 transceiver kit, by S&S Engineering. With its built-in CW keyer and 5 watts of power, the basic ARK-40 transceiver is an outstanding 40 meter CW performer

Sci.Electronics : RFI/EMI Info - Dealing with Computer generated RFI/EMI by Daniel 9V1ZV