ferrite core bulan

Simple active antenna - This circuit shows an active antenna that can be used for AM, FM, and shortwave

Why active antennas aren't perfect - There have been various comments here regarding the effectiveness of active antennas

K9AY loop - K9AY is a loop developed in the early 1990's by American radio amateur Gary Breed

The Carpet loop indoor antenna  ^pop - High performance indoor shortwave antenna, the Carpet Loop II is an ideal step upward for the listener who wants something better than a random wire but doesn't want the expensive dice roll of an active antenna.

Ferrite antenna for LF - A ferrite antenna for Low Freqencies

The Carpet Loop - The Carpet Loop II is an inexpensive, easily built, high performance antenna that can work in almost all apartments.

Practical indoor antennas - Some practical indoor antennas that can be built by anyone

The Bird Feeder Antenna - A hidden antenna must be just that: hidden. So don't install an antenna, but something else. Lika a bird feeder.

T2FD The Forgotten Antenna  ^pop - "Some have called the T2FD a ""squashed rhombic"" antenna. It does bear some design similarities to the non resonant rhombic, but theoretically it is admittedly inferior. However, the T2FD performs well in a modest amount of space."

The Philco Repair Bench - Everything the antique Philco radio collector and restorer needs.

ARRL contest branch - ARRL contest calendar, scores, Forms and rules

Contest scores by dxwatch.com Priority listing - A searchable database containing user submitted scores for most contests. Information gathered from 3830 mailing list

DL1IAO Stefan - HF Radio Contesting and personal information: Latest scores, station tour, DL contest records and large photo section, maps and software

RC.N Home of Radio Contesting - Interactive home for radio contesters. Includes scores database, access to contester chat, forums, real-time posting and near-real-time news feed.

The National Contest Journal - The National Contest Journal, published bimonthly by ARRL, features articles by top contesters, letters, hints, statistics, scores, NA Sprint and QSO Parties

Ham Logs Online - Put your Ham Logs online, compare contest scores, send and receive electronic QSL requests and more. The place to see if you finally worked them!

W3MF John - General information page including contest scores, station pictures

Palomar Engineers - RFI Kit, ferrite cores, baluns, loop antennas, antenna tuners and various accessories

Dutch Frequency Database - More then 9000 frequency's about NATO , Police Firebrigades Ambulances Goverment Miletary Navy and Aircrafts.

Electronic Goldmine - Electronic components dealer, semiconductors, switches, leds, motors, solar energy, ferrites, toroids, capacitors, batteries, jacks and plugs, microphones, meters, power supplies, speakers, transformers, wire and more

QSLfactory.com - inkjet and printed custom colour QSLs

Audiocoreder - Audiocorder is a VOX program which allows your Macintosh to act as an audio recorder

Ferrite information - Ferrite Toroidal Cores, Magnetic Properties of Ferrite Materials, EMI - RFI Suppression Design Considerations, Ferrite Beads, Ferrites for RFI Ferrite Cores for RFI Suppression by CWS ByteMark

Toroid Pro - Designed by microwave engineers to provide filter, radio,microwave and Ham radio engineers with all relevant information of an inductor and core at his or her finger tips

Using ferrites for interference suppression - This tutorial is meant to shed some light on the use of ferrites, and also presents some comparative frequency domain measurements both to illustrate some of the points, and to give designers an idea of what they might expect in using and specifying a ferrite component