emi filter

Maria Maluca antenna by DL7JV - Horizontal HF 6-Band turning arranging emitter with 2 elements Maria Maluca

Off Center Fed Dipole - A K2GXT project documentation of how to homebrew and setup an off-center fed dipole

YJ0MM Online Log - Vanuatu - YJ 2010 - DXpedition info and online log

Indianapolis Repeater Association - Indiana's Premier Repeater Group An ARRL affiliated organization

ICQ Podcast - ICQ Podcast The home of the Premier Amateur Radio Podcast, podcasts, forum and Amateur Radio News and views.

ARVN Amateur Radio Video News - Documentary and seminar videos for and about Amateur Radio, on DVD and online. Some make excellent club meeting programs.

I0JXX - The I0JXX is an italian company that offers market their projects, also sells electronic products of high quality, both for Ham, both Broadcast and their accessories. VHF Antennas, mosfet power amplifiers, filters, insulators, power dividers, telescopic poles, antenna masts

Timewave - Sells leading-edge voice and digital communications products to the world-wide military, government, industrial, and amateur radio marketplaces. Bluetooth Remote Audio/PTT, Rig Controller with Audio & PTT , HamLinkUSB Rig Control, Noise filtersm antenna analyzers, Multimode Data Controller, TNC, Packet Radio Terminal Node Controller. USB2RS232

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

Filtronetics Inc - Maker of filters, oscillators, cristals Coils, Toroidal Inductions, Solenoids, Bifilar wound Solenoids, Trifilar Solenoids and Transformers Located in Kansas City, Missouri

Current Ham Radio Satellite Status - AMSAT Operational OSCAR Satellite Status Summary list Operational , semi-operational, non operational and future launch status of all current amateur radio satellite

KD5VC 250Hz Filter Mod - FT1000D 250Hz Filter Modification

Using Crystal Filters in FT-897D - Installing these filters is a big improvement in the quality of the rig of the Yaesu FT-897D

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

House of Batteries - House of Batteries is a master distributor and custom battery pack assembler for every major battery manufacturer in every battery chemistry for every electronic application

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

ADIF Master - ADIF Master is a highly user configurable Windows application for working with HAM radio logbooks. ADIF Master allows to convert any existing Cabrillo, TR, CT logs or a part of it into an ADIF file. Also you can use ADIF Master to open and modify existing ADIF logs using customizable filters, add, remove and modify ADIF tags and entries

Design 435/145 MHz diplexer filter - This example shows how SERENADE 8.7 can be used for help designing a contiguous lumped element diplexer by HA8ET

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

Low Pass Filters - Article explaining electronic network of low pass filters

Coaxial Stub Filters - A range of easy-to-build RFI filters by John Regnault, G4SWX

KI5YN QLF Filter - A microprocessor based interface designed to go between a standard Morse code key and a radio transmitter. The circuit receives a signal from the key, processes it, and re-transmits it to the radio.

The Classic Micro TO Keyer - K8CU builds a classic 1967 QST semiconductor project during the 40th anniversary year of the original project publication.