three phase emi filter

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

The HB9CV antenna - Gain of this two element antenna is the same like gain of classical three element antenna of the YAGI type. Dimensions for 7-14-21-28 Mhz by pa3dlp

The Tiny 3 - Similar to Tiny 2 but this three element direct connect antenna utilizes a reflector and a director to achieve gain.

Phased Array Discussions - Interesting discussion about phased array antennas

A 2 Meter phased array antenna - Phased array Ground Planes antennas for 144 Mhz

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

Florence Amateur Radio Club - supports three repeaters in the Florence SC area. The Club Callsign, W4ULH authorized by the Federal Communications Commission.

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

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

FMI - FMI provides superior solutions in the design and manufacture of frequency control devices including Voltage Controlled Temperature Compensated Crystal Oscillators (VCTCXO), voltage controlled crystal oscillator (VCXO), Temperature Compensated Crystal Oscillators (TCXO), crystal clock oscillators, high temperature oscillators, surface mount and crystal oscillator products, phase locked sources and more.

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

P3-D Spacecraft: Overview - Overview of the Phase 3-D satellite project

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

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

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

Spectrum Analyzer Real-time FFT - Eight-channel Audio Spectrum Analyzer is a set of Real-Time Multi-Channel Gauges for investigation of data accepted from any ADC you will want or 16-, 24- and 32-bit ADC of sound card. WDM drivers support. FFT Spectrum Analysis, OscilloScope, Frequency counter, AC/DC voltmeter, Signal-to-Noise Ratio, Signal-to-Noise and Distortion, Spurious-Free Dynamic Range, Effective Number Of Bits, Total Harmonic Distortion, Inter-Modulation Distortion, Phase Shift. Special modes of dual-channel FFT spectral analysis: Separate channels spectra, Spectra of digital sum, difference, product of two signals, Spectrum of digital product of original signal and its fundamental, Spectrum of Real and Complex Transfer Function, Cross Spectrum. Standart weighing of spectra according IEC and CCIR. Oscilloscope modes (for dual-channel ADC) are: original signals, sum, difference, dependence of one channel on another, amplitude distribution of input signals.

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

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

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.