three phase emi filter

3 Element Antenna for 28 Mhz  ^pop - The DF9CY three-element antenna for 28 MHz by Christoph Petermann DF9CY

Turkey - TRAC - Telsiz Radyo Amatorleri Cemiyeti

TA7KT Club - Telsiz Radyo Amat¸rleri Cemiyeti Kayseri ?ubesi web sayfas.TURKEY

Portugal - REP - Rede dos Emissores Portugueses

K-Com - comprehensive line of products for rejection of Radio Frequency Interference (RFI) to telephone equipment.

Array Solutions - WX0B - Stacking and phasing HF and 6m arrays antenna switches and contesting devices. Custom low band antenna arrays, bandpass filters,commercial/Mil STd filters,microwave components, commercial broadcast filters.

Poly Phaser - Data, RF, video protectors coax combiner protectors, grounding Items

HD Communications - Rf Connectors,RF Amplifiers,RF Filters,HF cable and accesories. Tower hardware valves and tubes

Kiwa - Filters and performance upgrades for many receivers

Vectronics - Antennas, Filters, accessories, wattmeters, tuners and amplifiers.

Autek Research - Autek Research make three models of RF Analysts, power and swr meters

IARU HST Championships - Official page of the IARU High Speed Telegraphy Championships

Morse Code tutorial - Short reference to morse code

Italian airport frequencies  ^updated - List of italian airport frequencies

All Spectrum Electronics - Hobby kits and electronics, semiconductors, components, batteries, ham radio gear and more

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

Radio Bahamas, ZNS - Info about the three AM BCB stations of ZNS (Zed-N-S), Radio Bahamas.

Spectran - Program designed to do spectral analysis and real-time audio filtering on reception of audio signals for EME, VLF, SETI applications. Offer support for MTHELL, QRSS, DFCW, NDB, WSJT by I2PHD

PLL2 - 2nd Order phase locked loop design for passive and active circuits. Bode plot, step response, design parameters

Tunekit - Filter Tuning Kit for Windows is a electronic filter synthesis program and a practical filter tuning aid for actually designing and building a working filter

TVI and BCI Filters - TVI and BCI bandpass and bandstop filters in SMD technique. Schematics and images.

Lowpass filter for 5MHz - The following lowpass filter was built using the tables in the arrl manual, it is a 5 section one and seems to work ok

KI5YN QLF Filter - The QLF filter is a microprocessor based interface designed to go between a standard Morse code key and a radio transmitter

SSB and CW Filter - A pdf file with schematics of an ssb and cw filter AF amplifier

EMI Calculator - Does your Amateur Radio system comply to the EMI rules ? (German values implemented)