filter rf

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.

Magnetic Loop antenna  ^pop - Why is an Magnetic Loop antenna so special, this antenna is picking only the magnetic part of the elektro magnetic radio wave. The big advantage of this antenna is that the electric interference from the big city have no influence on the received signal

1AT172 Franco - Personal page from Livorno Italy

QNEWS Ham Radio News - Daily updates to the weekly QNEWS Ham Radio News service in text realaudio and RF

Amateur Radio Club of Parker County - W5PC is an ARRL Special Services Club, ARES/RACES/SKYWARN in Weatherford, Parker County, TX

SV2BXC Spiros - SV2BXC Personal Amateur radio Web Page

HamFind - Search engine dedicated to amateur radio

Delaware County -Muncie - Indiana Police Scanner - Live Muncie Police Department - Indiana & Delaware County Indiana Sheriff Radio Scanner

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

Antenna Products - Antennas cover the RF spectrum from kilohertz to gigahertz and support countless mission critical military, air-sea navigation, ILS and voice-data communications applications.

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

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

Diamond Antenna  ^pop - Base station and repeater antennas, mobile antennas, ,multi-band HF antennas , handheld transceivers, receiving and scanner antennas, power meters, swr meters, power supplies, coaxial switches

MT63 HF mode - MT63 is a DSP based advanced HF mode for Amateur Radio, intended to provide high performance keyboard - to - keyboard conversational operation on HF bands under poor conditions

Hellschreiber beacon project - This web site describes a low power beacon system to be used for propagation and performance tests on the lower bands. The beacon offers CW (on-off keyed) modes and FSK modes; the traditional Morse ID mode, and Feld-Hell, another highly noise immune CW mode.

Dublin Frequencies  ^updated - Army, navy, police, ham frequency in Ireland and N. Ireland

Frequency Manager - Database system with 60000 frequencies, powerfull 3D MUF/LUF-propagtion software and full copntrol of several receivers

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

KM5KG network designer - Windows98 Program for RF Design

100W HF QRO linear amplifier - Based on Motorola MRF454, schematics and component list

ICOM CI-V Interface schematic - G3VFP schematic for the ICOM CI-V interface with PTT and CW Keying

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

RS232 Interface - This simple circuit is intended for older Kenwood radios and was presented in chapter 22 of the ARRL Handbook.

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