active antenna/cache

Active HF antenna - An active HF receiving antenna circuit by G7BCJ

Active Loop Converter for LF - Active Loop Converter for the LF Band by Lloyd Butler VK5BR originally published in Amateur Radio, July 2000)

Wellbrook ALA 1530 active magnetic loop review - Interesting review about active magnetic loop antenna Wellbrook ALA 1530 and 330S by ON4SKY

Active receiving antennas - An active antenna is sometimes used for receiving purposes in instances where a normal antenna would be impossible to accommodate in a physical sense.

Derby City Radioactives - The Derby City Radioactives is an organization of hobbyists and enthusiasts involved in multipule aspects of radio communications including CB and Ham (Amateur)radio,FRS/GMRS,Scanning,Shortwave Listening and the new Multi-Use Radio Service(MURS)

Contest LogChecker - Contest LogChecker is a set of contest tools for Microsoft Windows, combining advanced text editing with keyword highlighted, and the ease and flexibility of import, export, statistics and charting utilities. With LogChecker you can edit, fill in the log, check Cabrillo Format and Header, convert files from the most popular logging software to Cabrillo, print customizable files, calculate statistics and export logs to RTF, PDF or HTML for publishing. You can examine a log in many different ways by highly interactive methods. LogChecker includes a Master Callsign Database tool for managing databases, which have been generated from actual contest logs. Commercial

World Contest Station Database - Database of over 3000 active hf contest stations worldwide

9V1CW Singapore - Singapore active during PACC (11/12-Feb-2006)

S.M.R.C.C. - South manceshter radio and computer club, based in sale cheshire, an active radio and computing club with weekly talks

Radio Amateur Educational Society - Provide instruction to obtain certification, a forum for technical exchange and advancement of amateur radio, a mentor program to actively encourage our students in passing the amateur exam. Based in canada

GRARC Ham Radio club - The club is located in Dubuque Iowa, on the banks of the Mississippi River.We are active in the American Red Cross and various community events.

SWODXA - South West Ohio DX Association - SWODXA is comprised of active DX'ers and contesters with a deep passion for all aspects of Amateur Radi

Ham Radio Skypecasts - Look for ham radio skypecasts, you may find some active conferences now. Requires Skype.

Idiom Press - CW keyers, Logikey, and antenna rotator controll like rotor-ez, and active audio low pass filters.

Great Circles & QRA Locator Online - Interactive great circles and QRA Locator map

Recommended frequencies for digital modes - Active digital mode frequency list compiled by Jason Buchanan - N1SU

How operate Meteor Scatter - The Meteor Scatter tips and tricks described here are based upon more than 20 years of active MS operation

Albuquerque Transmitter Hunting - An active group of Amateur Radio operators who locate hidden transmitters for fun and in times of need, such as determining the source of interference to local repeater systems or individuals who use the Amateur Radio bands illegally.

Italian repeaters map - An interactive repeater map that uses google maps to display location of repaeter types available in Italy by Andrea IW0HOG

DK5AI Wolfgang - DK5AI amateur radio station active on EME and SSTV.

Adaptive Home Logic - Monitor / Control your home with APRS short text messages. Featuring Scheduling / Conditional Events, 2-way Speech, E-mail, file data, serial data, digital I/O, Sunrise/Sunset, natural language interface, interactive screen overlay scenes, logging + More

Smith Chart Software - SimSmith is a highly interactive, real time Smith chart graphing program. Circuits are constructed using drag-n-drop. Load files can be imported from the EZNEC and CocoaNEC antenna simulation software and from the AIM4170 and miniVNApro antenna analyzers. Circuits and load files can be of any size. Key Features: SimSmith is one of the few Smith chart packages which models transmission line losses. SimSmith also allows the description of circuit elements using algebraic equations. SimSmith has only one screen and allows the screen to be resized to increase workspace or readability.

FreqTweak - FreqTweak is a tool for FFT-based realtime audio spectral manipulation and display for Linux. It provides several algorithms for processing audio data in the frequency domain and a highly interactive GUI to manipulate the associated filters for each. It also provides high-resolution spectral displays in the form of scrolling-raster spectrograms and energy vs frequency plots displaying both pre- and post-processed spectra.

Metux SSTV radio fax solutions - Provide software and appliances for picture transmission via SSTV and radio fax. Software products are available on GNU/Linux and may be easily used for automatic (non-interactive) image transmissions and receival.

QRM and noise reduction Priority listing - You will find on these pages my experiences and results on antennas and local/non-local QRM/noise reduction. Using a broadband vertical active magnetic loop and a home made / designed broadband amplifier. Two vertical magnetic Alford loops are used in an array. Analog and Digital Signal Processing and a dual phase coherent Software Defined Radio (SDR) are used. By PA0SIM