low pass audio filter

Low band antennas for 80 and 160m  ^pop - Antennae for the Low Bands, 80 and 160m

FVR Spitfire Array - The Powerpoint presentation below was given by Fred Hopengarten, K1VR, at the 1998 Dayton Hamvention Antenna Forum

Broadband receiving antenna matching - This article addresses the subject of obtaining the best signal transfer from an antenna to the typical 50-ohm receiver input over a wide frequency range, with emphasis on medium-wave (500 – 2000 kHz), encompassing the standard AM broadcast band and the 160-m amateur band.

Double 5 / 8 Flower Pot Antenna - The Double 5/8 is a natural extension of the Single 5/8 and uses a 5/8λ element for both the top and bottom radiators.

Petlowany Three-Band Burner Antenna - a simple, low-cost, trapless short vertical antenna which amazingly works on three HF bands (20, 15 and 10 meters)

Webtubes AntiqueTubes - Collectible,antique, Radio Tubes, special purpose and audio electron tubes and literature.

DX For Me - DX Cluster  ^updated - DXCluster which will allow mobile usage. Now able to manage filter per bands and mode, and to save configuration for specific DX or special event stations.

SPARC - SPARC club offer live repeater audio streaming from West Haven, CT USA. EchoIRLP link also available.

Bankstown Airport-Sydney, Australia  ^updated - Audio from Bankstown Airport monitored on 132.8 mhz. and 123.6 mhz.

Kenwood TS50 web control - This is an academical project to control my TS50 from the web.You can of course listen live real time audio. It is not 24 hours/day ONLINE, but click on the link to know if its connected.

RK3AF Aurora pages - VHF, ms, aurora, es, photos, audio, link, soft and more.

ManualMan - Now over 10,000 manuals for amateur, audio, and radio-related equipment available

Capitol Hill Monitors - Frequencies, links for scanners, email lists, online audio and more for Maryland, DC, and parts of Delaware and Virginia

IMAGINE QSL's Print Service - We design and print QSLs (simple,double,triple...), calendars, awards, directories... High quality at lower price

DXing.info - A comprehensive collection of DX information consisting of news, audio files, station profiles, equipment articles, discussion forum, DXpedition reports and logs for mediumwave, shortwave and FM DXers.

UI-Point 32 - Add-on for UI-View32 that allows you to plot APRS stations on Microsoft MapPoint 2002 maps.

DSP Controller - Bypass your sound card DSP prorgam to make transmitting much easier.

DataBase Toolkit by AOR - Windows freeware database containing frequencies, locations, and a small logging program capable or recording audio

KawAZ Azimuth angle calculation - KawAZ shows the azimuth angle of target location from your location by figures and image of compass

EchoLink - EchoLink allows Amateur Radio stations to communicate with one another over the Internet. The program allows worldwide connections to be made between stations, from computer to station, or from computer to computer. Fully Compatable with I-Link. Download from here.

MacPacSat - allows a Macintosh computer to communicate via packet radio with the amateur packet satellites currently in operation using the 'PACSAT' protocols

59+ CW  ^pop - Freeware Win32 application can be used for sending CW signal to the transceiver over a COM port or simply listening to Morse code on the speaker. The application is very easy to configure and will allow you to you to add new Morse characters set speed, tone, dash, dot, PTT line delay and other parameters. It is also possible to set shortcuts for call, QTH, name, RST and ANY other QSO field.

HAMIC - The Ham Intelligent Calculator - HAMIC, is a program designed to simplify a number of calculations commonly used by HAMs. It is designed for the HAM radio hobbyist, but may be useful to others as well. HAMIC has a simple to use, but powerful graphical interface that allows solving simple circuits such as resistors in series or parallel, or more complex circuits such as L networks or T networks. As well, other calculations such as SWR and reactance conversions are supported. Windows shareware.

Homebrew resources for wireless enthusiasts - PDF resources containing information on low cost ssb,am,cw circuits, which are useful for beginners.

BC210 Conversion for Noaa Satellites - Allow 137 Mhz range by Steve Warley