low pass audio filter

The Hustler 5BTV Conversion to 160 Meters - The prototype vertical is a modified Hustler 5BTV. The conversion allows the vertical to retain five-band operation by trading 80-meters for 160-meters

Homebrew Travel Antenna - This is a low cost homebrew two band travel antenna for 20 and 40 meters. It is based on the B&W Travel Antenna concept with a telescoping whip and a loading coil

K7EM 80m 4-Square Array - This array has been in use since 1989 The SWR from 3.5 to 3.9 is below 1.5:1

Testing EH Antennas - EH antenna tests report by Claudio Re, I1RFQ in pdf format

Barlow Wadley XCR-30 Home Page - A site all devoted to the first full coverage HF transistorized portable set of the world.

Hams for Christ Net - Fellowship of Christian Amateurs meeting M-F on 40 meters

Christian Amateur Radio Fellowship (CARF) - CARF combines the wonderful world of amateur radio with Christian fellowship and service.

This Week in Amateur Radio - Amateur Radio News and Information Bulletin Service delivered via satellite on AMC-7, transponder 5, 7.5 MHz wideband audio and over the internet in MP3 and RealAudio format

g3vdz/mm - maritime mobile station, with sound sample in audio wave files

Eurofrequence Dierking NF HF Technik - UFB Hamradio audio filters and more accessories

Nemal Electronics - Manufacturer of standard and custom electronic cable, connectors, cable assemblies, and patch panels for broadcast, audio, video, RF, microwave, and electronic control applications.

Laipac Technology Inc. - We are committed to constantly improving our solutions in areas of GPS System, GPS Receivers, GPS Antennas, GPS Dataloggers, RF Modules, Wireless Security Systems, Automatic Vehicle Location (AVL) for real time and passive tracking

50 Mhz Dx & Audio Files - Lage collection of 6 Meters and 2 meters QSOs, recorded in real audio format by OE3MWS

Internet Radio Linking Database - The purpose of this site is to allow users to be able to easily search an area and determine what users or linked systems are available for use there.

KC5ORO Echolink Internet Linking System - Echolink is software that allows amateur operators to communicate via the internet. It works by VoIP or Voice over IP technology

Cheap QSL'S - Low cost QSL cards for the Amateur and SWL

iSpectrum Analyzer - Macintosh audio spectrum analyzer that allows the user to view live audio in a standard frequency plot, a stereo oscilloscope view and a waterfall display

ISSTV - ISSTV is a freeware software for amateur radio that allow sstv connections via internet and radio waves

Radio QRP - The Art of Low Power - QRP is The Art of Low Power Radio where the challenge is to operate and/or build AM radio transmitters usinga bare minimum of components, money and construction skill.

IK4AUY Sergio - Advanced QRP Low Cost Mosfets HF Linear Amplifier with schematics, IMD, gain data and more. Six articles about amateur radio.

converting Philips FM-828E to 6 metres - conversion of low band VHF Philips FM-828 E band down to 6 metres

converting Philips FM-92 E to 6 metres - conversion of low band VHF Philips FM-92E to 6 metres

converting AWA RT-85 E band to 6 metres - conversion of low band VHF AWA RT-85 transceiver down to 6 metres.

converting AWA 25M-22 to 6 metres - conversion of low band VHF AWA 25M-22 carphone onto 6 metres.

converting AWA 25M-1 to 6 metres - conversion of low band VHF AWA 25M-1 carphone onto 6 metres.