band pass filter

Understanding the Hexbeam - G3TXQ pages focuses on understanding the HexBeam antennas. Basics, dimensions, multi band issues, antenna modeling.

UN DX Contest 2010 - The Kazakhstan Federation of Radio sport and Radio amateur (KFRR) and Ministry of Tourism and Sport of the Republic of Kazakhstan are announcing the First UN DX CONTEST All world-wide radio amateurs having the amateur radio licence are invited to participation. Contest period: 12.00 UTC 22 May – 12.00 UTC 23 May 2010 Bands: 160m, 80m, 40m, 20m, 15m, 10m. Modes: CW and SSB

144 MHz Beaconlist - List of beacons operating on 2 meters band

ARRL: US frequencies allocation - Transmitter power limits and frequencies allocation by band

IARU Region 1 Bandplan - IARU REGION 1 band plan

DARC Ortsverband Duisburg - DARC DOK L16 Duisburg-Huckingen Ham Radio Club

DARC Ortsverband Dusseldorf R01 - Deutscher Amateur Radio Club - Ortsverband Düsseldorf, R01

Roadrunners Microwave Group - Organized to promote operation on the amateur bands above 420 MHz

The San Diego Six Shooters ham radio club Priority listing - The San Diego Six SHooters Amateur Radio Club, established in April 2001, is dedicated to promoting all modes of operation on the Six Meter Amateur Radio Band.

EI8IC's HF Contest Resource Site - This HF contesting resource site has a large range of articles, tips and techniques, contest writeups, bandplans, links, and a fine range of Ham maps.

Gizmotchy Antennas - The Gizmotchy high performance horizontal and vertical beam antenna for 2/6/10/11 meter bands

Hi-Q Antennas - HF Ham Radio mobile operation antennas manufacturer, W6HIQ, HA5CMG, VE7BOC, HF mobile antennas, screwdriver antenna, coils and filters.

Magic Band Network - 50 MHz information on antennas, beacons, and frequencies provided by PA4PA

Six Meters: An Introduction - An extensive introduction to 50 mhz band, (6 meters)By Dave Finley N1IRZ, appeared in QRPp Winter 2000

The Four Metres Web Site - A website dedicated to 70 MHz Band

Long Wave Radio - Dedicated to 136 Khz band by G3YXM includes news, links and software useful for LF working.

VHF UHF Operating index - RAC - VHF UHF SHF Bandplans, repeaters, satellites and many related info by RAC

KB2VGH's VHF pages - Bandplans, Beacons and many useful info on VHF operations

PropView - PropView is a free application that uses the included VOACAP, ICEPAC, and IONCAP engines to graphically display band openings between two locations over a specified 24 hour period. It can also build schedules for the IARU/HF beacon network and automatically QSY your transceiver to monitor each scheduled beacon.

EchoFilter - EchoFilter uses the soundcard of a PC to process income audio signals in real-time. The narrow filter bandwidth allow the extraction signals and sounds from the audio signal that may normally be close to inaudible. It is intended for radio HAMS, hobbyists, researchers, scientists and students in the DSP field.

SpotCollector  ^updated - A free application that captures DX and WWV spots from up to 5 internet clusters and a local packet cluster. DX Spots are merged and stored in a Spot Database on your PC, enabling you to monitor, sort, and filter them in real time; known LotW participants are highlighted, as are needed stations. WWV spots are plotted to show SFI, A, and K over the last solar revolution.

Cluster monitor - Cluster monitor is a tool for web and telnet clusters monitoring. The program shows spot history, the latest spots are shown in a separate window with full information about the DX, announcements, WWV propagation, and full sorting and filtering capability. Full support for AALog and AAVoice by RZ4AG, DXAtlas by VE3NEA. Integrated dial-up support.

DXKeeper - DXKeeper is a free application that logs QSOs, tracks award status, generates QSL cards & labels, addresses envelopes, uploads QSOs to eQSL.cc and LotW, and downloads progress info from eQSL.cc and LotW. It can reference the RAC, Hamcall, and QRZ callbooks as well as the QRZ.com web site to fill in data when logging, or to update already-logged QSOs. DXKeeper automatically interoperates with all members of the freeware DXLab Suite, including Commander (transceiver control and bandspread for Alinco, Elecraft, FlexRadio, Icom, Kachina, Kenwood, TenTec, Yaesu), DXView (world map, rotator control), WinWarbler (PSK, RTTY, CW, Phone) and SpotCollector (DX and WWV spots). It also interoperates with MMTTY, MMVARI, MMSSTV, MultiPSK, MixW, DX Atlas, and Ham Radio Deluxe.

SeaTTY RTTY/NAVTEX decoder - Program to receive weather reports and navigational warnings transmitted on longwave and shortwave bands in RTTY and NAVTEX modes. None additional hardware is required - your need only receiver and computer with a sound card.

DXCluster for iPhone  ^updated - DXCluster let you know in real time who is on the frequencies and where it was listened the last time. It let you create filters to only see which frequency/CQ Zone/ITU Zone and/or Country and after that you can have an alarm corresponding to a specific Zone or a specific country that raise a popup