filter design

10 elements Yagi for 2 meters - Based on a design by JM1SZY for 50 MHz that he developed using YO

Optimised Six-Metre Yagi - Design for a 5 element beam on a 23 foot boom with an unusual combination of performance characteristics

80 meters wire antenna  ^pop - A reduced-size 80-meter antenna designed for small lots, portable use, and a fine companion for QRP

80m 4 element delta loop antenna - A four element delta loop antenna for the 80 meter band providing a forward gain of 6 dBi by F5VKM

W0KPH EH Antenna tests - Various tests and designs, with photos of home made EH Antennas,simple and networked, and also sone CAN Antennas.

K8CU Log Periodic Antenna - Plans, photos, electrical and mechanical design for this HF Log periodic antenna.

Stacked Yagi Antennas - Constructing and designing full size, single band stacked yagi antenna arrays

Summits on the Air (SOTA) - Summits on the Air is an exciting new award scheme for radio amateurs which encourages operation in mountainous and wilderness areas. The sceme is designed to grow into an international awards.

SATEDU PROJECT - SATEDU project, a 20Kg class microsatellite designed and managed by AMSAT-France, partially developped and built by students

Scanner feed tutorial - This tutorial is designed to help the average person get his scanner feed on the net pdf file

Valcom Fibreglass Whip Antennas - Manufacturer of Fibreglass Whip Antennas, Low and mediun Frequency, HF and VHF Antennas Specialized in the design and manufacturing of a full range of Beacon (MF), AM Broadcasting 540 - 1700 KHz, HF 1.7 to 30 MHz, VHF 30 to 156 MHz and UHF 200 to 500 MHz antennas.

HEX-BEAM - Traffie Technology - Hex-Beam antennas manufacturer, a new approach to beam design, using hexagonal array style, by Traffie Technology

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

Palstar - Receivers, Antenna Tuners and accessories, antenna analyzers, dummy loads, wattmeters, shortwave radio receivers, baluns, filters

Balun Designs LLC - Balun Designs wind high quality baluns and ununs for Amateur Radio and commercial applications based on the researched and tested designs of Dr. Jerry Sevick, W2FMI.

Six Meters FAQ - Faqs on six meters band, designed to help encourage hams to use and enjoy this band

The Very Small Array (VSA) - in Tenerife (Canary Islands). Designed to study fluctuations in the Cosmic Microwave Background (CMB) thought to originate from the period immediately following the big bang. Operated by Cambridge and Manchester Universities (UK).

AA Woodcrafts - Amateur radio call sign displays precision cut in wood. Being 18mm thick they are designed to stand on a desk or shelf.

QSLArt - Qsl card design and printing by ik6rum

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.

RX-PSK31 - Easy to use Audio Spectrum and PSK31 decoding program specially designed for SWL's who don't need TX or for anyone who just like to monitor PSK31 or analyse signals. Adjustable DSP and Spectrum settings for audio and frequency spectrum to set for best decoding of PSK31.

FT100 SuperControl - CAT control and logging software project especially developed for the YAESU FT-100 transceiver. The program is based on the design of FT847-SuperControl.

DXCluster for iPhone - 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