pi filter

10M Vertical Antenna - A vertical antenna plan for 10 meters band made with copper pipe and PVC pipe

1 X 1 Special Event Calls - A Special Event Call Sign is an amateur station call sign with a one-by-one call sign format that may be reserved for assignment to stations operating in conjunction with these short-term events.

K¤ARF Keeping Amateur Radio Fun - Keeping the fun in amateur radio with portable operating events and some contesting. Located in central Minnesota, U.S.A.

Steel City Amateur Radio Club - Steel City Amateur Radio Club Pittsburgh

IW1AU Gian Maria - My ham spirit, my publications and my home-made!

Radio Kits - Mailing list for people interested in building radio and electronics equipment from kits or from scratch. Frequent topics include shortwave radio receivers, construction techniques, and ham radio project.

RTX Pictures - Photos of many RTX from Yaesu Kenwood and Icom

HSCW ping sounds - You've heard MS pings, of course. But what does a HSCW ping sound like?

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

Grid Square maps  ^pop - Several grid square maps on the net, including world maps, regional maps and specific country grid square maps, collected by ve2pij

Pisgah Astronomical Research Institute - Non-profit public foundation dedicated to providing research and educational access to optical and radio astronomy. Located in Rosman, North Carolina.

Effelsberg Telescope - The world's largest fully steerable radio telescope, the 100 m antenna of Effelsberg in Bonn, Germany, operated since August 1972.

TK5JJ JJ Filippi - EME, MS, Tropo from the island of Corsica

K3PGP Experimenter's Corner - Covers experimental work from VLF through laser by K3PGP, one of the EME pioneers.

OE6IWG VHF DX from southern Austria - Walter describes his VHF Expeditions in Greece, some VHF logs online to search and lots of typical VHF homebrew stuff.

OZ1ALS contest results - Homepage of radio club oz1als, contest results, pictures etc

VHF+ Weak Signal Site of VE2PIJ - VHF+ Weak Signal Site

RigPix Database - Images and technical details of thousands of transceivers, cb radios, rotators, rf amplifiers scanners and accessories, by SM0OFV

Ten-Tec Jupiter CW copying and keyboard transmit - Part 2 - Ten-Tec Jupiter CW copying and keyboard transmit

The Aluminum Box Company - Free Shipping on CB Radios, Slipseat Boxes, Trucker Boxes, Galaxy, Connex, Cobra, Magnum CB, CB Radio Accessories, Satellite Radio, Alpine, and more from The Aluminum Box Company

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.

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

Yaesu FT-101 pics - Images of Yaesu FT 101