four square

Three or four foot box loop - Plans to build a three or four foot box loop for the AM broadcast band, will tune from 530 to 1710 kHz.

Crossed-Wire HF Antenna - This Crossed-Wire Electrically-Steerable HF Antenna, capable of transmitting signals over the entire 1.8 to 30MHz HF range, and capable of receiving signals at much lower frequencies is basically a crossed centre-fed wire system, consisting of four thin wires brought to a central mast by G3YNH

160/80m Coaxial Receiving Loop Antennas  ^pop - Receiving loop antenna for top band. This antenna allow to reduce noise on both bands. The stand alone 80m loop is approximately four feet in diameter. And made of light weight material. Which makes it ideal for portable use or you can mount it above a pre-existing vhf antenna, and due to it's small size it is quite rotatable.

GenLog - Freeware Win98/NT/XP contest logging program, supports over 270 contests, Grid Square distance/heading routines, plus Grid maps by Dave Mascaro W3KM

Thames Valley Repeater Group - Thames valley repeater group homepage. information about the group, its activities and its four amatuer radio repeaters in the thames valley area

Grey Line Map - Earth view, with satellite data provided by The Living Earth.

AMT.ORG - W6AMT and W6EME, Meteor Scatter,Grid square maps!, online clock tune-up, or, useful and tested downloads

T.G.M. Communications - MQ-1 four band HF beams 20,15,10,6 meters MQ-2 six band HF beams 20,17,15,12,10,6 meters, beam antennas and Hybrid Quad antennas

Grid Locator and Grid Square - About grid locators and grid squares, includes links to locator and grid square calculators

JF9EXF Ham Maps Priority listing - Interactive maps for WAC continents, CQ zones, ITU zones & regions, Grid squares, Beam map & Japan districts

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

Grid Square maps  ^pop - Maps donated by Jack Bruce WA5UUD

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

F4DAY technical website - ATV and high speed data signalling projects

CQ TV - British Amateur Television Club CQ-TV on-line magazine, it publishes articles on amateur television and related topics four times a year.

PIC Microcontroller Books from Square 1 - "Learn about PIC Microcontrollers from our Books ""Easy PIC'n"" and ""PIC'n Up The Pace"" See tables of contents for our books at our web site."

WSJT High Speed Meteorscatter - "Software uses four-tone frequency-shift keying for meteor scatter. WSJT stands for ""Weak Signal communications, by K1JT"", and plans call for the program to include more than one communication mode."

GcmWin : Great Circle Map  ^pop - GCM is a freeware great circle map plotting software for windows, you can choose colours, scale, meridians, fields and or squares from the maidenhead locator system.

Grid Loc - calculate maidenhead grid square and coordinates

GridX - GRIDX, a BASIC program that calculates grid squares and Great Circle headings and grid.exe, a grid locator calculator

Squares - Grid Square and Distance calculator by w3km

Qgrid - Maidenhead grid squares calculator, and bearing and distance program

Eurowinlog - Eurowinlog is a ham logging software using worldmap zoomable capabilities. Handling 32400 gridsquares, dxcc, dxcluster, qsl printing and much more.

MacGPS Pro - Mapping software which links a Garmin GPS receiver to your Macintosh. Includes Maidenhead grid squares and beam-pointing maps.

DSP-10 2-meter DSP transceiver - The DSP-10 is an amateur-radio, software-defined 2-meter transceiver that can be built at home. It operates not only on SSB, FM and CW, but also on four Weak-Signal modes. Features are tailored to operation on VHF, UHF and Microwave frequencies. By W7PUA