grid sq maps

Half-Square antennas - This doubet antenna is a half wave dipole antenna easy to build, in french

Multi-Band Super Mini Loop Antenna  ^pop - How to make the Super antenna. To build this antenna you need a lot that is at least 100 feet across. Antenna covers all bands 80-10 meters + 30, 17, 12 meter WARC Bands This antenna works as a Full Wave Loop on 80 Meters and also works as a 2 wavelength open loop or Bi-Square on the 40 Meter band

80 Meter Pizza Pan Antenna - This is a resonant, half-wave, vertical antenna. It takes up little space in the back yard, was designed for operation on a single frequency 80 meter PSK net, and is reasonably inexpensive to construct by Chuck Hines, K6QKL

4Z5NY Antenn calculators - The formulas for a dipole and vertical, j-pole, double square, Yagi and EH antenna calculators

W1TAG LF Receiving Loop - The loop is square, 6 feet on a side.

Receive 4 square antenna - N6RK receive 4 square antenna with transformer coupled antennas and true hibrid combiner

The Half Square vs the Loop Skywire - by Jim Stafford, W4QO appeared in QRP Quarterly, Fall, 2006

The Square Vee antenna - KJ5TF square vee wire antenna

Build a 10 Meter Beacon - How to build a beacon keyer by Tom Sevart N2UHC

N9YDZ Beacon - N9ydz beacon brighton, illinois, grid square em48 on 28.210 Mhz

YV Venezuela Callsign Search - Online YV and YY Callsign search.

LU9DA DX Cluster maps - Display maps of current dx spots per each band

Irish Lighthouses - lighthouses and lightships of ireland and northern ireland with arlhs reference numbers for all irish lights

wb4bcr Receive 4 Square Control Unit - Build a Receive 4 Square Array! Make your own 160 meter 4 square receive antenna.

DK9SQ Antennen - Walter Spieth Antennen offer, Duoband-Portable-Log. Periodic 2m/70cm, Vertical-Loop-Antenna,10-40 Meter and PortableW3DZZ-Antenna as well as fiberglass tubes

Rescue Technology - Selection of technical rope rescue equipment for high angle, confined space, industrial, and water rescue

WorkedGrids - WorkedGrids is a Windows application that displays a map showing the amateur radio grid squares contacted and logged in using a third-party logging program. WorkedGrids uses colors to display information on a per-band basis. Up to four bands can be displayed concurrently by VE2ZAZ Bert

QTH locator or Map square with Google Maps - Based on Google Maps displays corresponding QTH grid square or helps to find one by pointing on the map.

Google and APRS - N6BG site using google maps api to show APRS data

SkyQuest New England Balloon Project

NVIS Propagation maps - Maps and propagation indices

USAPhotoMaps - Free Windows APRS Client with capability of downloading free aerial photo and topo map data.

DXFile - Windows shareware logging program, offer several features like packet radio interface, web cluster, grid square, beaming directions, qsl manager lookup, dx spot filtering by F6GQK in french.

FA Palm - Grid Square - Grid Square for Palm OS calculates the Maidenhead Grid Square for a given latitude and longitude.

Power Gride Tubes - Article on tubes and their usage in power amplifiers design. Explain failures of tube in RF power amplifiers, a common problem in the SB-220 SB-221, TL-922 and other amplifiers.